rmartin
Member
- Location
- branchburg nj
I have a 400 amp 600 volt ac fused disconnect connected to an inverter whose output is 316 max output . The system is designed to produce the maximum output during solar noon . The blades on the disconnect are over heating. I am trying to resolve the issue . This is the calculations I was given by the designer.
316 x 1.25 = 395 amps
Disconnect is rated for 400 amps and fused with 400 amp fuses Nema 3R
Wiring is parallel 250 MCMs .
What I have concluded is that the disconnect is only rated for 320 amps for continuous use and not suitable for use.
What i am being told is that the disconnect can handle the 316 amps from the inverter and that the calculations cancel each other out.
The disconnects are sitting outside in the sun on the side of the building .
What derates would apply ?
316 x 1.25 = 395 amps
Disconnect is rated for 400 amps and fused with 400 amp fuses Nema 3R
Wiring is parallel 250 MCMs .
What I have concluded is that the disconnect is only rated for 320 amps for continuous use and not suitable for use.
What i am being told is that the disconnect can handle the 316 amps from the inverter and that the calculations cancel each other out.
The disconnects are sitting outside in the sun on the side of the building .
What derates would apply ?