A few more questions about solar panels...
As you may recall...I had some issues with my solar panels/batteries a few weeks ago. https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30348700.cfm I've since bought a new controller (beca...
Forum Discussion
I have two 12V panels...not a 20.8 and a 22.6...they are both considered as 12V panels.That's Voc (open circuit) which is useful for testing panels. Vmp (maximum power) is used for power along with Imp. Voc and Isc (short circuit) are useful for testing a panel.
12V panels are generally 36 cells and Vmp is 18-20V. They are used as one or in parallel to charge 12V batteries with a PWM controller. The wiring loss is much less of a factor as long as the maximum battery charging voltage is maintained which is usually 14.4-14.8V. Panel temperature is another consideration.
72 cell panels can charge a 24V battery. 60 cell panels provide very limited voltage drop for 24V batteries.
