Goodwe Em Series Hybrid Inverter User Manual

EM SERIES USER MANUAL
HYBRID INVERTER
Rev.1.1
2021-01-08

https://www.semsportal.com/home/pvmaster	https://www.semsportal.com/home/AppDownload
https://www.linkedin.com/company/jiangsu-goodwe-power-supply-technology-co-ltd-/	http://en.goodwe.com

JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO.,LTD
No. 90 Zijin Rd., New District, Suzhou, 215011, China
www.goodwe.com
[email protected]

INTRODUCTION

The Good We EM series of hybrid/bidirectional solar inverters are designed for use in solar systems that integrate a photovoltaic system (PV), batteries, loads and the local grid for energy management. The energy produced by the PV system is used to optimize system self-consumption. Excess power is used for battery charging, and any remaining power can be exported to the grid. The battery can discharge to support loads when PV power is insufficient to meet self-consumption demands. If both PV power and battery power are insufficient, the system will draw power from the grid to support connected loads.

Note:
The introduction describes the general behavior of the EM system. The operating mode can be adjusted via the PV Master app according to the system’s layout. The diagram below shows the EM system’s general operating modes.

OPERATING MODES INTRODUCTION
The EM system will typically operate in one of the following modes, based on the configuration and layout of your system.

Mode Ⅰ
The energy produced by the PV system is used to optimize self-consumption. Excess energy is used for battery charging. Any remaining excess energy is exported to the grid.
Mode Ⅱ
When there is no PV present, and the battery has insufficient change, the EM system will supply the load using grid power.
Mode Ⅲ
If the grid fails, the system automatically switches to backup mode, in which the load can be supplied by the PV or battery.
Mode Ⅳ
The battery can be charged using grid power, with charge time/power-adjustable via the PV Master app.

Safety & Warnings

The EM series of inverters from Jiangsu GoodWe Power Supply Technology Co., Ltd. (also referred to as Goodwe) strictly complies with relevant safety rules for product  esign and testing. Please read and adhere to all the instructions and warnings on the inverter and in the user manual during installation, operation, and maintenance. Improper use could cause personal injury or damage to property.
Explanation of Symbols

	Caution! Failure to observe the warning notices in this manual may result in injury.
	The danger of high voltage and electric shock!
	The danger of a hot surface!
	Components in the product can be recycled.
	This side up! The package must be transported, handled, and stored such that the arrows always point upwards.
	No more than six (6) identical packages to be stacked on top of each other.
	Products should not be disposed of as household waste.
	Fragile – The package/product should be handled carefully and never tipped over or thrown.
	Refer to the operating instructions.
	Keep dry! The package/product must be protected from excessive humidity and must be stored undercover.
	You must wait at least 5 minutes after disconnecting the inverter from the utility grid and from the PV before touching any live internal parts.
	CE mark

Safety Warning
Installation and maintenance of the inverter must be performed by qualified electricians, in compliance with the local authority and grid company standards, wiring rules, and requirements (e.g., AS 4777 and AS/NZS 3000 in Australia).
Before installing any wiring connection or electrically operating the inverter, all battery and AC power sources must be disconnected from the inverter for at least 5 minutes to ensure the inverter is totally isolated to avoid electric shock.
The inverter’s surface temperature may exceed 60℃ during operation, so please ensure it has cooled down before touching it, and ensure the inverter is out of reach of children.
Opening the inverter’s cover or modifying any components without the manufacturer’s authorization will invalidate the product’s warranty.
The inverter must be operated in accordance with the instructions in this user manual; failure to do so may result in damage to the product and will invalidate the manufacturer’s warranty.
Appropriate methods must be adopted to protect the inverter from static damage. Any damage caused by static is not covered by the manufacturer’s warranty.
PV negative (PV-) and battery negative (BAT-) connections on the side of the inverter are not grounded by design. Connecting PV- to earth is strictly forbidden.
PV modules used with the inverter must have an IEC61730 class A rating, and the total open-circuit voltage of the PV string/array must be lower than the maximum rated DC input voltage of the inverter. Any damage caused by PV over-voltage is not covered by the manufacturer’s warranty.
The inverter’s built-in residual-current monitoring unit (RCMU) removes DC residual current above 6mA, so an external RCD (type A) can be used with the system (≥30mA).
In Australia, the inverter’s internal switching does not maintain neutral integrity. This must be addressed with an appropriate external connection configuration, such as that provided in the system connection diagram for Australia on page 20.
In Australia, the output from the backup side in the switch box should be labeled “Main Switch UPS Supply”. The output from the normal load side in the switch box should be labeled “Main Switch Inverter Supply”.

