I built 5, 60w solar panels. Checked voltage before & after mounting on roof. Each produced 18.5v or more. Since i live at 41 degrees N. lat. I mounted them facing due south and at 41 degrees. They only produced about 14v at noon. I played with the angle and found 13 degrees worked best. They've been in service 6 wks now and I've noticed that they charge best from 7:00 to 10:00 am. And here is the wierd thing. On sunny days, they can barely charge 4, 35ah batteries to capacity. But on… Continue