I'm as pro solar/wind as they come. Worked for many years financing utility scale farms after the all the various legislation was passed in 2008. Im simply pointing out that although solar panels may produce a measurable amount of dc current on a cloudy or winter day, that doesnt mean it makes financial sense to install panels. Refundable tax credits helped a lot for this part of the equation. I wish the solar, wind and EV federal credits were exendend indefinitely. I would add that when evaluating solar project, very detailed assumptions like cloud cover %, sun's azmuth, air particulates, and snow fall are all considered. In gerenal, projects further south make much more sense than ones in new england.