Product Overview

INSTALLATION INSTRUCTIONS

Incorrect Installation

Please avoid the following installation errors, which will damage the system or the inverter.

Packing List

Upon receiving the hybrid inverter, please check to ensure none of the components shown below are missing or damaged.

Mounting

Selecting a Mounting Location

For the protection and convenient maintenance of the inverter, the mounting location should be selected carefully based on the following rules:
No part of the system should block the switch or breaker that disconnects the inverter from DC and AC power.
Rule 1. The inverter should be installed on a solid surface, suitable for the inverter’s dimensions and weight.
Rule 2. The inverter should be installed vertically or at an angle not exceeding 15°.

Rule 3. The ambient temperature must be lower than 45°C.
(High ambient temperature will cause the inverter’s power to be derated.)
Rule 4. The inverter’s installation site should be undercover and protected from direct sunlight and poor weather conditions such as snow, rain, lightning etc.

Rule 5. The inverter should be installed at eye level for convenient maintenance.
Rule 6. The product label on the inverter should be clearly visible after installation.
Rule 7. Leave enough space around the inverter, as shown in the figure below.

The inverter must not be installed near flammable or explosive substances or strong electromagnetic equipment.

Mounting

Remember that this inverter is heavy! Please be careful when removing it from the packaging.
The inverter is suitable for mounting on concrete or other non-combustible surfaces only.
Step 1
Please use the supplied mounting bracket as a template to drill 4 correctly positioned holes (10 mm in diameter, and 80 mm in depth).
Use the expansion bolts in the accessory box to fix the mounting bracket securely onto the wall.
Note: The load-bearing capacity of the wall must be greater than 17kg; otherwise it may not be able to support the inverter.
Step 2
Carry the inverter by holding the heatsink on two sides and placing the inverter on the mounting bracket.

Step 3
The ground cable should be connected to the ground plate on the grid side.

Step 4
If required, the inverter can be locked to prevent theft.

Electrical Wiring Connection

PV Wiring Connection

Before connecting PV panels/strings to the inverter, please make sure the following requirements are met:

• The total short-circuits current of a PV string must not exceed the inverter’s max DC current.
• The PV string’s minimum isolation resistance to the ground must exceed 18.33kΩ to prevent the risk of shock.
• The PV string must not be connected to an earth/grounding conductor.
• Use the correct PV plugs supplied in the accessory box. (BAT plugs are similar to PV plugs. Please confirm you have chosen the correct plugs.)

Note: MC4 or QC4.10 or Amphenol plugs are included in the accessory box. Instructions for connecting these are provided below:

Step 1
Prepare the PV cables and PV plugs.

Note:

1. Please use the PV plugs and connectors supplied in the accessory box.
2. PV cable should be standard 2.5‒4mm 2

Step 2
Connect the PV cables to the PV connectors.

MC4 / QC4.10 Series	AMPHENOL Series

Note:

1. PV cables must be tightly crimped into the connectors.
2. For Amphenol connectors, the limit buckle must not be pressed.
3. There will be an audible click when the connector is correctly inserted into the PV plug.

Step 3
Screw on the cap and plug it into the side of the inverter.
Note: There will be an audible click when the connector is correctly inserted into the PV plug.

PV string polarity must not be reversed during connection, to prevent damage to the inverter.

Battery Wiring Connection

Please take care to avoid the risk of electric shock or chemical hazards.
Make sure there is an external DC breaker (≥63A) connected to batteries without a built-in DC breaker.
Ensure the breaker is off and the battery’s nominal voltage meets EM series specifications before connecting the battery to the inverter. Ensure the inverter is fully isolated from PV and AC power.
The capacity of a lithium battery (pack) must be 50Ah or larger. Battery cabling requirements are as per Figure 2.4.2-1.

Battery wiring connection process
Step 1
Prepare battery cables and accessories and insert the battery power cable into the battery cover.

Note:

1. Please use the accessories supplied in the accessory box.
2. The battery power cable should be 20‒35mm².

Step 2

Prepare the battery terminals

• Strip the cable sleeve to expose 10mm of the metal core.
• Use an appropriate crimping tool to tightly compress the battery terminal onto the exposed metal core.

Step 3
Connect the battery terminal to the inverter.
Note:
Please make sure the battery’s polarity (+/-) is not reversed.

* To connect compatible lithium batteries (LG / PYLON / BYD / GCL / DYNESS / ALPHA), please refer to the battery connection information in the EM Quick Installation Instructions.

Battery Protection
The battery will act as a protective charge/discharge current limiter under any of the conditions as below:

• Battery SOC (state of charge) is lower than I-DOD (depth of discharge).
• Battery voltage is lower than the discharge voltage.
• Battery overheating protection.
• Battery communication is abnormal for a lithium battery.
• Battery management system (BMS) limitation for a lithium battery.

