Adding a second inverter

[ericfx1984]

Hey guys and gals

Hope everybody's doing well

I'm getting ready to add a second inverter to my existing system... Now this is a temporary install... I will post system specs at the bottom

Currently, I have 1/0 gauge wire coming off of the batteries and BMS and then running to a 350 amp blue sea switch, being used as a combiner... After that it comes off as a 4/0 gauge cable straight to the inverter

Each of the batteries has a class T fuse that is 250 amps

Between the battery and the switch

I would like to add a 3000 w 12 volt inverter that I have laying around... This would be direct connected to my 12,000 BTU, 120 volt, inverter mini split... The absolute max I've ever seen this thing pull is 1800 watts... And that's extremely rare typically it's closer to 500w or less

There wouldn't be anything else on this inverter so we really wouldn't see any more than 1,800 Watts being pulled at any given time

I'm thinking about running a 1/0 gauge wire off of one of the batteries and once I see row gauge wire off The other battery directly to this new inverter... I would probably use a 150 amp ANL fuse on each positive line

I knew that battery cable would be undersized to feed a 3,000 watt inverter... But I also don't think that I would be pulling anywhere near full power on this inverter ever... This is only going to be a temporary thing to get me through this summer

The big problem I'm running into is we have a small window air conditioner that we sometimes run off The existing 3000 watt inverter at the same time... If you combine that with the possibility that the wife might kick on the microwave... It's quite possible that we could be well over 3,000 Watts... This is never happened but I also don't want it to ever happen


Battery's.

1.) 4p4s 304 ah (1216 ah, 4s) w/ 200 amp jbd BMS

2.) 2p4s 230 ah (460 ah, 4s) w/ 200 amp BMS

These are in parallel


Inverter

1.) Aim Power 3000w low frequency inverter with 100 amp plug in charger


Solar charge controllers and solar panels

1.) Victron 100/50 with 2, 300 watt, mono, split cell panels in series (600w, around 80v)

2.) EPEver 40 amp, MPPT, with 3, 200 watt mono, panels in series (600w, about 70v)

3.) EPEver 60 amps MPPT, with 3, 250w, poly, panels in series (750w, around 120v)

4.) EPEver 60 amps MPPT, with 3, 250w, poly, panels in series (750w, around 120v)

5.) EPEver 60 amps MPPT, with 3, 250w, poly, panels in series (750w, around 120v)

 

[12VoltInstalls]

I see your point… if you fuse the battery output to the 1/0 I don’t see a problem for “temporary” EXCEPT that I’m often bothered about sketchy stuff that makes fire.

I ran 2/0 for a 1200W inverter which enabled upgrading to 2000W inverter without buying cable fwiw

In your case that 3000W could surge past your envisioned 1800W on startups, blowing your expensive ClassT. I’d probably buy the few feet of 2/0 and just make it what it is because you shouldn’t overfuse any cable.