NOT recommended: Renogy Rover Elite solar charge controller

Reasons not to get involved with the Rover Elite controllers from Renogy.  the setpoints are unconfigurable, except for the Absorption setting in Li mode even in that mode Vabs is settable only in .2v increments the cable interface (or chip behind it) is nonstandard for Renogy (and its sources).  The external display for it costs more than the options on

solar charge controller analogies

I was in a weird mood today: PWM is like a turtle on its back when battery voltage is low. It struggles until it can get back on its feet, after which everything is fine. Adding in isolator charging turns the turtle over and onto his feet. Example: When the battery is 10.5v a 100w