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It is currently not possible to obtain a "Lithium-friendly" CC-CV charge curve when running with open loop (no comms) between the 12000xp and Lithium batteries. User *should* be able to program and manage charge curve by setting:
Type= Li-OpenLoop
Vend-of-charge= 56.2(default), and Vfloat=54.0(default)
The result should be a CC-CV curve hitting the target Veoc hit once a day, held for 0 time, and settling to Vfloat. Veoc flag can be reset to detect "night" as any time that PV voltage < 50vDC
I would like to be informed when this bug is addressed, and suggest that it is propagated to to all inverter firmware. I'd love to see it start with the 12000xp and 6000xp since I have several clients installed off grid with these, and I'd like to see proper charging, safety, and maximize battery cycle life.
Posted : November 27, 2025 12:42 am
Topic starter
still no official response from EG4 when or if this bug will be addressed for the 12000xp ?
I really would like to see this (serious) bug fixed ASAP.
Posted : December 21, 2025 10:18 pm
Topic starter
STILL no fix......
and STILL no acknowledgement from Engineering that they are even working on it!
This is pretty terrible. I hesitate to sell/install any more 12000xp until this is resolved. I need confidence that I can set end-of-charge and float voltages in the Inverter settings, and verify that the charge curve is what I ask for. This is the whole purpose of AIO hardware managing charge control without an external charge controller.
If EG4 cannot deliver dependable charging for off-grid open-loop, I'll be forced to go back to some other hardware like MidNite charge control and inverter "separates" for my clients.
Posted : January 6, 2026 10:14 pm
Topic starter
I got a contact from EG4....but there is no fix yet. I still see voltage stuck at end of charge rather than relaxing to float once charge is complete.
Posted : January 12, 2026 10:11 pm
Topic starter
the silence from EG4 is deafening.
Posted : January 15, 2026 8:16 pm
Topic starter
I finally got a reply today from Support acknowledging this problem, and confirmation that "they are working on it".... but no target for release of an update yet.
Posted : January 16, 2026 12:39 am
Topic starter
ping.
@eg4eric , any word on target date for release of an update to address the "no float" bug with the 12000xp open loop charging?
Posted : January 19, 2026 5:42 pm
Topic starter
ping.
@eg4eric , any word on target date for release of an update to address the "no float" bug with the 12000xp open loop charging?
Posted : March 2, 2026 4:58 pm
I own a 12k pv hybrid inverter, I think I am seeing the same charge dynamic . Is this possibly an issue on more than just the 12000xp ?
Posted : March 2, 2026 7:11 pm
Any updates on the issue? I have 5 12000xp's in open loop.
https://www.youtube.com/c/MikesGarageRoute66
https://www.windsolarforum.com
Posted : March 12, 2026 2:04 am
I'm a new 12000XP owner, and I am perplexed that basic lithium charging algorithms are not implemented. Lithium batteries should not be floated. They need no absorb period. They simply charge in CC, then CV until current drops to C/20 (all values should be configurable based on chemistry) and then charging should completely shut off until they dip below a certain SOC/voltage (configurable). Lithium batteries kept floated age faster.
These settings create tradeoffs between energy stored and longevity, so advanced users should be able to tweak these based on their own needs.
If I buy a commercial off the shelf lithium charger, these settings are all configurable. I would recommend EG4 look at other charger offerings, such as DeltaQ, for inspiration.
@eg4eric there are a lot of us that run "open loop" that are really wanting this feature! Please convey the urgency, and thank you!
Posted : March 23, 2026 12:44 am
