Series Fuse Rating Solar Panels

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

Series fuse rating solar panels.

If you connect these panels in series there will be no increase in current flow so fusing is not required for this string. 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. If a fault occurs in one string would there be a need for each string in the system to be fused in order to protect the circuit. Mnepv breakers are available in a 6 a rating and that size breaker should not be subject to nuisance tripping.

Spec sheet so here we go the different categories of solar panel ratings. For example if you have four 100w panels connected in series each producing 20 volts and 5 amps the total output would be 80 volts and 5 amps. Fusing solar panel arrays wired in parallel. If a module s series fuse rating is 20 amps then you divide that by the combined safety factor of 1 56.

In this case the battery wires and ac dc inverter will be safely disabled by the fuse. The fuse ampacity rating ifuse should be equal to or less than the cable current rating icable at the maximum ambient temperature. Kauaisolarman s hit 190 pvs have an isc rating of 3 75 a and a stated maximum series fuse rating of 15 a. When we talk about solar panel ratings we most often talk about wattage.

This means each seriesneeds a fuse breaker placed in the combiner box as shown here. It has an isc rating of 8 87 amps and a fuse rating of 15 amps. As i read it a 15 a dc breaker would be safe and the minimum size would be 6 a 3 75 x 1 56 and rounded up. If up to two solar panels or solar strings are connected in parallel and the cable is rated below 1 56 isc a fuse connected in series to the panel must be installed.

So you could safely wire 12 8 amps of modules together in parallel. 8 87a x 2 strings x 1 25 22 18a 15a fail.