Wiring Two Solar Panels In Parallel

Wiring solar panels in parallel causes the amperage to increase but the voltage remains the same.

Wiring two solar panels in parallel.

You do not want to wire more than 2 panels in parallel using couplers because this does not give you over current protection between the two panels. During shading night when there is no generating power from solar panels the battery stored energy will be used as a backup power and it. If we have two solar panels with the same voltage but different wattage there is no problem. They can be wired in parallel.

The following wiring diagram shows that the two 12v 10a 120w solar panels connected in parallel will charge the two 12v 100ah parallel connected batteries as well as power up the ac load through batteries and inverter during the day in normal sunshine. When an installer wires your solar panels in parallel each panel s wires are connected to a centralized wire leading from the roof. With parallel solar panels the positive terminal from one panel is connected to the positive terminal of another panel and the negative terminals of the two panels are connected together. The solar panels are usually designed that they can handle being backfed from one panel but if you have a whole bunch you do run the risk of ruining your solar panel.

The amps of electrical current for each solar panel are summed together but the system voltage stays the same. Connecting panels in parallel requires heavier wire to handle the higher current 25 amps vs 5 amps in the examples above and you need more wire to make all the connections to the different panels.