12kPV - EG4 Community Forum

EG4_FAAB-2727 (Most Recent Firmware)

EG4 Eric — Mon, 06 Apr 2026 21:46:08 +0000

EG4_FAAB-2727

2026-03-29

Based on FAAB-2626/2525.
Match LCD V25.
1. Improved. New England Grid Profile — added regional grid profile support for New England configurations, with Voltage-Active mode disabled by default.
2. Improved. Added RS485 BUS communication support on the Meter485 port for PPL Electric installations.
3. Improved. LUMA Grid Profile: Voltage-Active Power mode enabled by default.
4. Improved. HECO Grid Profile: Frequency-Active Power mode enabled by default; under-excited reactive power set as default.
5. Improved. Optimized charging power limitations when PV power is unbalanced across inverters in a parallel system.
6. Improved. LCD phase setting labels updated from R/S/T to A/B, B/C, C/A （LCD V25）.
7. Improved. Update fan logic to start fans at a lower temperature to optimize heat dissipation.
8. Bug Fixes. Fixed repeated switching between on-grid and off-grid modes on the secondary inverter triggered by off-grid cut-off voltage in parallel shared-battery and lead-acid battery mode.
9. Bug Fixes. Reduced probability of repeated state switching between PVBatGridOn and PVChgGridOn.
10. Bug Fixes. Fixed the inability to exit on-grid AC couple charging state and switch to battery discharge when load exceeds AC couple power in a parallel system.

EG4_FAAB-2122 / 06-22-2025

EG4 Eric — Wed, 14 Jan 2026 15:48:30 +0000

EG4_FAAB-2122

2025-06-22

Based on FAAB-2021
1.Add Weekly Setting function.
2.Add the function of Sporadic AC charge power function, it will cause the AC charge power to fluctuate randomly between the set AC charging power and 2% rated power.
3.Optimize the response speed and stability in zero export mode in meter mode.
4.Optimize the restart logic that modify the CT/meter, battery type and brand will not be restarted.
5.Improve the issue of reading the RGM settings.
6.Improve the issue of power display on Micro-Grid mode.
7.Improve the issue of not stopping at the Stop Discharge Volt of forced discharge.
8.Improve the issue where the LCD display on the load power side lacked Smart Load power when the Micro Grid plus Smart Load mode were enabled.
9.Improve the issue of increased charge power when setting the Charge Last mode.
10.Improve the issue of abnormal load display in web page flow chart during parallel mode.
11.Improve the issue of getting phase lost warning when switching from on-grid and off-grid in three phase parallel mode.

EG4_FAAB-2525

EG4 Eric — Fri, 12 Dec 2025 17:35:02 +0000

EG4_FAAB-2525

2025-09-28

Firmware Changelog – FAAB-2525 （Based on FAAB-2122）
1.Added support for BASCO battery protocol （Battery Brand Setting 22）.
2.Added support for SunSpec Modbus IEEE-1547 certification.
3.Added support for N-PE bonding setting – enables closing the N-PE relay only in off-grid mode.
4.Added support for displaying EG4 battery model information.
5.Improved download time for subsequent firmware updates.
6.Enhanced encryption for firmware update packages.
7.Improved stability of remote LCD firmware updates.
8.Added ability to configure generator exercise cycles even when grid power is available （keeps generator in idle operation）.
9.Improved MPPT behavior.
10.Adjusted the Absorb Voltage and Float Voltage lower limit from 50 V → 48 V.
11.Expanded the setting range of Stop AC Charge SOC （%） to 0–101%.
12.Expanded the configurable range of grid protection parameters for 127/220 V grid type.
13.Fixed issue where LCD communication fault could occur when the FlexBOSS LCD screen kit backlight was off.
14.Improved LCD display for PV input arrow:
- Single unit: arrow displays when PV power >100 W
- Parallel system: arrow displays when total PV power >300 W
15.Fixed issue where consumption power was not displayed on monitoring line chart during off-grid or parallel operation.
16.Improved stability when switching between on-grid and off-grid modes if the battery discharges to the On-Grid Cut-Off SOC/Voltage while running with GridBOSS and set to Off-Grid mode.
17.Improved SOC control mode:
- If battery voltage drops below the off-grid cut-off voltage, the inverter will force charge the battery up to （cut-off voltage + 2 V）.
- Prevents over-discharge in cases where BMS SOC reporting is inaccurate.
18.When inverter is set to lead-acid battery mode or no battery mode, the active W04: Battery BMS Status Alarm will now be cleared automatically.

EG4_FAAB-2021

Jared — Wed, 12 Mar 2025 20:09:28 +0000

Same as fAAB-2021, change based on FAAB-1E1E.