When charge/discharge current limit protection occurs:

• In on-grid mode, battery charge/discharge operation may be abnormal.
• In off-grid mode, the backup supply will shut down.

Note:
• In off-grid mode, if the backup supply shuts down because of the battery having low SOC or voltage, all PV power will be used to charge the battery until its SOC reaches 40% +(1-DOD)/2, then the back-up supply will be activated.
• In on-grid mode, the battery is protected from over-discharge by DOD and the discharge voltage. In off-grid mode, it is protected only by the discharge voltage as a priority.
• The battery’s DOD setting prevents the inverter from discharging the battery’s reserve power. As soon as the DOD limit is reached, the load will only be supplied by either PV power or the grid. After several continuous days in which little or no battery charging occurs, the battery may continue to self-consume energy to support communication with the inverter. Behavior varies between batteries from different manufacturers, but if the battery’s SOC reaches a certain level, the inverter will boost the SOC back up. This protection mechanism safeguards against the battery reaching 0% SOC.

On-grid and Back-up Connection

An external AC breaker is required for an on-grid connection to isolate the system from the grid when necessary.
Requirements for the on-grid AC breaker are shown below.

Note: The absence of an AC breaker on the backup side will result in damage to the inverter in the event of a backup side electrical short-circuit. The backup function cannot turn off during on-grid operation.

1. Use a separate AC breaker for each individual inverter.
   
2. On the AC side, the individual breaker should be connected between the inverter and the grid, and before the load.
   

The procedure for on-grid and backup connection is shown below:
Make sure the inverter is fully isolated from any DC or AC power before connecting the AC cable.
Note:

1. The neutral cable should be blue, the line cable should be black or brown (preferred) and the protective earth cable should be yellow-green.
2. For AC cabling, the PE cable should be longer than the neutral and line cables, such that if the AC cable slips or is pulled out, the protective earth conductor will be the last to remain in place and support any strain.

Step 1-1 On-Grid
Prepare the terminals and AC cables according to the information in the appropriate table.

Step 1-2 Back-Up
Prepare the terminals and AC cables according to the information in the appropriate table.

Note: If not using on-grid power or the backup function to charge the battery, wire with a conductive core of 4‒6mm² can be used.

Step 2

1. Prepare the terminals and AC cables.
2. Insert the AC cable into the terminal cover and screw the three cables tightly onto the connectors.

Note：

1. Please use the terminals supplied in the components box;
2. Make sure the cable sleeve is not trapped with the conductor.

Step 3

Lock the terminal cover and fasten the terminal cap.
Note: Make sure the terminal cover is correctly locked onto the terminal.

Step 4-1 On-Grid
Connect the assembled AC terminals onto the inverter.
Note: Make sure the terminals are connected to the ‘On-Grid’ side (the other side is connected to the public grid).
Step 4-2 Back-Up
Connect the assembled AC terminals to the inverter.
Note: Make sure the terminals are connected to the ‘Back-Up’ side (the other side is connected to the public grid).

Adjustable Settings
The inverter includes an interface in which the user can set functions, such as trip points, trip time, time of reconnection, active and invalid QU curve and PU curve values etc. using special firmware. Please contact after-sales support to obtain the firmware and details of the adjustment method.

Adjustable Settings
The inverter includes an interface in which the user can set functions, such as trip points, trip time, time of reconnection, active and invalid QU curve and PU curve values etc. using special firmware. Please contact after-sales support to obtain the firmware and details of the adjustment method.
Connection for a SPLIT Grid System
There is a solution to enable the inverter to work in an on-grid mode in a SPLIT grid system. For details, please check the official application instructions on our website: GoodWe Hybrid Solution For Split Grid Type.

Declaration for Back-Up Function
EM series hybrid inverter backup outputs have overload functionality.
For details please refer to the technical parameters section (Page 31).
The inverter will derate for self-protection at high ambient temperatures.
The statement below sets out the general policies governing energy storage inverters of series EH, EM, ES, ET, BH, BT and SBP.

1. For Hybrid inverters (Series EH, EM, ES, and ET), a standard PV installation typically includes the inverter, PV panels and a battery. If the system is not connected to a battery, it is strongly recommended not to use the backup function. The manufacturer will not be liable for any consequences arising from the user’s failure to follow this instruction, and the standard warranty will be invalidated.
2. Under normal circumstances, the backup switching time is less than 10ms (the minimum requirement for a UPS). However, external factors may cause the system to fail in backup mode. As such, we recommend that users be aware of such conditions and follow the instructions below:

• Do not connect loads that are dependent on a stable energy supply for reliable operation.
• Do not connect a total load that exceeds the maximum backup capacity.
• Try to avoid loads that may create very high start-up current surges, such as inverters, air-conditioners and high-power pumps.
• Depending on the state of the battery itself, battery current may be limited by factors including but not limited to temperature and weather conditions.

