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tahoematt avatar image
tahoematt asked

Fuse size for MPPT 100/50

Iโ€™m installing a mppt 100/50 in a van build. I have 3 -180 watt panels wired in a series. I have a 15amp dipole disconnect between mppt and the panels but what size fuse should I use between the busbar and the mppt? I was guessing 75amps or 100??

MPPT Controllersfuses
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Vance Mitchell avatar image
Vance Mitchell answered ยท

It depends on the cabling that you are using between the busbar and the MPPT.

Generally I would use around 150% of expected max current (75A in this case) as a guide but only if cabling is sized to suit.

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tahoematt avatar image tahoematt commented ยท

I plan to use 4AWG - will that fit? So 75amp fuse?

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Vance Mitchell avatar image Vance Mitchell tahoematt commented ยท

6awg is the largest that will fit the terminals on a 100/50 and that would be fine with a 75A fuse.

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