max output amps on optimizers

[Zee]

When sizing conductors connecting to a string of Solaredge optimizers, do I use the actual circuit current (string W/ 350VDc or 400 VDC depending on inverter) or the max rated optimizer current of 15A?

 

[Carultch]

When sizing conductors connecting to a string of Solaredge optimizers, do I use the actual circuit current (string W/ 350VDc or 400 VDC depending on inverter) or the max rated optimizer current of 15A?

For ampacity purposes, any place you'd ordinarily use 1.25*Isc, you would use the 15A optimizer max current value.


Any place you'd ordinarily use Imp, like voltage drop or equipment labeling, you'd use the P=I*V current based on the STC power and the inverter operating voltage.

 

[ggunn]

For ampacity purposes, any place you'd ordinarily use 1.25*Isc, you would use the 15A optimizer max current value.


Any place you'd ordinarily use Imp, like voltage drop or equipment labeling, you'd use the P=I*V current based on the STC power and the inverter operating voltage.

I use 15A for all that stuff; it's the worst case scenario.