wiseacre
Solar Enthusiast
I feel like I'm on the verge of understanding but I still don't quite get how to size a MPPT charge controller.
While my solar panels will remain the same I will be adding more.
I will be upgrading my (2) Gel 12v, 100Ah batteries in series (24v) to a LiFePO4 24v, 200Ah battery (EG4 formally known as Gyll
The battery bank will be added to as my budget allows
In total my array will become over time 12 panels (8 now) ~ 195w panels
Panels are paired in series going to a combiner box - ? 2s4p ? (future array 2s6p)
I would like to keep that configuration because I've built an adjustable frame for tilt with each series pair as a unit. It's possible to reconfigure the panels as long as I watch out for the cables as I adjust each pair.
Off hand I calculate each panel's volts as 25v to compensate for -40 winter temps.
12 panels:
x 25v = 300v -(this seems high so I figure I'm wrong here)
x 195w = 2340w -(I've seen watt limits on chargers and that confuses me too, I thought the main consideration was the panels' voltage going in)
Now what to do with those numbers? or am I on the wrong tract entirely?
Using the combiner box is what really confuses me. I love the fuses on each string and the breaker for the output (plus the other doohickeys in the box)
I kind of know what's going in but what comes out is beyond me at the moment.
My rough figure is each string 2s = appx 50v, 10a
I currently have 4 strings (with room for 6 total I plan on taking advantage of)
Any thoughts, comments and explanations are welcome. Who knows what tidbit of info will click in my brain
Nurse! Nurse! My brain hurts!
While my solar panels will remain the same I will be adding more.
I will be upgrading my (2) Gel 12v, 100Ah batteries in series (24v) to a LiFePO4 24v, 200Ah battery (EG4 formally known as Gyll
The battery bank will be added to as my budget allows
In total my array will become over time 12 panels (8 now) ~ 195w panels
Panels are paired in series going to a combiner box - ? 2s4p ? (future array 2s6p)
I would like to keep that configuration because I've built an adjustable frame for tilt with each series pair as a unit. It's possible to reconfigure the panels as long as I watch out for the cables as I adjust each pair.
Off hand I calculate each panel's volts as 25v to compensate for -40 winter temps.
12 panels:
x 25v = 300v -(this seems high so I figure I'm wrong here)
x 195w = 2340w -(I've seen watt limits on chargers and that confuses me too, I thought the main consideration was the panels' voltage going in)
Now what to do with those numbers? or am I on the wrong tract entirely?
Using the combiner box is what really confuses me. I love the fuses on each string and the breaker for the output (plus the other doohickeys in the box)
I kind of know what's going in but what comes out is beyond me at the moment.
My rough figure is each string 2s = appx 50v, 10a
I currently have 4 strings (with room for 6 total I plan on taking advantage of)
Any thoughts, comments and explanations are welcome. Who knows what tidbit of info will click in my brain
Nurse! Nurse! My brain hurts!