Solar Panel Wiring Instructions

Solar panels are similar to batteries in that they operate with direct current (DC). Also like batteries, solar panels can be wired in either “series’ or “parallel.” A series arrangement connects the positive lead of one panel to the negative of the next, resulting in the volts of all the panels being added together. While there are some applications that use series installation, for most practical uses you will want to wire your solar panels in a “parallel” configuration. Parallel wiring will not increase the voltage of the system, but will increase the amperage, which is the useable power. Wire size will depend on several factors. The higher number of total amps, and the longer the connections, the larger the gauge of wire you will need.

Parallel Wiring

Solar panels should be wired in parallel configuration for common applications.

Step 1

Connect all the positive leads, from all the panels, to the positive terminals on the combiner.

Step 2

Run cables from the positive and negative terminals on the combiner to the positive and negative terminals on the battery bank. Connect all the positive and negative terminals on the batteries together.

Step 3

Run a cable from the positive terminal on the battery bank to the circuit breaker, and then to the positive terminal on the inverter. Connect a cable from the negative terminal of the battery bank to the negative terminal to the inverter. If you are will be connecting other equipment the systems install a shunt, for the grounding wires, between the negative terminals of battery bank and the inverter.