Hi wrenches,
I have a
question about sizing the main OCP breaker for a panel combining the output of
several true three-phase output inverters. To be precise - 10 of the Refusol
20kW, which connect to 480V/277 Y with a max output of 24.1 amps, each
inverter has a 3 pole breaker, line a, b, c and a neutral, which doesn’t
apparently carry any current.
Recommended
interconnection breaker is 35 Amps. Ok fine, but what should the main breaker
and
main panel busbar rating be?
What I’m not
sure about is if this is the right equation for the main breaker in a panel
combining all ten inverter outputs:
10 x 24.1A x √3
x 1.25 = 521.8 A
or is this the
right equation:
10 x 24.1A x
1.25 = 301.25 A
The busbar
rating should be easy, once I get the main disco OCPD figured out.
Main OCPD + (10
x 35) ≤ 120% busbar rating
Thanks for the help!
Rebekah Hren
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