Cannot Change SOC Limit

#1 John_Bennion 2026-08-07

I would like to charge my batteries overnight. I've set the time but cannot change the SOC limit. I can select a new value but when I press the green arrow, I receive a caption "Could not write register 242". Check connection and value. I'm not on the premium option.

Can anyone help?

Thanks

#2 DD 2026-08-07

John_Bennion I think you have an AC-coupled inverter ? I see three different charge soc registers in the map - I think it must move around between revisions ? (Possibly when they introduced multiple charging slots ?)

        "charge_soc": Def((C.duint8, 0), None, HR(43)),
        "charge_target_soc": Def(C.uint16, None, HR(116), valid=(4, 100)),
        "charge_target_soc_1": Def(C.uint16, None, HR(242), valid=(4, 100)),

with an additional related comment elsewhere:

       # gen-1 defines HR(31)/HR(32) as charge_slot_2, but later generations
        # define it at HR(243)/HR(244) instead.
        # It doesn't seem to work on gen-1 anyway (changes get overwritten),

Rather than using 'direct control', does it work if you use 'timed charge' in the 'inverter settings' section ? (Or is that premium ?) Maybe it has a better idea of what works on your inverter ?

#3 John_Bennion 2026-08-07

Thanks for the explanation and trying to help, DD.

I've tackled the problem another way by changing/using the settings in my RubikCube's Monitor.

#4 SteveCook 2026-08-07

My Gen1 Hy 5.0 was ignoring my min % limit until The Dragon upgraded me to battery 3022 about 9 months ago. Been fine since then