shadowsteve
Solar Enthusiast
- Joined
- Feb 11, 2021
- Messages
- 265
I'm changing out my 6 yr old AGM batteries (fifth wheel trailer) for Lithium and this means that my onboard DC charger likely won't be able to properly charge the batteries as it has no profile for Lithium.
The system is currently 640w solar into a Rover 40A MPPT to 4x Fullriver AGM and I have a Xantrex 2kw PSW inverter. At some point I may change to an inverter/charger but as the 2kw supports our needs I'm in no rush. I thought about using a DC-DC charger to connect to the existing trailer DC charger and then support the Lithium that way and then I figured that an MPPT controller is basically a DC-DC charger anyway. I have a spare EPSolar (Renogy) 40A MPPT CC and thought maybe I could feed the 12v input from the existing DC charger into it as if it came from panels and the CC would then boost it for charging?
Does this sound reasonable?
The system is currently 640w solar into a Rover 40A MPPT to 4x Fullriver AGM and I have a Xantrex 2kw PSW inverter. At some point I may change to an inverter/charger but as the 2kw supports our needs I'm in no rush. I thought about using a DC-DC charger to connect to the existing trailer DC charger and then support the Lithium that way and then I figured that an MPPT controller is basically a DC-DC charger anyway. I have a spare EPSolar (Renogy) 40A MPPT CC and thought maybe I could feed the 12v input from the existing DC charger into it as if it came from panels and the CC would then boost it for charging?
Does this sound reasonable?