posted 9 years ago
If your module voltage is 36v, you could run two strings of 8 at 288v. This specification is important to have correct. You would need pv module voc and mppv and your historic low outdoor temperature to be sure, but it looks pretty safe as far as max voc and your inverter has wide input operating voltage range with a low strike voltage.
Chris always hits the point that higher voltage to a point, makes for lower cost in power handling across the entire system and especially any time distances are anything but short and/or the power requirement is high.
Your pv wiring will likely have 2x 15a breakers combined (sometimes combined at or near the control) onto a homerun capable of handling 30a and adjusted for voltage drop over its length.
The actual operating current per string might be around 4.5a-5a
Combined for a single set of conductors-home run, distances up to 250 (1% loss at 150') would have acceptable wire loss on #10 copper. This is economical.
For inverters, i run it high as your array architecture and equipment can without going over the inverters max voc.