Well I bought a JustNow 200 watt solar panel and just hooked it up to my ac180. I had the ac180 in the house and ran a 20 ft cable between the panels and the ac180. It is currently around -2 f, in the last week we have been hit with a couple of nasty snow storms here in Des Moines, IA. I pulled in between 125-135 watts and this is a 20 volt, 10 amp panel. The only complaint about the panel so far is that a rivet was damaged on one of the straps that keep it closed. Not a question per se, just reporting info.
Terry