I finally pulled the trigger and ordered a factory built steel-cased LiFePo battery with 400ah capacity and bms. I plan to install the battery under the bed and upgrade the inverter from the original Xantrex, also under the bed.
What I'm not sure about yet is how to connect to the existing system? I'm leaning towards rerouting my solar wires and repositioning mppt charge controller from the outside battery compartment to under the bed. I will need to figure out how to find the original charger/converter to redirect (or add wires) to the new battery. Does anyone here have experience with the Alante or Precept motorhomes and can tell me where to look and what it looks like? Other option is to install the 40A charger the battery manufacturer is including, but how difficult or unwise is it too run two charges to two different sets of batteries? That would allow me to keep two of the 12v oem batteries as backups?