Fuse Between Solar Panel And Charge Controller

There are three different locations that we recommend installing fuses or breakers.

Fuse between solar panel and charge controller.

Mini fuses are typically used for small system components like battery management systems or monitors. I guess the fuse it ment to safeguard the solar charger if you by accident should short the wires or swap the wires on the battery. Maxi fuses provide circuit protection typically between a charge controller or small inverter and a battery bank. Mppt charge controllers on the other hand are able to both lower the voltage and increase the current flowing between the controller and the battery bank so the exact size wire and fuse size must be recalculated or obtained from the charge controller manual.

With a pulse width modulated pwn charge controller the worst case amps flowing to and from the controller are the same so the fuse and wire size can match. With 10a fuse you could deliver 120w before it breaks. First between the charge controller and battery bank second between the charge controller and solar panels and third would be between the battery bank and inverter to determine the fuse size needed between the charge controller and battery bank you simply match the amperage rating on the charge controller. As an example blue sky recommends a 60 amp fuse breaker for their solar.

For that setup you will not need fuses between the solar panels and the charge controller. Jst ensure you use appropriate wire gauge.