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Max Soc at 85, still charges to 100
Posted: Fri Aug 15, 2025 8:17 am
by phips
Hello folks,
I’ve set my H1-5.0-E with 5 HV2600 to 85% max soc, but with all this glorious sunshine it’s still going to 100%
Have I read correctly that the max soc setting only applies to grid charging? And if I have, does that mean when charging from solar it’s always going to 100?
Is there anything to be done about that if one wants it to go to 85%?
Many thanks!
Mark
Re: Max Soc at 85, still charges to 100
Posted: Sun Aug 17, 2025 11:35 am
by Dave Foster
Hi, yes MaxSoc only limits grid charge, it will still charge to 100% by solar.
You could switch the inverter workmode into feed-in first which exports everything after the house load is met, but there’s no way of setting a schedule so that at 85% it switches to feed-in so you would have to guess the timing.
Only thing to add is that it does no measurable harm charging the battery to 100%, and it is warrantied for 90% depth of discharge (10% minSoC is mandatory) so best to leave the system to do it’s thing… or if you add a home assistant (via modbus) you can get much finer control of the inverter (but you would need at least some computer skills and spare time)
Re: Max Soc at 85, still charges to 100
Posted: Sun Aug 17, 2025 1:55 pm
by phips
Many thanks for the insight Dave, that's really helpful.
Luckily I have time, computer skills, and an already running HA installation. I might do some coded fettling (or might just leave it as is!)
On the 10% MinSoc, I have 'off grid' set to that, but on grid set to 20%. During the summer it's getting nowhere near that (most days the floor appear to be 45%). I presume this is all perfectly acceptable working for these batteries anyway?
Cheers
Re: Max Soc at 85, still charges to 100
Posted: Sun Aug 17, 2025 5:25 pm
by Dave Foster
If you don’t have the EPS system wired (critical power in the event of grid failure) you can leave both minSoc’s set to 10% as you don’t need to reserve any for the EPS.
It’s more important the batteries get to 100% than down to 10% but always good to occasionally cycle them completely so the BMS can reset both of it’s limits.
If you’ve got the time/experience connect up the modbus you won’t look back, the data and statistics alone make such a difference and with automations you can do just about anything you want with the inverter - control charge or discharge power, change workmode on SoC and/or time of year etc… the only warning is that it’s a bit of a rabbit hole you’ll find yourself in once you have it
