Archived Tech Tip: 09/05/08

Inverter

The inverter works two ways: first by switching battery DC voltage into a synthesized AC voltage to run large electrical items, and second, as a charger to replenish the batteries when the generator is running or the RV is plugged into shore power.

The inverter is located in an outside storage bay. A communication cable between the inverter and the indoor panel allows the system to be operated from inside the RV. An on/off switch can generally be found in the cockpit overhead or on the monitor panel in the hallway. The communication cable is protected against shorts by auto-reset fuses located inside the inverter. If the cable is malfunctioning, the inverter will shut down.

The inverter requires battery power to operate, and although the draw is minimal, when other electrical loads are competing for power, battery discharge can quickly add up. When shore power is not available and the generator is off, it is recommended to turn the inverter off when not in use to help conserve battery power. Units equipped with a residential refrigerator and/or all-electric systems must leave the inverter on at all times and subsidize battery draw by operating the generator or plugging into shore power.

Low and high battery voltage can affect inverter operation and cause erratic appliance operation. For best results, maintain the battery voltage above 12.25 VDC (50% of charge) and assure all cables and connections remain secure and free of corrosion.

The inverter is designed with an overheat protection system to turn the component off if necessary. Refrain from storing cargo around the inverter that will reduce the required airflow. Prevent water from coming into contact with the inverter by securely closing the bay door during rain showers and avoiding a direct stream of water into the bay when washing the RV.

Two types of inverter waveforms are available: Modified Sine Wave and Pure Sine Wave. Pure Sine Wave offers a cleaner power and enables large loads to run more efficiently. Certain Modified Sine Wave systems may create electrical noise, can cause some motors to draw more power and not as successfully manage sensitive items such as computers, printers or medical equipment.

Inverter after market installations are available for motor homes and travel trailers. The inverter should be installed on a flat surface away from the engine compartment to avoid fluid contamination and excess heat. See your selling dealer for further details.