Illustrated Guide to Solar Installations on Boats

[Quebramar]

Pardon my ignorance... could you explain me the fuse rating? why a 40A fuse for the MPPT that is rated 30A? Is the latter well protected with such fuse?
Thanks

[Randy P]

Oops. My bad. It’s a 30A breaker between the PV and MPPT.. Max fuse per panel is 15A and there are 2 wired in parallel. There is also a 30A inline fuse off the panel wire combine before it comes into the cabin. Belts and suspenders, I suppose. Thanks for noticing.

[mitiempo]

Originally Posted by Quebramar

Pardon my ignorance... could you explain me the fuse rating? why a 40A fuse for the MPPT that is rated 30A? Is the latter well protected with such fuse?
Thanks

The fuse protects the wire. It should be sized higher than max load and lower than the wire's ampacity.