# DC Cable Loss

1. May 23, 2012

### wfl6

I'm doing the solar system design now .

so far seem like everything is on track,
but now i face a problem on the DC cable loss.

is that has any formula to calculate the dc cable loss,
i has using this formula is
(losses of the cable (Ω/km)x length X current produce by the solar panel (A))

Pls help me to clarify this .

Thanks

2. May 23, 2012

### rbj

maybe take this to the Electrical Engineering forum.

DC cable loss depends on what the cable is made out of (copper, i hope) which determines the "conductivity" and its cross section area and length.

3. May 24, 2012

### Khashishi

P = I^2 R
You need to square the current in your equation above to get the power lost. Your equation will give you the voltage drop in the cable, since V = I R

4. May 24, 2012

### the_emi_guy

wfl6
First find out what your wire gauge is (AWG).
There are a bunch of wire resistance calculators online. Search for AWG+resistance+calculator. Use at least two of them and make sure you get same answer.