Series Fuse Rating Solar Panels

Fusing solar panel arrays wired in parallel.

Series fuse rating solar panels.

Mnepv breakers are available in a 6 a rating and that size breaker should not be subject to nuisance tripping. 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. 8 87a x 2 strings x 1 25 22 18a 15a fail. 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. 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. When we talk about solar panel ratings we most often talk about wattage. If each module s short circuit current is 4 2 amps then you could parallel 3 modules.

The fuse ampacity rating ifuse should be equal to or less than the cable current rating icable at the maximum ambient temperature. So you could safely wire 12 8 amps of modules together in parallel. In this case the battery wires and ac dc inverter will be safely disabled by the fuse. We then take the total amperage and multiply it by a safety factor of 25 5a x 1 25 giving us the fuse rating of 6 25a or 10a if we round up.

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. Kauaisolarman s hit 190 pvs have an isc rating of 3 75 a and a stated maximum series fuse rating of 15 a. Spec sheet so here we go the different categories of solar panel ratings. Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow.

This means each seriesneeds a fuse breaker placed in the combiner box as shown here. If a module s series fuse rating is 20 amps then you divide that by the combined safety factor of 1 56.