My travel trailer RV is currently running on AGM batteries, but I'm in the process of making the switch to LiFePO4. My truck provides 12v charging through pin 4 of the 7pin trailer plug. My question is, will I need to install a DC-DC charger when making the switch to lithium? There are two concerns that prompt this question. First I've heard that trying to charge from the 12v on pin 4 can overwork and cause early damage to the alternator. Second, the voltage provided by the alternator and starting batteries may not be sufficient to top off the lithium batteries while driving.
The initial conversion will include an Inverter-Charger but no Solar initially. So while I don't immediately need MPPT functionality I'm not opposed to it if something like the Renogy DC2DC with MPPT is the recommendation.
The initial conversion will include an Inverter-Charger but no Solar initially. So while I don't immediately need MPPT functionality I'm not opposed to it if something like the Renogy DC2DC with MPPT is the recommendation.