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corn18 · 09-14-2021, 07:24 PM

Quote:

Originally Posted by Bobby F

Oh oh. That's what I use. 30 amp. Seems to be a standard choice. But I don't think I've ever actually switched it off in two years, except at install.

I ordered a couple of these off Amazon. Should do the trick nicely for switches between the panels and charge controllers.

Here's an update to the diagram. Added a 100A CB at the converter for when it's in charge mode. Swapped the position of the 1200W and 2000W inverters so the 2000W is closer to the batteries. Added a dedicated ground wire from the converter to the - bus bar. Cleaned it up a bit.

tt2retire · 09-17-2021, 10:46 AM

Since the 2 SOK batteries have a max discharge current of 100A each, wouldn't it be better to have 3ea 100aH batteries to increase the max discharge from 200A to 300A so that you have enough juice to power the 1200+2000=3200W of Inverters?

tt2retire · 09-17-2021, 10:48 AM

Or perhaps 4ea 100aH to better match the 424aH of the 2 206aH

corn18 · 09-17-2021, 11:18 AM

Quote:

Originally Posted by tt2retire

Or perhaps 4ea 100aH to better match the 424aH of the 2 206aH

Probably would have been better to go 4x100Ah, but the two SOK 206Ah fit perfectly in my slot under the stairs. Form over function, right?

I had my microwave running on the single SOK 206aH and it was drawing 125A continuous, so I'm not sure what the limit is on the SOK. I know it says 100A. I was also pumping 55A into the batteries from the converter, so maybe there is some headroom with the BMS. I will have to do more experimenting to see.

The fridge draws 50A @ startup for 1/2 sec and then 12A continuous. So that would leave me with enough amps on the 2000W inverter to run whatever I need to. Might not be able to make coffee and run the microwave at the same time.

corn18 · 09-20-2021, 01:37 PM

UPDATE:

I redid the install and eliminated the Chinese stuff. The main breaker is now a 3 pole 250A from Blue Sea mounted in a box. Went with 4/0 for the main battery cables up to the bus bars. Then 2/0 to both inverters. 2ga to the converter. I dropped the breakers for the inverters. The main breaker will protect those 2/0 wires fine. Besides, I couldn't fit 4/0 lugs into the inverters and didn't feel I needed an additional breaker for 2/0 wire. That stuff is a beast.

I have a second SOK 206Ah LFP on order. Should arrive next week. The 2x200W solar panels are in but it's raining, so that'll have to wait. And still need to heat shrink the connections.