Accepted Loads:

The EM series inverter is able to supply a continuous 2300VA output or max 3500VA in less than 10 seconds on the back-up side to support back-up loads. The inverter will derate for self-protection at high ambient temperatures.

• Acceptable backup loads: Television, computer, fridge, fan, illumination lamps, microwave oven, electrical rice cooker and router etc.
• Unacceptable back-up loads: Air conditioner, water pump, heaters, washing machine, electromagnetic oven, compression engine, hair drier and vacuum cleaner etc. Any other loads with high inrush current at start-up are also unacceptable.

Note:
For convenient maintenance, please install an SP3T switch on the backup side and the on-grid side. This enables adjustment of supply loads with backup, grid, or default  settings.

1. The backup load is supplied by the backup side.
2. The backup load is isolated.
3. The backup load is supplied from the grid side.

Declaration for Back-Up Overload Protection
The inverter will restart if overload protection is triggered. Preparation time for restarting will increase in duration (one hour at most) if overload protection is triggered repeatedly. Take the
following steps to restart the inverter immediately:
Decrease backup load power to within maximum limits.
In the PV Master app → Advanced Setting → Click “Reset Back-Up Overload History”.

2.4.4 Smart Meter & CT Connection

Make sure the AC cable is fully isolated from AC power before connecting the Smart Meter & CT.
The Smart Meter with integral current transformer (CT) included with the product is compulsory for EM system installation. It is used to detect grid voltage, current direction and magnitude. It also communicates with the inverted RS485 communication.
Note:

1. The Smart Meter & CT is correctly configured. Please do not alter any settings on the Smart Meter.
2. Only one Smart Meter can be used for each EM series inverter.
3. Three CTs must be used for one Smart Meter and must be connected on the same phase with Smart Meter power cable.

Smart Meter & CT Connection Diagram

• For single-phase grid
  

Note:

1. Please use the Smart Meter with 3 CTs supplied with the product.
2. The CT cable is 3m as default, but can be extended to a maximum of 5m.
3. The Smart Meter communication cable (RJ45) is attached to the inverter (“To Smart Meter” cable). It can be extended to a maximum of 100m, and must use a standard  RJ45 cable and plug, as below:

Smart Meter LED Indications

Detailed Pinout for Each Port on the Inverter
BMS: CAN communication is configured by default. If RS485 communication is to be used, please contact after-sales support to obtain the correct communication cable.

DRED and Remote Shutdown Device Connection
A DRED (demand response enabling device) is required for installation in Australia and New Zealand (and can also be used for remote shutdown in European countries), in compliance with Australia and New Zealand safety requirements (or those of European countries). The inverter includes the required control logic and DRED interface, but the  DRED itself is not provided by the inverter manufacturer.
Connection details for DRED and remote shutdown are shown below:

Step 1
Unscrew the plate from the inverter.
Note: DRED should be connected via the “DRED Port” as the figure shows.

Step 2

1. Unplug the 6-pin terminal and disconnect the resistor.
2. Remove the resistor and retain the 6-pin terminal for the next step.

Note: The 6-pin terminal in the inverter has the same pinout as the DRED. Please leave it in the inverter if no external device is connected.

Step 3-1 For DRED

1. Push the DRED cable through the plate.
2. Connect the DRED cable to the 6-pin terminal.
   The function of each position on the connector is shown below.

Step 3-2 For Remote Shutdown

1. Push the cable through the plate.
2. Wiring for connector positions 5 and 6, respectively.

Step 4
Connect the DRED terminal at the correct location on the inverter.

Earth Fault Alarm Connection
The EM series inverter complies with IEC 62109-2 13.9. The fault indicator LED on the inverter cover will light up and the system will email fault information to the customer.
The inverter should be installed at eye level for convenient maintenance.

SEMS Portal
SEMS Portal is an online monitoring system. After the installation of the communication connection is complete, you can access www.semsportal.com or download the app by  scanning the QR code to monitor your PV plant and device.
Please contact the after-sales team for more information on how to use SEMS Portal.

https://www.semsportal.com/home/AppDownload

Wiring Scheme for EM Series Hybrid Inverters

Note: This diagram illustrates the wiring scheme for the EM series hybrid inverter, not the electrical wiring standard.

Please select a breaker according to the specifications below

1. For batteries with attached breakers, the external DC breaker can be omitted.
2. Only for lithium batteries with BMS communication.
3. CT must not be connected in reverse. Please follow “House→Grid” instructions for the correct connection.

