Solar Panel Fuse Rating

This means each seriesneeds a fuse breaker placed in the combiner box as shown here.

Solar panel fuse rating.

The class r fuse size operates at 600 vdc and from 20 to 400 amps. Fusing solar panel arrays wired in parallel 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. The midget fuse sizes operate from 600 to 1500 vdc and are available in 1 to 32 amps. What you need to know helping you understand what solar panel ratings are and why they are important to you.

Maybe you opened up a solar panel s spec sheet and quickly spiraled into confusion because of words like wattage efficiency power tolerance and temperature coefficient what do all these mean. If you connect these panels in series there will be no increase in current flow so fusing is not required for this string. To determine the fuse size needed between the charge controller and battery bank you simply match the amperage rating on the charge controller. For instance if you have one of our 40amp charge controllers we would recommend using an 40amp fuse.

Solar panel fusing commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow.