If you connect these panels in series there will be no increase in current flow so fusing is not required for this string.
Inline fuse for solar panel.
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.
40a inline circuit breaker reset fuse 12v 24v dc reset fuse holder 40 amp with manual reset for car audio stereo switch and solar inverter system 2 pack 3 8 out of 5 stars 240 17 99 17.
Fusing solar panel arrays wired in parallel.
Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow.
We recommend adding two different fuses in the following scenarios.
In this case the battery wires and ac dc inverter will be safely disabled by the fuse.
If the panels are connected in series the voltage of each panel is added but the amperage stays the same.
This means each series needs a fuse breaker placed in the combiner box as shown here.
It is not mandatory to have fuses for your system to function properly.
However we do recommend to add fuses to prevent any mishaps.
The second fuse between your solar panels and charge controller is a little bit different to figure out.