System Connection Diagrams

Note: In accordance with Australian safety regulations, the neutral cables of the on-grid side and the backup side must be connected together, otherwise the backup function will not work.

This diagram shows an example application where neutral is connected to PE in the distribution box.
Applies to: Australia, New Zealand, South Africa, etc. (Please follow local wiring regulations!)

This diagram shows an example configuration for grid systems without special requirements for electrical wiring connections.
Note: The backup PE line and earthing bar must be grounded properly and effectively.
Otherwise, the backup function may perform abnormally when the grid fails.

SYSTEM OPERATION

Wi-Fi Configuration
This section illustrates configuration via the web interface. You can also complete configuration using the PV Master app. Wi-Fi configuration is essential for online monitoring and maintenance.
Preparation:

1. The inverter must be powered up with a battery or grid power.
2. A router with internet access to the website www.semsportal.com is required.

Step 1

1. Connect Solar-WiFi* to your PC or smartphone (* Its name is the last 8 characters of the inverter’s serial number.).
2. Open a browser and log in at 10.10.100.253 Admin (User): admin; Password: admin.
3. Click “OK”.
   

Step 2

1. Click “Start Setup” to choose your router.
2. Click “Next”.

Step 3

1. Enter the password for the router, then click “Next”.
2. Click “Complete”.

Note:
If the Wi-Fi module fails to connect to the network after entering the correct password, the hotspot password may contain special characters not supported by the module. 

Note:

1. Please make sure the password and encryption method/algorithm are the same as the router’s.
2. If everything is ok, the Wi-Fi LED on the inverter will change from a pattern of two blinks to four blinks and then to a constant state, indicating successful Wi-Fi connection to the server.
3. Wi-Fi configuration can also be completed using the PV Master app. For details please see the PV Master app.

Wi-Fi Reset & Reload
Wi-Fi reset restarts the Wi-Fi module. Wi-Fi settings will be reprocessed and saved automatically.
Wi-Fi reload will restore the Wi-Fi module’s default factory settings.

Wi-Fi Reset
Short press reset button.
Wi-Fi LED will blink for a few seconds.

Wi-Fi Reload
Long press reset button (longer than 3s).
Wi-Fi LED will double blink until Wi-Fi is configured again.

Note:
Wi-Fi reset & reload functions should only be used when:

1. Wi-Fi loses connection to the internet or cannot connect to the PV Master app successfully.
2. The “Solar-WiFi signal” cannot be detected, or you have other Wi-Fi configuration problems.

PV Master App
PV Master is an external monitoring/configuration application for hybrid inverters. It can be used on Android and iOS smartphones and tablets. Its main functions are as  described below:

1. Edit the system configuration to operate as required by the customer.
2. Monitor and check the performance of the hybrid system.
3. Wi-Fi configuration.

Please download the PV Master app from the Google Play Store or Apple App Store. You can also download the app by scanning the QR code on the back of this user manual.
Please download “PV Master Operation Instructions” from www.goodwe.com

CEI Auto-Test Function
A PV auto-test function for CEI is included in the PV Master app to meet Italy’s requirements. For detailed instruction for this function please refer to “PV Master Operation  Instructions”.

OTHERS

Error Messages
The error messages below will be displayed on the PV Master app or reported by e-mail if an error occurs.

Troubleshooting

Checks Before Turning On AC Power

• Battery Connection: Check the connection between the EM inverter and the battery: Polarities (+/-) must not be reversed (refer to figure 4.2-1).
• PV Input Connection: Check the connection between the EM inverter and PV panels: Polarities (+/-) must not be reversed (refer to figure 4.2-2).
• On-Grid and Back-Up Connection: Check the on-grid connection to the power grid, and the back-up connection to the loads: Polarities (L1/L2/L3/N should be in sequence) must not be reversed (refer to figure 4.2-3).
• Smart Meter and CT Connection: Ensure the Smart Meter and CT are connected between the house loads and grid and match the Smart Meter direction markings on the  CT (refer to figure 4.2-4).

Checks When Starting the EM and Turning On AC Power
Battery Settings, BMS Communication and Safety Country:
After connecting Solar-WiFi* (*The name of the Wi-Fi connection is the last 8 characters of the inverter’s serial number), check “Param” settings in the PV Master app to ensure the battery type selected matches the battery installed and that the “Safety Country ” Setting is correct. Please change these settings in “Set” if they are not correct.

Note: For compatible lithium batteries, BMS status will display “Normal” after selecting the correct battery manufacturer.

Problems During Operation

Inverter does not start up with battery only
Solution:
Ensure the battery voltage is greater than 48V, otherwise, the battery will be unable to start the EM inverter.

