For what it is worth, I have a portable panel where the controller is mounted under the panel, semi-protected from the rain. And then I put a stout small ziploc bag around the controller for extra protection -- it does not appear to retain heat.
So far, so good -- it has made it ok through several thunderstorms.
But a really waterproof unit would be better -- I would not have to worry at all.
Man, do I love that little 120 watt panel. We just spent a month of boondocking and never had to fire up the generator once! What a luxury to be able to turn on as many lights as we want. (All LED, and of course we turn them off when not needed.)
