How to choose subcombiner box switch for inverters?

This very specific question is very easy to answer. You will need to know the short circuit current of the panels you are using. Since the panels are connected in series in one string, then the current output of your string is  same as the short circuit current of one panel.

If there’s string combiner box, then you have to multiply the number of strings going into the combiner box by the short circuit current (since strings are connected in parallel in each combiner box).

If there’s no string combiner box, then you should only use the short circuit current of the panel.

The number you get for each of the case, should be multiplied by a number between 1.25-1.5; this is the amperage of the switch you use for subcombiner box switch in the inverter. You may need to choose an inverter with more than subcombiner switch.

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