Inverter is not started up with PV only
Solution:

1. Ensure the PV voltage is greater than 125V (200V is required to enter on-grid mode).
2. Check the connection between EM and PV panels: Polarities (+/-) must not be reversed.

The inverter doesn’t discharge or output without PV or when PV is lower than load power
Solution:

1. Check that the EM inverter and Smart Meter are able to communicate.
2. Ensure load power is higher than 150W.
   a. The battery will not discharge continuously unless load power is greater than 150W.
   b. If the battery does not discharge when meter power is greater than 150W, please check the Smart Meter & CT connection and polarity.
3. Make sure SOC (state of discharge) is higher than 1-DOD (depth of discharge). If the battery discharges to below 1-DOD, it will only discharge again when SOC is charged to (20%+1-DOD) /2 and SOC＞105% -DOD. (If immediate battery discharge is required,  the user should restart the battery.)
4. Use the app to check whether the charge time has been set already since the battery cannot discharge whilst charging. (The battery will prioritize charging when charge/discharge times coincide).

Battery does not charge when PV power is greater than load power
Solution：

1. Check the discharge time setting on the app.
2. Check whether the battery is fully charged and the battery voltage reaches “charge voltage”.

High power fluctuation during battery charge or discharge
Solution：

1. Check whether there is a fluctuation in load power.
2. Check whether there is a fluctuation in PV power.

Battery does not charge:
Solution:

1. Ensure BMS communication is OK using the PV Master app (for lithium batteries).
2. Check that the CT is connected in the correct position and direction, as per chapter 2.4.4: Smart Meter & CT Connection.
3. Check whether the total load power is much greater than PV power.

Questions & Answers (Q & A)

Wi-Fi Configuration
Q: Why can’t I find the Solar-WiFi* signal on mobile devices?
A: Normally the Solar-WiFi* signal can be detected immediately after powering up the inverter.
However, the Solar-WiFi signal will disappear when the EM unit connects to the internet. If you need to change settings, connect via the router instead. If you can’t find the Wi- Fi signal or connect to the router, please try to reload the Wi-Fi settings (refer to 3.1 Wi-Fi Configuration).

Q: Why can’t I connect to the Solar-WiFi* signal on my phone?
A: The Wi-Fi module can only connect to one device at a time. If the signal is already connected to another device, you will be unable to connect to it using your phone.

Q: Why does the Wi-Fi module fail to connect to the network after I select the correct router hotspot and enter the right passwords?
A: It’s possible that your hotspot password contains special characters not supported by the module. Please modify your password to include only Arabic numerals and or  uppercase/lowercase letters.

Battery Operation
Q: Why does the battery not discharge when the grid is not available, while it discharges normally when grid is available?
A: On the app, the off-grid output and back-up functions must be enabled for the battery to
discharge in off-grid mode.

Q: Why is there no output on the backup side?

A: To enable the backup supply, “Back-Up Supply” on the PV Master app must be turned on. In off-grid mode or when grid power is disconnected, the “Off-Grid Output  Switch” function must also be turned on.
Note: When enabling the “Off-Grid Output Switch” function, don’t restart the inverter or battery, otherwise the function will be switched off automatically.

Q: With lithium batteries, why does the battery switch always trip when it is started up?
A: The lithium battery switch will normally trip for the following reasons:

1. BMS communication fails.
2. Battery SOC is too low, and the battery trips to protect itself.
3. An electrical short-circuit occurred on the battery connection side. There may be other reasons. Please contact after-sales support for further information.

Q: Which battery should I use with the EM series inverter?
A: Lithium batteries compatibility with EM series inverters, and with a nominal voltage of 48V can be used. For compatible lithium batteries please refer to the battery list in the PV Master app.

PV Master Operation and Monitoring
Q: Why can’t I save settings in the PV Master app?
A: This could be caused by loss of connection to the Solar-WiFi * signal.

1. Ensure you have already connected to Solar-WiFi* directly (if no other devices are connected)
   or via the router (if you have connected Solar-WiFi* to your router). The app’s homepage
   should display if the connection is working.
2. Make sure you restart the inverter 10 minutes after changing settings, since the inverter will
   save settings every 10 minutes during normal operation. We recommend changing settings
   when inverter is in standby mode.

Q: Why is the information displayed on the homepage different from that on the param page, for e.g., parameters such as charge/discharge, PV value, load value or grid value?
A: The data refresh frequency varies, so there may be inconsistencies between information displayed on different pages in the app, as well as between the portal and the app.

Q: Some columns (e.g. battery SOH) display NA. Why does this happen?
A: NA indicates that the app has not received data from the inverter or server due to a communication problem e.g., with battery communication or communication between  the inverter and the app.

