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February 18, 2026 5:09 pm
If you have the Indoor Wall Mount batteries read the post from "Krzysiek_KTA" above. The solution he found to the brown outs that we were experiencing were solved when we got the Firmware for the batteries updated. He was able to do the update, I don't have the skill set required so my installers got the equipment (cables and a electronic box) and updated the Firmware. Works as described above. (You must shutdown and restart the system several times.)
Natwall1 reacted
February 19, 2026 1:20 am
Certainly, thank you so much! I don't think I have a Ticket #, have simply been emailing back and forth with their tech support? or maybe I'm missing something. But my Serial # 51200E0399 . I have 6 of those EG4 batteries in a rack, not wall mount, and only have the Flexboss 21, not Gridboss (just trying to make sure I had explained my system accurately). Again, THANK YOU. I am hoping you can help me figure this out.
February 24, 2026 10:03 pm
@natwall1
I would recommend updating the firmware! Most of the time the firmware update resolves this issue, other than that the settings look good and if the firmware doesn't fix it, we can continue troubleshooting with looking at how everything is wired.
February 25, 2026 5:12 pm
@eg4eric Thank you for suggesting this. Do you happen to have a link to instructions on how I should do that? I am assuming you are talking about the Flexboss firmware, and not the batteries also, is that correct?
March 9, 2026 9:07 pm
Topic starter
May 30, 2026 7:02 pm
Reviving the thread.
After over 6 months flawless operations in Lithium type 1 mode the issue resurfaced this month. I had few nighttime charging interruptions earlier this month and today for the first time since last year the power blip occurred during daytime when I am operating in true off grid mode.
I think it might be a time to deep power cycle the system again.
My plan is to switch to lead acid mode cycle the battery 100-0-100% perform deep power cycle and switch back to Lithium type 1
Will post the outcome.
Brgds
K.
This post was modified 3 weeks ago 3 times by Krzysiek_KTA
Topic starter
May 30, 2026 9:44 pm
SO I made BIG mistake.
since I was to work with the Setup I decided to upgrade firmware. it showed successful and after 30min all shut down.
AND
00 internal communication error occurred and the system is down.
The battery is Full visible in the app but the inverter doesn't power up the house
What a mess....
Topic starter
May 30, 2026 9:50 pm
Topic starter
May 30, 2026 10:58 pm
What I was thinking initiating firmware upgrade on the Weekend!?!!?
I guess I had way too much trust in EG4 that it actually works as intended.
K
Topic starter
May 31, 2026 1:50 am
Firmware problem solved - see my other post in firmware section.
I have deep power cycled inverter, battery and BMS and switched back to Lithium type 1.
Will report if the 'blip' issue is solved
Brgds
K
Topic starter
May 31, 2026 1:51 am
@ EG4 Eric - pls disregard my previous firmware downgrade request - let's see if the latest one holds
Brgds
K
Topic starter
June 2, 2026 8:14 pm
Deep power cycling the battery, BMS and Inverter did not solve the 'blip' issue.
Switched back to Lead Acid mode for a time being. Will try to update the battery firmware and power cycle again sometimes in the future.
Brgds
K
Topic starter
June 3, 2026 7:40 pm
Well,
I decided to give it a shot and update the battery firmware through EG4 monitoring app - the most recent inverter firmware supports that.
The result = totally bricked BMS of the indoor 280kWh battery, despite the EG4 Website monitoring website says the update was successful.
(BTW the deep power cycling won't help, there is no change after repeated attempts)
In principle the BMS damage is done - no subsequent "successful updates initiated by myself or the Signature Solar Tech Support helps.
Moreover the 'manual" USB-RS232 updates I succeeded before failed.
The Indoor battery BMS is dead. Luckily I can still use the battery in 'manual' Lead Acid mode. Hope the case I raised with SS get raised and the problem is eventually rectified.
hope it gets resolved sooner or later....
Brgds
K
June 4, 2026 4:28 pm
I had the same issues ~ 4months ago that I thought i had fixed. Unfortunately, today they started up again.
Ignore the title of the article.
- The actual issue was that the batteries lose communication at seemingly random times. I do see some correlation with this happening during peak PV input times.
- The inverter decides to make a panic decision to cutover to grid power (Im using grid backup on my system)
- It's not clear what makes the inverter decide to resume back to regular operation even though communication starts back up soon after.
My issue appeared to be resolved after updating everything to latest firmware, ensuring everything was wired correctly, and then power cycling everything.
HOWEVER --- it started again today. 🙁
System :
2x 12000xp running in parallel.
6x eg4 wallmount indoor 280AH batteries in shared mode.
Topic starter
June 4, 2026 5:36 pm
An UPDATE,
I managed to restore my BMS bricked by EG$ monitor site firmware update tool.
The successful RS232 firmware update did nothing, only after updating RS458 firmware afterwards the BMS came to life - alt least locally. So I followed my previous footsteps and deep power cycled the system couple times and all came back to life as last lime in 2025.
I am Yet to see is the underlying BMS comms issue which made me to update the firmware is resolved
I am expecting to receive the firmware updater from EG4 Tech support as the online tool simply brick the BMS the PC based setup is cumbersome.
I am back online and off-grid in Lithium Type 1 mode - let's see for how long.
Brgds
K
