10kva inverter battery

[hhsting]

I 10kva 208V three phase inverter/battery supplying 60A MLO panel A. The inverter/battery is for loads NEC 2017 Section 700.12(A)
Demand load on Panel A is 3kva.

panel B has 60 A feeder breaker supplying the inverter/battery.

So what it looks like is shown attachment.

1. Would not the 60A breaker be too large for 10kva 208V three phase inverter/battery?

2. If power goes out then in inverter/batter is feeding the MLO panel board 60A. Their is no breaker upstream that is protecting the Panel A. Should not battery/inverter have output breaker?

 

[d0nut]

1. The 60A breaker looks like it might be too large for the 10kVA 208V, 3ph inverter, but you would need to look at the equipment requirements to be sure. Are you sure the inverter is 208V, 3ph and not single phase?
2. I would expect the inverter of that size to have an output breaker or breakers. Again, you would need to confirm with the actual equipment.

 

[anbm]

The inverter must come with 35A/3P input and output breakers if you specify.

 

[hillbilly1]

And if single phase, it will be 208 in, but 120/240 single phase out.

 

[wwhitney]

Not sure how the 10 kVA inverter/battery works, and how the battery is charged, but it could be designed to provide 10 kVA of output capacity even while charging the battery (e.g. after an outage). In which case its input power requirements would be 10 kVA plus the battery charging power, and so could be well in excess of 10 kVA. That means the 60A supply is not necessarily oversized.

Cheers, Wayne