I’m looking to use P and N type FETs to disconnect the panel in case I need to disconnect the battery. Is there already protection that would prevent reverse current in the PV input protection? The FETs wouldn’t cover this edge case on their own because of the body diode action
I’m looking at the smart solar 100/20 if model matters
The PV input circuit of the typical MPPT has an N type Fet (source -ve, drain +ve PV in) acrsoo the input for Over voltage protection, and incidentally reverse polarity protection.
Adding an external switch should not cause a reverse current. better to use an adequately rated circuit breaker then a FET.
Thanks!
I get that breakers are going to be more reliable, and they’re designed for this exact application. I designed some FET modules for a fusebox project and figured they could work here too. Half the goal of this project is to gain experience and knowledge, so thanks to you, mission accomplished
Better yet, instead of a FET, I’ll bypass the chips and pull-fuse disconnect
You’re right, a FET would be an unnecessary risk
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