EG4 Community Forum - Recent Topics

Unauthorized EG4 Products on Online Marketplaces

EG4 Eric — Wed, 09 Sep 2026 19:40:11 +0000

It has been brought to our attention that unauthorized sellers are listing products advertised as EG4 products on Alibaba, AliExpress, and similar online marketplaces.

Please be aware that these products are not authentic EG4 units and are not eligible for warranty coverage or technical support through EG4.

EG4 does not sell products directly through Alibaba, AliExpress, or similar platforms, nor do we supply authorized resellers who utilize these marketplaces.

If you come across a listing that appears to be selling EG4 products through one of these platforms, please report it to us at support@eg4electronics.com so our team can review it.

We appreciate your help in protecting customers from unauthorized and potentially counterfeit products.

BMS 15 W charge limit Bug

belandbroc — Wed, 09 Sep 2026 18:05:56 +0000

so I spoke with tech support yesterday on my two batteries that have this issue. they immediately changed my 12000xp to lead acid to get it working again (work around) and then sent me a text message with a video called "EG4 48v lifepower4 batteries how to update firmware". Problem is in the video it shows EG4 mailing some dude a packet with a usb device to fix the problem. My tech only sent me the video and then hung up, nohting is being mailed to me. I have called back many times and just put on hold for ever and ever. anyone have suggestions or should I just buy the RS485 cable and hook my laptop on it and try that fix?

EG4 Learn YouTube Channel – New Videos, Tutorials & How-To Guides

EG4 Eric — Wed, 09 Sep 2026 14:20:00 +0000

The EG4 Learn Channel is designed to make it easier for our customers, installers, and DIY users to learn more about EG4 products and get the most out of their systems.

📺 Check out the Learn EG4 YouTube Channel:
Learn EG4 – YouTube

Be sure to subscribe and keep an eye out for new videos!

My System keeps disconnecting the generator when charging batteries

gblemire — Mon, 07 Sep 2026 20:48:46 +0000

Hello,

I have a system with the following components

Gridboss21 + Flexboss21 + 3 Outdoor rated 280Ah batteries in parallel + Generac 18kW generator.

I lost grid power and i wanted to try to see if the generator would power the batteries. I set the SOC to 83% to start charging and 90% to stop charging using the generator. Once the batteries fell to 83%, the generator started and a few minutes later it is supplying power to the house and charging the batteries - all looks good. But a few minutes later the generator is disconnected but is still running and i go back to powering off of the batteries. A few minutes later the generator is connected and starts charging the batteries and the house, but is again disconnected after a few minutes.

So there are a few things I could think of that might cause this.

1) the generator power is noisy, but i don't see any faults or errors in the logs indicating this.

2) the load is too high for my generator. I set the Adc to 40 and i still see this issue, so i don't think this is the problem.

3) my system settings are somehow incorrect

4) my firmware is outdated. My Flexboss is FAB-2525, Gridboss is IAAB-1600 so i don't see any issues

5) my BMS is causing issues?

The good news is the generator does respond to Charge Start SOC and Charge END SOC, but the Generator is still disconnecting.

Best,

Guy

Lifepower4 V1 24 Volt Firmware

hkusp40 — Sun, 06 Sep 2026 12:29:59 +0000

Hi - I have 3 Lifepower4 V1 24 volt batteries and need to reflash the firmware. Would anyone know where I can find this to download? Thanks.

Adding 18KPV to gridBoss/FlexBoss21

alkreymer — Wed, 02 Sep 2026 01:09:36 +0000

Hello. I have currently GridBoss/FlexBoss21 setup with 4 280Ah batteries. I'm going to add 18KPV to that. Can both FlexBoss21 and 18KPV be connected to the same battery bank? Or do I have to split and keep separate batteries for each inverter?

Number of batteries

Walker — Sun, 30 Aug 2026 13:16:46 +0000

I have a grid boss with a 90amp breaker and one flex boss 21. I am currently have 3, 14.3 kWh outdoor batteries installed. I am looking to add additional batteries to my system but have been getting conflicting information. How many can I add without needing another inverter or a special external buss?

Does the breaker in the grid boss have any limitations on the number of batteries?

Flexboss21 Periodic Relay Toggling

ShankUSMC — Sat, 29 Aug 2026 14:41:45 +0000

@EG4eric

I have a 2 Flexboss21 inverters. Only one exhibits a strange issue of toggling a relay for several minutes at a periodic rate of 1 to 2 seconds. I don't see the purpose of toggling a large relay every couple seconds. It most often happens when the battery bank reported SOC is right at the selected Battery Backup Mode: Backup SOC%, just an observation. The other Flexboss21 never exhibits this issue. Also, ALL components have a finite service life. Whichever relay it is seems doomed for a premature failure at some point. To me this behavior is like a software hysteresis issue.

I have the latest firmware installed, FAAB-2727.

Has anyone else ever experienced this?

Periodic Re-Balancing or Re-Calibration multi-battery installation?

AnotherEG4User — Thu, 27 Aug 2026 15:02:08 +0000

Hi,

I have an 18kPV inverter/controller, a mixed array of panels (PV and micro-inverter) and 3 of the EG4 14.3kWh AW batteries. The system is grid-tied and usually runs in back-up mode. The inverter has been in operation for about 10 months and the batteries about 8 months. There are no operational problems at this point, but I do want to make sure I am taking proper care of the system.

Earlier this year (in the spring) while sorting out difficulties with wifi, the support tech I was working with recommended re-balancing (or maybe he said "re-calibrating") the batteries. He said that in a multi-battery system, this is something that should be done periodically. He did all of the settings, and I didn't quite grasp the process. I do recall that it involved setting the system to lead-acid, draining the batteries down a bit and then charging them back up. I had to call back in to him to get the system back to proper back-up mode.

It's been a few months and I called back in to support to say "Hey, I think it might be time to do this again." and the tech I was connected to didn't seem to understand my request. I couldn't get the tech to describe or agree to a re-balancing or re-calibration process. They switched the system to self-consumption to exercise the batteries, but re-balancing (going to lead-acid mode, etc) was simply not something they seemed to be able to talk about.

Can the folks on the forum--especially any EG4 staff that may be watching--answer a couple of questions for me?

1. Is periodic re-balancing/re-calibration necessary or recommended for my system/configuration?

2. If so, how often should it be done, and what is the step by step procedure for my system?

Thanks!