Seplos Mason battery kits from Frogstar

Nick_Dr1

I have a Sofar 3600ES inverter. This means I'm limited to 3kW charge/discharge by the inverter, not the battery. I have a 16kWhr battery now (Fogstar/Seplos) but previously had 7.2kWhr Pylontech (3 x 2.4kwhr stacked). The Pylontech worked well but with the installation of a heatpump, didn't really have the capacity to run the house over the 4 to 7 expensive period with any spare capacity for the evening. A 15kWhr unit will do this no trouble. Its probably too big for the summer but is still useful as I can force discharge it at night and recharge it during the day from solar. This allows me to get the maximum from the solar array (5.2kW) as this overloads the AC capacity of the inverter (3.68kw) but I can still charge the battery with excess solar as it is DC. ie on a good day 3.68kW back to the grid AND (if its really sunny!) 3kW into the battery. Obviously the best I will get is about 1.5kw spare into the battery. There is always a limit or constraint. Usually its lack of sun but its frustrating when on a sunny day the inverter clips.

QrizB

michaels said:

Do you just have one 15kwh kit?  Would it be much more complicated if you had 2?

I imagine you'd parallel them, just like you do with Pylontech or Aoboet (etc.) batteries, and daisychain the data cables.
I think there's a setting in the BMS software somewhere to tell the battery its number in the chain, but as mine's just a big dumb box (no data connection to the inverter) I've not looked into that side of things.

Solarchaser

My view after messing about, is that actually nothing actually cares about the capacity.
The ones I have come with dip switches at the back and you can select different ones to tell the lux in my case, what capacity its dealing with.
When I initially linked the two batteries to the inverter I told the lux it had 200ah.

Then later I told it it had 100, and on a whim I set it to 400ah, the difference? None.
Which makes sense really.
The seplos says it can do 100a all day, but the lux can only do 70, so if you have 400a... the lux can still only do 70.

I think actually all it cares about is voltage and cares about its min and max and thats it.
1 of my set of 2 batteries is sitting at 100ah on one inverter and the other is set at 200ah on the other inverter.
The 100ah discharges and charges at the same rate, but retains a better soc.... because it has 305ah cells and the one I've said is 200ah has 280ah cells.