1. Add the new startup option "Soc/Volt + Time" for AC charge startup. （Compatible with LCD V20）.
2. Add two-time settings to the generator startup setting.
3. Add AC couple on EPS port function to Flex Boss that paralleled with Grid Boss.
4. Optimize when either ‘charge control’ or ‘discharge control’ setting changes, the settings for both will be updated synchronously.
* synchronized Charge and Discharge. if a customer sets the charging control to SOC, the discharging control setting will automatically switch to SOC.
5. Changing the CT ratio on monitor site no longer requires a system restart.
6. Optimize the issues of flicker.
7. Optimize the standard voltage of BUS1 to 370V.
8. Optimize the communication fault logic when connecting to Grid Boss.
*it has been modified to alert when disconnecting the communication line when on-grid or off-grid
9. Optimize the issue of switching and EPS output interruption when PV is weak
10. Optimize DCDC operation to make it more stable.
11. Fix the parallel phase error issue when connecting generator in split phase parallel system.
LCD V20
1. Add the new startup option "Soc/Volt + Time" for AC charge startup.

EG4_EAAB-1E1E

Jared — Thu, 14 Nov 2024 15:04:35 +0000

2024-11-13

Same as eAAB-1E1E, changes based on the EAAB-1B1C and EAAB-1D1D. After updating, it cannot restore version of FAAB-1C1C and below.
1.Compatible with FlexBoss.
2.Support working with GridBoss.
3.Add Dark Start logic to disconnect the EPS load
by using the dry contact 2 to control external relay or contactor
when the battery SOC/Volt is very low and there is no grid available and allows the connected grid-tied inverter or generator to prioritize charging the battery to dart start the system.
4.Add WattNode RGM protocol, CT ratio and direction setting.
5.Add Dry contact reuse function for configuring RSD, Smart load, Darkstart and Non-critical Load.
6.Optimize the ability to take the half wave load.
7.Optimize remote update process.
8.Optimize the protection of model settings.
9.Optimize the update process without power loss for the single, parallel, GridBoss parallel system.
10.Optimize the charge and discharge current setting limit for parallel system.
11.Optimize the BUS1 issue when the battery voltage goes to 40V.
12.Optimize the operation of non-shared battery mode for GridBoss parallel system.
13.Optimize generator dry contact logic in parallel system. The master unit summarizes the status of each dry contact. If any dry contact meets the ON conditions, the system is set to work. If all unit meet the OFF conditions, the system will be set to stop.
14.Optimize the Lithium battery option 31 not being able to be set for 16 cell lithium battery without communication.
15.Optimize the issue that AC charge power cannot be reduced to 0 when the load exceeds the set generator rating power in parallel system with generator.
16.Optimize the frequency shift when AC couple power exceeding system requirements in single unit with GridBoss system.
17.Optimize the logic of Grid Always On function in smart load setting that,
keep the smart load working even if enable Off-Grid Mode as long as the grid exists.
18.Optimize the LCD power flow display of the parallel system to display the total system power and change the display of power unit from W to kW.
19.Optimize display of PV3 power on LCD.
20.Optimize the display of three-phase load power in parallel system.

EG4_EAAB-1B1C

Jared — Fri, 11 Oct 2024 19:10:46 +0000

2024-06-21

Change based on the FAAB-1A1A.
1.Fixed an issue when inverter in off-grid mode, inverter can't use generator to take load and charge battery.
2. Optimized the logic of on-grid load taking.

Previous Changes

Jared — Fri, 11 Oct 2024 19:09:40 +0000

EG4_EAAB-1A1A

2024-04-22

Same as fAAB-1A1A, changes based on the FAAB-1919.
1.Add 2 minutes of Warmup to the generator microgrid mode.
2. Add split phase voltage overvoltage and undervoltage protection for US models.
3. Improvement, keep off-grid state when countdown to connect to on-grid mode. At the end of the countdown, it will quickly switch from off grid to on-grid mode.
4. Improve load calculation in three-phase parallel and on-grid mode.
5. Fix the issue of using Grid AC to charge even when SOC/Volt reaches Stop AC Charge SOC/Volt when AC Couple and AC Charge are enabled.
6. Optimize AC Couple power display.
7. Fix the issue of the original AC Couple power not being able to reset to zero when the AC Couple is disconnected from the grid and there is no grid power.
8. Update PR-LUMA grid regulations parameters.
9. Update register information for "Permit Service".

