First between the charge controller and battery bank second between the charge controller and solar panels and third would be between the battery bank and inverter to determine the fuse size needed between the charge controller and battery bank you simply match the amperage rating on the charge controller.
Choosing fuse for solar panel.
The midget fuse sizes operate from 600 to 1500 vdc and are available in 1 to 32 amps.
The class r fuse size operates at 600 vdc and from 20 to 400 amps.
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Fusing solar panel arrays wired in parallel.
In a parallel system a combiner box is used that holds the fuses breakers to each panel plus one or more combined fuse leading to the charge controller or grid tie inverter see figure.
A wide range of voltage ratings and ampere ratings determine the solar panel fuse size.
Atc fuses are used for dc loads.
This means each series needs a fuse breaker placed in the combiner box as shown here.
There are three different locations that we recommend installing fuses or breakers.
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Maxi fuses are typically used for charge controllers or smaller inverters.
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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.
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If your panels are smaller than 50 watts and use only 12 gauge wires and 20 amp fuses are required.
Class t fuses are used as circuit protection between a battery bank and an inverter.
So the 86 4 volts is under the safe threshold of the 100 max volts of the victron smartsolar mppt 100 30 solar.
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Since they are wired in series the voltages get added together for a total of 86 4 volts.
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