Im looking into doing another solar grid tie system, not sure when Ill do it
but was wondering if the array was 3000 watts, 300 to 400 volts dc around
8 or 9 amps what size wire would be needed to run 230 feet.
Thanks :)
your design is 10 adc at 250 feetout 35watts loss ?
there are tables on WWW available
and calculators ...
http://yeroc.us/calculators/wire-resistance
plug in the type of cable, size, length, current ...
I plugged in #4 aluminum, 250 ft, 10ADC
about 20watts loss -- not bad
viola
t
i see about a 1.95% voltage drop using #10 copper wire at 300v and 10a. very doable. if the other array is combined with this one then you must account for the additional current flow. with double the current this would move the required wire gauge 3 spaces or to #7. this is an odd gauge number so move to the next one or #6. this would have a voltage drop of about 1.55%. of course you can run 2 separate runs of wire instead of combining them at the pvs if using the #10 wire. you would probably still want to combine them at the cc or before entering the building making a short run of the bigger wire necessary there.
for the record the guys at midnite like to keep that % below 2%, which represents a loss of power, so it does not hurt going to 1% or even less, but it is more expensive in the costs of the wire.
Thanks for the replys...... :)