Wire Size Calculator
Size copper wire the way we size ours: NEC 2020 ampacity with the real derates, the equipment ground, and voltage drop over your actual run. Every answer is a starting size for your permit conversation, and your inspector has the final word.
The run
Pick the circuit, then adjust anything. Sizes come from the breaker or fuse protecting the run.
Panels to the inverter. #10 PV wire minimum, our standard.
The size
A code-based starting size, not a construction spec. Field conditions (conduit fill, terminations, exact route) get verified at permit.
This is the same engine behind our internal planset wire charts, and it errs conservative. It still cannot see your walls, your conduit, or your inspector. Use it to sanity-check a design or a quote, then let the permit process set the final sizes. Building a whole system? The System Builder picks every part, and the Array Sizer handles the racking.