Wire Size Tables For Low Voltage
FIND WIRE SIZE REQUIRED FOR LESS THAN 5% POWER LOSS
Read down the left-hand edge to the number showing solar amps or watts your wire will carry for off-grid power. Follow that line across to the right to find your wire length in feet from solar to batteries. At the top of the column above your wire length is the minimum wire size (gauge) to use. Smaller gauge equals larger wire.
Buried DC cables must be copper, wet aluminum with DC corrodes quickly.
If your total solar power is over 25 amps, it is best to divide the solar into two smaller groups and run separate pairs of cables to a 30 amp breaker for each group.
If you’re interested in building or improving your off-grid home, call us 208-263-4290 or contact us online for more information.