15 amp Adjustable Voltage Regulator

I designed this original to run 12v devices on my 20v solar panels, but it can be used to step down voltage up 36v. I can charge my RC batteries on my Graupner charger with my 160w panel only. Most solar chargers require a battery but this solar controller does not.

15 amp Adjustable Voltage Regulator: https://www.amazon.com/gp/product/B00C9UUFHC/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=ericsdiy714-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00C9UUFHC&linkId=4e6721aa5ee896a68ed819f