Fusing solar panel arrays wired in parallel.
Inline fuse for solar panel.
The size of this fuse is dependent on how many solar panels you have and how they are connected series parallel or series parallel.
Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow.
In this case the battery wires and ac dc inverter will be safely disabled by the fuse.
If you connect these panels in series there will be no increase in current flow so fusing is not required for this string.
If the panels are connected in series the voltage of each panel is added but the amperage stays the same.
The second fuse between your solar panels and charge controller is a little bit different to figure out.
Between the charge controller and battery bank solar connector inline fuse between the charge controller and solar panels anl fuse set fuse.
It is not mandatory to have fuses for your system to function properly.
Now in the case of 3 panels in series and 4 strings in parallel if one string shorts the max amperage to short is 39 12 which exceeds the 30 amp max current rating of the 10 awg wire.
Witproton solar pv fuse connector ip68 waterproof 1000v in line fuse holder for solar panel and inverter in photovoltaic system male female with 1 fuse 30amp fuse connector 4 3 out of 5 stars 6 15 99 15.
However we do recommend to add fuses to prevent any mishaps.