Life on the road: RV Living
Battery Charger To recharge our three 12V 120 amp/hr Lifeline batteries properly, we have a 35amp/hr battery charger that runs off the generators or off power if we are connected. We also charge our batteries off the car electrical system by using a Redarc DC to DC battery charger that gets hook up to our trailer every time we take off. The system that comes with all trucks doesn't work, so don't believe what the sales people tell you. When charging from an external power supply like 110v or your generator, you may notice that it takes a long time to charge your batteries. The modern Smart Converters are not all that smart. They take the incoming power and distribute the power to the inside of your RV or Trailer first and the residual power then goes to charging your batteries at a rate no greater than 7 amps. So if your batteries are well down it may take several days to bring them back to a full charge. Even an overnight stop being hooked up may not solve your battery...