Classic 200 wiring size for 57/58 amps

[SolarMusher]

Is 6AWG output wiring large enough for 57amps (array will be 74.4 Voc/60.86Vmp/29.63 Isc) on a Classic 200 (cold winter)? Or do I need to wire this 57 amps output with 4AWG?
Thanks for your input,
Erik

[Kent0]

6 AWG THHN copper wires are good for 65-amps when connected to the 75°C rated terminals on the breakers and charge controller, so they will be fine for the 57-amp output. They must be protected with a 65-amp, or smaller, breaker too. I'd use the 63-amp DIN rail breaker.

The input wiring needs to be rated for at least 46 amps so you could use 8 AWG with 50-amp breakers on the input. But don't run the 8 AWG (or the 6 AWG) wires for a long distance - the losses will be too much. At 100 feet the losses are 7.5% with the 8 AWG and with 6 AWG the losses are 4.7%.

[SolarMusher]

Hi kent,
I'm afraid of cold and cloud effect which could result in overcharge above 57A. This output is wired with 6AWG and 60A breaker into a E-panel, maybe 24 inches length. At the very begining, I wanted to go with a 48VDC battery/inverter system but this guy have a little array on tower (4x 48W/15.9Vmp) that he still would like to use with a new stronger array (6x 245W/30.43Vmp), so I'll have no other choice than to go with 3 series (2x 245W/30.43Vmp) + 1 serie (4x48W/15.9Vmp) and a 24VDC system.
I'm not a big fan of 24VDC system except for small cottage. I was thinking it would be more safe to wire this output with 4AWG and 80A breaker (classic 200).
Erik 

[Kent0]

Even in a location where the winter temperatures drop to -60°C, there is no reason to use the Classic 200 rather than the Classic 150 for an array that has a nominal Voc of 74 volts. And the breaker options are better with the 150-volt rating too. Either way, 150 or 200, the Classic can be set to limit the output current to a value a little lower than the breaker rating to prevent it from tripping the breaker.

[SolarMusher]

Hi Kent,

the Classic can be set to limit the output current to a value a little lower than the breaker rating to prevent it from tripping the breaker

Yes, you're right, I forgot it  . I'm going to look at the Classic 150. Thank Kent.