What I have is a Renogy MPPT charge controller 12v/24v, 3000w pure sine inverter, 2-12v 200amp LifeP04 batteries. Just got the second battery and want to put them in series to get 24v charge to the batteries from the controller. Now I realize that the only way is to feed off one battery for the 12v. Don’t know if this will work. If not I’ll have to connect the batteries in parallel. Wanted the 24v so I could have more leeway in the solar wattage. With the 12v I think I’m limited to 800w input. Really don’t want to buy another inverter.