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