I power my cabin with one 80W solar panel and two, 6 volt, deep cycle batteries. I'm having trouble keeping my batteries charged and bought another 85W panel. My original panel is 7 years old. As I was hooking them up (in parallel) I read the voltage on each panel. The new panel read 20V and the old one only 13V. I understand that I'm going to gain charging current by adding the second panel but I'm worried that this disparity in voltage will limit my gain or cause some other trouble.
Two questions:
1. Why is there such a difference in voltage from these two, very similar, exactly same sized panels?
2. Will the low voltage from the old panel reduce the effectiveness of my new configuration or vice versa, will the high voltage from the new panel reduce the total current?
Thanks
Two questions:
1. Why is there such a difference in voltage from these two, very similar, exactly same sized panels?
2. Will the low voltage from the old panel reduce the effectiveness of my new configuration or vice versa, will the high voltage from the new panel reduce the total current?
Thanks