I have about 10KW of lithium ion 36V hoverboard batteries that I want to connect to my 12V AGM battery in my Prius.
I am placing several 18V solar panels in parallel instead of series on the roof of my Prius due to varied shading conditions across each panel.
I cannot find a good charge controller that will allow a step-up charge into 36V at the expected parallel currents, so I must charge the 12V battery directly from the solar panels using a typical charge controller and then use that to power an inverter that will be connected to a normal 36V li-ion charger to use on the lithium battery cluster, which will then be looped back into the AGM battery for extra capacity.
I am not sure the best way to charge the AGM pack via the lithium pack.
Should I get another charge controller and use the lithium output as the 'solar' voltage or is there a better (cheaper) way?
As a side note, the purpose of this set-up is not to add power to the motive portion of the car, it's to power the inverter and add the capacity of the 36v pack to the 12v battery.