combining wire gauge formula
as my system grows, the need for thicker copper cables becomes increasingly apparent from the solar panels to charger to inverters. The battery cables are all 2/0 gauge..no problem. But the charge controller cables came with 4 gauge cables which get hot in full sun (100 amp input at 24volts). So i have doubled up the cabling and paralleled connected equal lengths of the 4 gauge cable (easier to do instead of re-wiring) Question is does 2 4gauge cables paralleled same length equal a 2 gauge cable ?...I assume yes and if so, what gauge would you end up with if you add a 2 gauge cable to a 4 gauge cable the same length ?? is there a formula for this ???