Fuse Between Solar Panel And Charge Controller

Mini fuses are typically used for small system components like battery management systems or monitors.

Fuse between solar panel and charge controller.

Class t fuses are used as circuit protection between a battery bank and an inverter. 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. Jst ensure you use appropriate wire gauge. For that setup you will not need fuses between the solar panels and the charge controller.

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. There are three different locations that we recommend installing fuses or breakers. 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. 10a car fuses are fine for that.

As an example blue sky recommends a 60 amp fuse breaker for their solar. 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.