Getting ready to install my 12/2000 Multiplus on my 272AH 12V battery bank, Daly 250A 4S BMS. Anyway I read on the forums here to use 4/0 wire. While that sounds great and all my Negative wire is limited to the small wire of my BMS. I also read to use a 350/400A Fuse/Breaker on my Positive side, while that is fine, Should I limit that to a 250A so I don't exceed 1C of my BMS?
What size fuse/breaker should I use?
Do I need to run 4/0 or will something smaller like 1/0 be sufficient? (<5' Run.)
On my 12/2000/80 (with a 400ah AGM bank), I had pretty short cable runs, so I went with 1/0 cable. I'm using a 200A breaker (well within the cable ratings), as that's plenty to support max continuous output of the inverter (and a very brief spike over 200A while starting a big load won't trip the breaker anyway based on its trip curve). I might lose a little bit of overload / surge capacity with the smaller than recommended breaker, but for my use, it's not a concern.
When I finished the install, I load tested with a 1500w space heater and everything worked perfectly.
I do believe the information is available in the Multiplus 2000 manual.
Yes, They list it as 2/0 or 70mm2 BUT It is impossible to do so using the BMS is what I am saying?
The BMS comes with cables, <70MM2 so Naturally I would think Breaker this to 250A or so, maybe a hair less?
Seems sensible to size the fuse at 250a.
It should not blow under regular operation of the 12-2000.
