One thing everyone should know about our inverters is when charging either by being connected to shore power or receiving power from the generator they both have the ability to supply charging current to the batteries at the same time. They may charge equally as Gary has indicated, or one may handle the load. If there is ever any question about whether both are working because one always seems to carry the charging load, turn it off and see if the other one starts to pick up the charging load. You should be able to see on the remote panel when the inverters are charging, but if you want to verify it, hook your voltmeter to the house batteries and check the voltage with one or the other turned off. As long as the batteries are receiving a charge the voltage will be well in excess of 13 volts and possibly as high as 14.3 volts depending on where the inverter(s) are in the charging cycle.

A set of batteries not being charged will fall back to 12.7 volts or lower depending on their state of charge.

There is also a misconception that if a bus has two inverters the available power for 120V AC electric devices is their combined wattage and that they supply 120 V AC power together like they do on the 12 or 24 V DC output. Not true. Well, almost not true.

The inverter output when functioning as chargers can be combined and is combined.

The AC (alternating current) output on the 120V side is not combined. Each inverter either passes through shore or generator power to the circuits it is dedicated to power, or in the absence of generator or shore power converts battery power to supply 120 V AC power to the dedicated circuits and those circuits are isolated from one another. You cannot combine the outputs of two inverters to create one single circuit. The must always remain isolated. If your coach is set up with 2500 watt inverters for example, and one inverter has outlets, a refrigerator and an air conditioner on its circuits, the combined amperage or wattage for all circuits supplied by the inverter must not exceed the inverter rating. A 2500 watt inverter therefore can only supply 2500 watts of output power, or a little more than 20 amps total. Since a typical air conditioner will draw 13 amps when running there is not much additional capacity, and a refrigerator, or the TV's may exceed the output if added.