Is .85 a good efficiency number for a growatt inverter? I thought they were closer to 95%…5000W / 48V / 85% efficiency = 125A max draw from the batteries so you need to wire accordingly (1AWG or bigger would be good). 125A * 125% = 156A fuse size. I would round that up to a 175A Class T fuse for the main battery fuse.
Hopefully you have at least 4/0AWG wire otherwise the fuse is too big. Also, what size BMS do you have on each battery? A 400A fuse on a battery with a 100A (or even 200A) BMS seems rather oversized.400A class T fuse on each 280Ah battery
I have no idea what the efficiency of a Growatt inverter is but 85% seems like a good conservative value when working out the details. I'd rather end up with a slightly oversized wire and fuse to avoid hot wires or overstressed setups.Is .85 a good efficiency number for a growatt inverter? I thought they were closer to 95%
@Roswell Bob Yes, 16S 280Ah*2. My plan is a 300-400A class-T on each pack (400A means in an emergency I can drain anything the pack can safely put out, if I even can find the loads to do so), that feeds through BMS to a 175 or 250A breaker in the combiner box, which can also be my battery string servicing disconnect. Then each inverter has its own breaker in the combiner box, as do the SCCs. And thanks: yes, I do need to add a precharge setup, and despite some comments helping others with them the past couple days I hadn't really gotten to thinking through mine yet.
ETA: I'm not the OP here; my system is somewhat confused in the discussion as I'd offered my plans for OP to consider. I appreciate the comments on mine, too, as they're helpful.