About Smart Meter and Power Limit Function
Q: How do I activate the output power limit function?
A: In an EM system, this function can be implemented as follows:

1. Ensure the Smart Meter is connected and communicating properly.
2. Turn on the export power limit function and set the max output power to grid in the app.

Note: Even if the output power limit is set to 0W, there may still be a deviation of max 100W when exporting to the grid.

Q: Why is power still being exported to the grid after I set the power limit to 0W?
A: The export limit can be 0W in theory, but this may deviate by around 50-100W in an EM system.

Q: Can I replace the Smart Meter supplied with the EM system with another brand of a meter or change some of the settings in the Smart Meter?
A: No. The inverter and Smart Meter use a dedicated communications protocol that is not supported by other brands of meters. Additionally, manually changing the meter’s settings could cause a communication failure.

Q: What is the maximum current allowed through the CT on the Smart Meter?
A: The max current for the CT is 120A.

Other Questions
Q: Is there a quick way to get the system working?
A: For the shortest setup, please refer to the “EM Quick Installation Instructions” and “PV Master App Instruction”.

Q: What kind of load can connect to the backup side?
A: Please refer to section 2.4.3 On-Grid & Back-Up Connection: Declaration for Back-Up Overload Protection

Q: Will the inverter’s warranty of the inverter still be valid if, for some particular reason, we cannot completely follow the instructions in the user manual for installation or operation? 
A: Normally we would still provide technical support for problems caused by failing to adhere to the instructions in the user manual. However, we cannot guarantee to provide replacements or accept returns. Therefore, if there are particular reasons why you cannot fully comply with the instructions, please contact the after-sales team for advice in the first instance.

Disclaimer

EM series inverters must be transported, installed and operated under specified environmental and electrical conditions. The manufacturer has the right not to provide after-sales services or assistance under the following conditions:

• The inverter is damaged during transportation.
• The inverter is outside its one-year warranty and an extended warranty was not
• The inverter has been installed, refitted or operated improperly, without the manufacturer’s prior
• The inverter has been installed or operated under improper environmental or technical conditions, as described in this user manual, without the manufacturer’s prior consent.
• The requirements described in this manual were not adhered to during installation or configura­tion of the inverter.
• The inverter has been installed or operated contrary to the requirements or warnings provided in this user manual.
• The inverter is broken or damaged by any force majeure e.g., lightning, earthquake, fire hazard, storm, or volcanic eruption.
• The inverter’s hardware or software has been disassembled, modified, or updated in any way without the manufacturer’s prior consent.
• The inverter has been installed or operated contrary to any relevant international or local policies or regulations.
• Any non-compatible batteries, loads of other devices have been connected to the EM system.

Note: 
The manufacturer retains the right to explain all the contents in this user manual. To ensure IP65 rating compliance, the inverter must be well sealed: Please install the inverter within one day of unpacking; otherwise please seal all unused terminals/holes such that there is no risk of water or dust ingress.

Maintenance
The inverter requires periodical maintenance. Details are provided below:

• Ensure the inverter is fully isolated from all DC and AC power for at least 5 minutes before starting any maintenance work.
• Heat sink: Please use a clean towel to clean up the heat sink once a year.
• Torque: Please use a torque wrench to tighten AC and DC wiring connections once a year.
• DC breaker: Check the DC breaker regularly, and activate it 10 times in a row once a year.
• Operating the DC breaker will clean its contacts and extend its lifespan.
• Waterproof plate: Replace the waterproof plate of the RS485 connector and other parts once a year.

Technical Parameters

1. Actual charge and discharge currents also depend on the battery.
2. In off-grid mode, battery capacity should be greater than 100Ah.
3. Maximum operating DC voltage is 530V.
4. When there is no battery connected, the inverter only starts feeding in if the string voltage exceeds 200V.
5. 4600 for VDE0126-1-1&VDE-AR-N4105 & CEI 0-21 (GW5048-EM).
   

