Sizing Solar Panel Fuses

Maxi fuses are typically used for charge controllers or smaller inverters.

Sizing solar panel fuses.

Solar panel fusing commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow. A solar fuse is a special purpose fuse used in photovoltaic pv or solar power systems. A wide range of voltage ratings and ampere ratings determine the solar panel fuse size. If the panels are connected in series the voltage of each panel is added but the amperage stays the same.

Click on calculate to see the size wire required in awg american wire gauge. A spare fuse is recommended with with the purchase of a fuse holder. The midget fuse sizes operate from 600 to 1500. Enter the distance in feet from your solar panels to your battery bank charge controller.

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. Enter solar panel output voltage. This means each seriesneeds a fuse breaker placed in the combiner box as shown here. If you connect these panels in series there will be no increase in current flow so fusing is not required for this string.

Usually 12 24 or 48 volts. Atc fuses are used for dc loads. Mini fuses are typically used for small system components like battery management systems or monitors.