Walmart sellsĀ a smart 3 stage charge controller. It does bulk to 80% then slower to 98% then trickle and maintenance to 100%
https://www.walmart.com/ip/Schumacher-SPC-7A-Solar-Charge-Controller/23326433
That is a 7Amp you may need a bigger one. They sell larger ones.
https://blog.larrydgray.net
