Sorry folks. Give me your Brand and Model of Genset. NONE of the RV Onan Gensets all the way to 12.5k have NO battery charge module. AND the few Powertech Gensets, that DID have a module was ONLY to keep the genset RUNNING, not to charge any battery bank. Now, A LOT, of Class A motorhomes have a 120 Battery TENDER/Minder connected to the chassis battery bank and that will keep the Chassis charged, but it requires either 120 Shore Power or genset, BUT, as I stated, the Genset does NOT have the equipment to charge, It just powers the add on charging system. Doug