Post #9624

I always do the actual calculation but here's a handy dandy chart for calculating the increase in voltage (Voc) of solar panels. It is important to recognize that cold panels make a higher voltage than warm panels and when figuring out what voltage the array will make when the first beam of sunlight strikes the panels on a cold winter morning. Example: you have a panel that says 45.5Voc and the coldest record temperature in your area is 5F (-15C). Multiply the panel voltage by 1.16. 45.5Voc becomes 52.78. So if you thought you had 45v panels and could put 10 of them in series to your EG4 inverter that was rated for 500v, you'd be wrong on a cold winter day.