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.
Choosing fuse for solar panel.
The second fuse between your solar panels and charge controller is a little bit different to figure out.
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This means each series needs a fuse breaker placed in the combiner box as shown here.
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If the panels are connected in series the voltage of each panel is added but the amperage stays the same.
Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow.
If you connect these panels in series there will be no increase in current flow so fusing is not required for this string.
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Fusing solar panel arrays wired in parallel.
They have a breaking amperage of 10 000 a and dc voltage rating up to 150 v.
The size of this fuse is dependent on how many solar panels you have and how they are connected series parallel or series parallel.
Mnepv breakers mount in a standardized din rail box and are available up to 63 a.
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