Smart Solar Charge Controller 100/50 Over Current Clipping

[Rottieguy]

I agree that the 48V version of the Multiplus 2 would be the most efficient and expandible for the future, but that also require another solar controller as my present 100/50 is only capable of charging up to a 24V battery array. My plan is to upgrade to two 150/70’s for a total of 140 amps which would be close to a 1c charging rate in a 8 -12V battery array in 4S 2P. However, that would be reasonable in a 2S 4P array. I also wanted to mention that while reviewing solar charger history I saw peaks of 95V when the controller shut down charging after absorption cycle completed and the only load was the Giandel inverter stand by. Yikes! It’s not even cold here. Another thing of note is when I discharged my system hard, down to 12.5 resting, when I had great sunshine day and the Solar Controller was pushing 48 amps @ 12V for hours, the 150/50 controller got way hot, I didn’t get a chance to use my Fluke IR but it was almost too hot to touch to me which tells me it was well above 140F. That’s just too hot for electronics to function for hours and hours… The plan for now is to switch to 24V and watch the temps drop at the controller and switch to a 150/70 (or two if I can get my Fire Fighter Stepson to help me out getting my other 4 panels up on the roof) for a max of 140 amps for the 400ah battery array. I wish I could edit my Over Volt post to post my new findings, but it’s been closed. Just something to rattle around a person’s mind is that these Renogy panels “Over Perform” in every aspect and to be aware when selecting a solar controller. They are rated at 23V Voc, I’m seeing close to 24 @ 70F ambient air temp.