   Technical Data	GW3048D-EM	GW3648D-EM	GW5048D-EM
   AC Output Data (Back-up)
   Max. Output Apparent Power (VA)	2300	2300	2300
   Peak Output Apparent Power (VA)*8	3500, 10 sec	3500, 10 sec	3500, 10 sec
   Automatic Switch Time (ms)	10	10	10
   Nominal Output Voltage (V)	230 (±2%)	230 (±2%)	230 (±2%)
   Nominal Output Frequency (Hz)	50/60 (±0.2%)	50/60 (±0.2%)	50/60 (±0.2%)
   Max. Output Current (A)	10	10	10
   Output THDv (@Linear Load)	<3%	<3%	<3%
   Efficiency
   Max. Efficiency	97.6%	97.6%	97.6%
   Max. Battery to Load Efficiency	94.5%	94.5%	94.5%
   Europe Efficiency	97.0%	97.0%	97.0%
   MPPT Efficiency	99.9%	99.9%	99.9%
   Protection	.
   Anti-islanding Protection	Integrated
   PV String Input Reverse Polarity Protection	Integrated
   Insulation Resistor Detection                                                   Integrated
   Residual Current Monitoring Unit	Integrated
   Output Over Current Protection	Integrated
   Output Short-circuit Protection	Integrated
   Output Over-Voltage Protection	Integrated
   General Data
   Operation Temperature Range (℃)	-25~60	-25~60	-25~60
   Relative Humidity	0~95%	0~95%	0~95%
   Operating Altitude (m)	4000	4000	4000
   Cooling	Nature Convection	Nature Convection	Nature Convection
   Noise (dB)	<25	<25	<25
   User Interface	LED & APP	LED & APP	LED & APP
   Communication with BMS [9]	RS485; CAN	RS485; CAN	RS485; CAN
   Communication with Meter	RS485	RS485	RS485
   Communication with Portal	Wi-Fi	Wi-Fi	Wi-Fi
   Weight (kg)	16	17	17
   Size (Width*Height*Depth mm)	347*432*175	347*432*175	347*432*175
   Mounting	Wall Bracket	Wall Bracket	Wall Bracket
   Protection Degree	IP65	IP65	IP65
   Standby Self-consumption (W)	<13	<13	<13
   Topology	Battery Isolation	Battery Isolation	Battery Isolation

6.  For CEI 0-21 GW3048-EM is 3300,GW3648-EM is 4050,GW5048-EM is 5100;for VDE-AR-N4105 GW5048-EM is 4600.
7. 21.7A for AS4777.2.
   

   Technical Data	GW3048D-EM	GW3648D-EM	GW5048D-EM
   Certifications and Standards [10]
   Grid Regulation	VDE-AR-N4105;	VDE-AR-N4105;	VDE-AR-N4105;
   	VDE 0126-1-1	VDE 0126-1-1	VDE 0126-1-1
   	EN 50549-1;G98,G100;	EN 50549-1;G98,G100;	EN 50549-1;G99,G100;
   	CEI 0-21;AS/NZS 4777.2	CEI 0-21;AS/NZS 4777.2	CEI 0-21;AS/NZS 4777.2
   	NRS 097-2-1	NRS 097-2-1	NRS 097-2-1
   Safety Regulation	IEC/EN62109-1&2,	IEC/EN62109-1&2,	IEC/EN62109-1&2,
   	IEC62040-1	IEC62040-1	IEC62040-1
   EMC	EN61000-6-1,	EN61000-6-1,	EN61000-6-1,
   	EN61000-6-2,	EN61000-6-2,	EN61000-6-2,
   	EN61000-6-3,	EN61000-6-3,	EN61000-6-3,
   	EN61000-6-4	EN61000-6-4	EN61000-6-4
   	EN 61000-4-16, EN	EN 61000-4-16, EN	EN 61000-4-16, EN
   	61000-4-18, EN	61000-4-18, EN	61000-4-18, EN
   	61000-4-29	61000-4-29	61000-4-29

8. Can be reached only if PV and battery power are sufficient.
9. CAN communication is configured by default. If RS485 communication is used, please replace the corresponding communication line.
10. Not all certifications and standards are listed. Please see the official website for further details.

Other Tests

For Australian requirements, in the THDi test, Zref should be added between inverter and mains.
RA, XA for Line conductor
RN, XN for Neutral conductor Zarif:
RA=0, 24; XA=j0,15 at 50Hz;
RN=0, 16; XN=j0,10 at 50Hz

Quick Check List to Avoid Danger

1. The inverter must not be installed near flammable or explosive materials or strong electromagnetic equipment. Please refer to 2.3.1 Select Mounting Location.
2. Remember that this inverter is heavy! Please be careful when removing it from the packaging.
   Please refer to 2.3.2 Mounting.
3. Ensure the battery breaker is off and the battery’s nominal voltage complies with EM series specifications before connecting the battery to the inverter, and ensure the  inverter is fully isolated from PV and AC power. Please refer to 2.4 Electrical Wiring Connection.
4. Ensure the inverter is fully isolated from DC and AC power before connecting the AC cable.
   Please refer to 2.4.3 On-Grid and Back-Up Connection.
5. Ensure the AC cable is fully isolated from AC power before connecting the Smart Meter & CT, please refer to 2.4.4 Smart Meter & CT Connection.

Appendix Protection Category Definition
Overvoltage category definition

Moisture Location Category Definition

Environment category definition

Pollution degree definition