Series Fuse Rating Solar Panels

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.

Series fuse rating solar panels.

Fusing solar panel arrays wired in parallel. The fuse ampacity rating ifuse should be equal to or less than the cable current rating icable at the maximum ambient temperature. 8 87a x 2 strings x 1 25 22 18a 15a fail. Spec sheet so here we go the different categories of solar panel ratings.

If you connect these panels in series there will be no increase in current flow so fusing is not required for this string. In this case the battery wires and ac dc inverter will be safely disabled by the fuse. If a module s series fuse rating is 20 amps then you divide that by the combined safety factor of 1 56. 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.

Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow. Kauaisolarman s hit 190 pvs have an isc rating of 3 75 a and a stated maximum series fuse rating of 15 a. If each module s short circuit current is 4 2 amps then you could parallel 3 modules. Mnepv breakers are available in a 6 a rating and that size breaker should not be subject to nuisance tripping.

When we talk about solar panel ratings we most often talk about wattage. It has an isc rating of 8 87 amps and a fuse rating of 15 amps. If you want to compare your own solar panels you can find all the different ratings on their specification sheet a k a. 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.

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