Recessed AC Combiner for (2) 25 kW Inverters

[bellington]

Good morning.

I have (2) Chint 25 kW 480 3-phase inverters to pack into a very small space. They will use the Chint FlexOM Gateway. To provide adequate space for air flow, I am considering using a standard 480-volt 100-amp recessed electrical panel with (2) 40-amps 3-pole breakers, and an 80-amp main for combining AC output. The 100-amp panel output would then connect to an 80-amp breaker in a 250-amp panel with a 100-amp main that also provides power for 3 water heaters. The 250-amp panel would connect to an 600-amp panel in another building. The 600-amp panel is connected through the switch gear to the battery, other solar, and/or generator. It is located in the Bahamas and falls under Canadian Code.

Questions:

1. Is there a better option for combining the (2) inverter outputs?
2. Will a standard recessed panel work for a combiner?
3. Will I still be required to have a separate disconnect if the 100-amp panel main breaker would serve the same purpose?
4. If I wanted to remotely open the circuit with the BESS, how should I go about that?

Thanks,

Byron

 

[jaggedben]

A standard 480V panel would be fine for an AC combiner. Nothing more special is needed.

Question 3 depends on a various details of installation under the NEC, I can't speak to the Canadian code.

You could probably use contactors or perhaps shunt trip breakers open the circuit remotely. (Won't be too cheap at 480V.)

(Is there grid or not?)

 

[electrofelon]

.



1. Is there a better option for combining the (2) inverter outputs?

Other option might be skipping the combiner and running the inverter outputs back to that 250 amp panel?

2. Will a standard recessed panel work for a combiner?

Sure, at least for siemens, the minimum box size would be 20 by 32, 5.75 in deep.

3. Will I still be required to have a separate disconnect if the 100-amp panel main breaker would serve the same purpose?

The combiner panel doesn't need a main breaker at least under the NEC

 

[bellington]

A standard 480V panel would be fine for an AC combiner. Nothing more special is needed.

Question 3 depends on a various details of installation under the NEC, I can't speak to the Canadian code.

You could probably use contactors or perhaps shunt trip breakers open the circuit remotely. (Won't be too cheap at 480V.)

(Is there grid or not?)

Thanks for the response. The battery/solar/generator will be the grid, unless the submarine 13.2 kV cable from neighboring island gets repaired, or replaced (not very likely).