Fuse Between Solar Panel And Controller

The size of this fuse is dependent on how many solar panels you have and how they are connected series parallel or series parallel.

Fuse between solar panel and controller. When sizing this combined fuse breaker we must first determine the worst case current that will flow based on our specific panels. The first version of this system used 20a class cc fuses and a bulky fuse box meant for home solar. In a parallel system a combiner box is used that holds the fuses breakers to each panel plus one or more combined fuse leading to the charge controller or grid tie inverter see figure. That does not mean you should use a 80 amp ocpd it just means that is the largest you can use in your application.

The second fuse between your solar panels and charge controller is a little bit different to figure out. I need to put a fuse between the battery and the solar controller. With an 8 awg copper conductor between the controller and battery you can use a fuse or breaker up to 80 amps using a 90 degree conductor insulation in free air. For that setup you will not need fuses between the solar panels and the charge controller.