NPhil
Freezing in the dark non-enthusiast
- Joined
- Apr 23, 2021
- Messages
- 219
I have a "mobile solar power testbed" (a system in development which is also a lab, for my education, comprised of odds and ends stuffed into and attached onto an old minivan) which, this morning has 6 (most days it's 4, but today is cloudy) Newpowa 100S-12H panels on top. I run a 24V Lithium battery system (at about 26.3 when the test was run), using a Epever Tracer AN 40A controller, and have been attaching panels in pairs. So, I had 2S 3P up there today, and about 1.5A at 27.8V coming in (normally, it's nearer 10A, with 4 panels), so I thought this medium heavy cloud cover might be one of those edge cases where I will see the, eh, light on recommendations I have heard for more panels in series for better performance, specifically 3S in preference to 2S, especially on a 24V system. So, I changed 3 pairs of panels to 2 triptychs of panels (artfully, of course), and output dropped to 1A, at about the same voltage. I changed back to 3 pairs, of course, and back to around 1.5A. It's anecdotal, of course, but, I wonder why?