EG4_EAAB-1919

2024-03-18

Changes based on the FAAB-1818
1.Corrected the sampling of NPE connection.
2. Logic optimization: When the battery SOC/Voltage is lower than "Start generator charge SOC/VOLT" limit, the dry contact turns on, and only when there is generator input, the inverter enters generator charge mode.
3. Optimized the control logic for the following scenario: When the PV power is sufficient, but grid sell back is not allowed and there is no load compensation requirement, once battery is fully charged, BUS over voltage issue happens.

EG4_EAAB-1818

2024-02-26

（Same as fAAB-1818）based on FAAB-1616 and FAAB-1717
1.New feature— Parallel Setting Data Sync, synchronize the settings of primary and subordinate inverters.
2.New feature— Gen Boost, which enables the PV and battery to work with the generator together when the generator power is insufficient to handle the load.
3.New feature— Battery Backup Mode. When enabled, the batteries will stay at the appointed SOC （default 100% SOC） unless there is no grid or grid abnormality or no generator port input.
4.New feature—N PE relay control
5.New feature—Gen overload alarm, if the generator power is greater than GenRatedPower+500w for 1 minute, an alarm prompt will appear.
6.Newly added—127/220V Grid Type. When set Grid Type to 120/208V, set EPS Voltage to 220V, the grid protection rules can be automatically adapted.
7.Newly added—Grid Peak-Shaving Power 2 kW, effective for corresponding time period 2.
8.Newly added—EPS overload recovery time is upload.
9.Newly added—Generator Cool-Down Time （Min） setting. After the generator is charged to the cut-off voltage, the inverter will not switch back to the generator for power supply unless it has not been shut down before exceeding the cooldown set time.
10.Improvment—Optimization of generator related logic. When manually starting the generator, as long as the GeneratorChargeEndSOC/Volt setting is not reached, it can still be charged. After stopping charging at GeneratorChargeEndSOC/Volt, there is a delay of 5 minutes for allowing to recharge to prevent repeated switching.
11. Improvement—Optimization of Quick charge. The inverter will automatically change its settings and use the AC charge function for the next one hour. After the charge is completed, the settings will be restored.
12. Improvement—The range of AC Couple Start/End Volt/SOC are enlarged.
13. Improvement—AC Couple can be used normally, when Micro grid enabled but generator is off.
14. Improvement—Adjust the range of lead-acid battery Ah settings from 50Ah to 5000Ah.The triggering current entering float charge mode can be changed （defaults to 0.01C）.
15. Improvement—Surge protection supports EPS output by1.35 times rated power for 1 minute.
16. Improvement—Balanced load during parallel and on-grid mode.
17. Change—The Share Battery function in the US version is enabled by default.
18. Problem fixing—Fixing the issue of generator cannot be able to shut down after being started up by Quick Gen start. Generator will be automatically shuts down after 20 minutes of startup.

EG4_EAAB-1717

2024-01-18

Changes log （Same as fAAB-1717）based on FAAB-1616
1. New feature: On-grid load balance and PV Sell for parallel system
2. New feature: Parallel settings synchronization
3. Flicker optimization: Voltage drop when heavy load start
4. Optimization for generator application, such as transfer time, warm up, cool down, exercise, and quick start&stop remotely.
5. Issue fixed: Generator End volt/SOC setting not work
6. Bug fixed: Cannot exit EPS mode when RSD active
7. Raise default value of start&stop volt/SOC for AC Couple, if PV inverter does not derate power at over frequency, customer can set lower value to disconnect it by generator relay
8. Enable Share Battery Function by default for US version

EG4_EAAB-1616

2023-10-20

Changes log （Same as fAAB-1616）based on FAAB-1312.
1. Optimization on frequency shifting for AC couple function has been done.
2. Optimization on Zero export function: Stop frequently switching between PV charge +Grid on and PV+Battery grid on modes.
3. 3phase （208Vac/120Vac）parallel solution has been supported: 2 *208V 3phase parallel and 3 *208V 3phase parallel are supported.
4. Optimization on EPS transfer time has been done.
5. RSD active signal to BMS has been added: Battery needs to support the respond to RSD demand too.
6. The setting range of Generator rated power has been changed to 255kW max and 1kW min.
7. Logics optimization: Once "Fast zero export " function is enabled, " Grid sell back " function won't take effect.
8. Refined parameter adjustments for Battery control: On-Grid cut off VOLT form（40-52V）to（40-56V）; AC Charge Start Volt from（38.5V-52V）to（40-57V）; AC Charge End Volt from（48V-59V）to（42-59V）; Gen Charge Start Volt from（40V-59V）to（40-57V）；Gen Charge End Volt from（40V-59V）to（42-59V），AC Couple Start Volt from（start-59V）to（42-59V）.
9. New Feature for LCD display: "Connect in xxxs " for the waiting time to on-grid mode will be showed at the top line of the home page.
10. Logics optimization on Generator dry contact control: Warming up the generator for 2 minutes before entering charge mode and cooling down the generator for 2 minutes before cutting it off.
11. Optimization on voltage drop of EPS output while connecting or disconnecting with heavy load has been done.
12. Logics adjustment: When forced discharge function is enabled, AC coupling power will prioritize to export to grid instead of going to AC charge mode.
13. Logics adjustment: When PV energy is weak, to prevent switching PV grid on mode frequently with high frequency relay clicking noise, the time delay to enter another check changes to 2 seconds.
14. New Feature: System charge end SOC:0-255%, VOLT :40-59V.

