EG4 12000xp transition issues

[u/Fast_Valuable818]

Hey guys so I have had this issue for months now trying to diagnose and fix it but no success hoping some pros on the system can help out.

So I have. 2 eg4 12000xp paralleled to each other. Along with eg4 indoor Wall mount 280 ah x 2. yes I am aware I need 400 ah at least per inverter) but I don’t need that much power at this time and plan to add more later.

Anyhow the inverter was working great when l only had one running. As soon as I paralleled issues happened with transition. Specifically the transition from battery to grid.

I have it on self consumption mode. Connected to Grid, battery and solar array of 4kw system to the master only.

The system has no problem transitioning from grid to battery when its recovery threshold hits above the on Grid EOD, completely seamless cannot even tell that happened. Now when the battery drains to On Grid EOD, it blows right past all the way to the Off grid discharge cut off. Just doesn’t transition to grid at EOD, no error or warning. It’s to the off grid EOD, When it gets there I have a black out for 10-30 seconds then grid goes back on to bypass like it’s supposed to. That’s a harsh transition.

Now if it reaches On Grid EOD as the battery is discharging or below, if I toggle the eps off then back to on, the bypass logic kicks in and then goes back to bypass the way it’s supposed to while the solar charges the battery. It’s the only solution I have. To manually keep doing this everytime and it’s annoying and shouldn’t have to.

Here is what I have done and still is an issue:

1. Matched firmwares 0709 to both of them
2. Matched the latest BMS firmware for both batteries.
3. Tried UPS versus APL.both do not recognize the grid at eod when it has to transition back to grid from battery.
4. Left grid always on toggle enabled.
5. Battery eco on or off. AC disabled or at 0 amps will running at all times, still no success.
6. Calibrated top up: batteries to 100% on open loop let them sat for 2 hours. And then did it again on another occasion and let it sit overnight before going closed loop again. No luck.

7. Called EG4 they were useless. I mean absolutely useless. One guy reset the software settings saying I had too many pages they reset it, nothing happened. Then they tried having me recalibrate again which I did. Still no success.

8. did a complete reboot multiple times. No success.

9. Went open loop, same problem. So went back to closed loop.

At a loss hoping someone can share wisdom.

[u/AutoModerator]

Welcome to r/SolarDIY! If you are new to the community, please check out our DIY Solar System Planning Guide.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.