I recently traveled to Julian, California to install a complete solar system on a 38' Montana 5th wheel RV trailer. The system includes 3 Overlander-170 watt solar panels, four new East Penn Deka batteries, and a GP-IC-3000 Inverter / Charger. The 3000 watt inverter is wired in pass through mode so every time the shore power or generator is used the GP-IC-3000 Inverter / Charger will quick charge the batteries with the built-in 125 amp battery charger. With four batteries, every appliance in the RV can be operated except for the air conditioner. The generator or shore power is required to operate the air conditioner. The customers are leaving soon for a 18 month road trip.