Find out the best way to install solar panels yourself with this particular video in using a combiner box and breakers of the best way to wire solar panels. – Electric-Security/Electrical Enclosures/Combiner-Pass-Through-Cartons/Midnite Solar MNPV3 Combiner Box/p4567/ By combining the positive cables together and the negative cables together, you keep the voltage the same, but raise the current (amps). You’d wire in parallel when the solar panels’ voltage fits the battery bank voltage, and you’re utilizing a PWM solar charge control, which needs the solar array and battery bank voltages to coincide.