EG4_EAAB-1312

2023-08-16

Changes log （Same as fAAB-1312）based on FAAB-1010.
1. Optimized surge power and addressed voltage drop concerns when operating in EPS mode.
2. "PV sell to grid" function is supported; Note that it's not yet available for parallel systems.
3. Refined parameter adjustments for LUMA Grid regulation.
4. With firmware version FAAB-1010, enabling the "run without grid" function won't activate generator dry contact logic.
5. Resolved EPS overload triggers from both total EPS voltage and split-phase voltage.
6. Improved control to prevent " BUS voltage High " issue when operating in AC couple mode.
7. Enabled RSD control synchronization in parallel systems.
8. Implemented "strict zero export "; When PV and battery energy suffice for loads, the inverter won't exchange energy with the utility grid.
9. Modified AC coupling input recognition, treating it as PV input with equivalent priority as integrated PV power.
10. In previous firmware
FAAB-1010
and with fast zero export active, the inverter won't switch to PV charge mode when battery energy is low.
11. Improved surge capacity: For power levels between Pn and 1.16Pn, 10 minutes; and between 1.16Pn and 1.3*Pn, 5 minutes.
12.Default settings for Lead Acid mode include a charge voltage of 55V and charge/discharge current limitation of 0.5C.
13. Enhanced generator quick start functionality.

EG4_EAAB-1010

2023-06-30

Changes log （Same as fAAB-1010/ eAAB-1010/EAAB-1010）based on FAAB-0D0E.
1. Enlarged the grid sell back power limitation, if power limitation is high than 200%, then real limitation will be 1000% max.
2. Peak-shaving logic optimization.
3. Fortress battery protocol optimization: working in lead-acid mode where is communication failure issue.
4. AC Charge according to SOC or VOLT could be supported in this firmware version.
5. Octopus charge function is supported.
6. To avoid relays clicking on and off frequently due to grid fluctuation， a return value has been added in this firmware version.
7. Hina battery protocol is supported in this firmware version.
8. Grid regulation changes: Hawaii changed to HECO, added KIUC grid regulation.
9. Battery capacity could be showed in the LCD display.
10. Optimization on AC coupling function: AC charge and battery discharge will be seamless switching way.
11. Fans control logic optimization to reduce fans noise

EG4_EAAB-0D0E

2023-05-12

Changes log （Same as fAAB-0D0E/ eAAB-0D0E/EAAB-0D0E）based on FAAB-0C0D
1. Fixed the logic issue when PV energy is low, the inverter would fail to switch work mode from PV charge to battery discharge
2. Optimized charge logic of AC coupling input and maximize the use of AC coupling charge
3.Optimized the logic of charge limit in AC charge mode.

EG4_EAAB-0C0D

2023-04-13

Changes log （Same as fAAB-0C0D/ eAAB-0C0D/EAAB-0C0D）based on FAAB-0C0C
1. Adjusted Control logic of Aging test in Luxpower factory

EG4_EAAB-0C0C

2023-04-03

Changes log （Same as fAAB-0C0C/ eAAB-0C0C/EAAB-0C0C）based on FAAB-0B0B
1. Adjusted Control logic of Aging test in Luxpower factory

EG4_EAAB-0B0B

2023-03-28

Changes log （Same as fAAB-0B0B/ eAAB-0B0B/EAAB-0B0B）based on FAAB-0A0A
1.CT direction could be corrected remotely and individually in 3phase parallel system.
2.Non battery shared mode, current limitation will depend on individual battery banks
3.Fixed discharge configuration in LCD: in previous version, discharge power needs to be configured twice to take effect, and this bug has been fixed in new version.
4.Fixed discharge configuration in LCD: in previous version, discharge power needs to be configured twice to take effect, and this bug has been fixed in new version.
5.Modified Hawaii Grid regulation: QV curve