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Need help driving N FET gate from LM393 comparator output

I am working on a charge controller circuit idea I had. The circuit 'works' meaning it achieved desired output voltage but the fet doesn't seem to be turning all the way on so lots of heat is ...
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How and when can solar charge controllers be stacked together?

I run a small busniness selling solar charge controllers. Often I have a problem with not having controllers rated high enough amp-wise. I know that charge controllers can be stacked. But can all be ...