Hi,
The Trace M2512 inverter can do what you are asking. It will sync with the generator output, and then if you tell the remote panel you are plugged into a 15 amp receptacle, and your load through the inverter is say 10 amps, it will use up to 5 amps to recharge the battery.
Should you decide to have 3 or 4 amps on and then start the air conditioner, the inverter will make all the required power beyond the 15 amps passed through from the generator or shore power, and go back to charging the battery once the load is less than 15 amps. So in theory, if you have a 200+ watt solar system, and at least 440 amp hour battery bank to draw from the Trace 2512 inverter will take that 12 volt power and make whatever additional power is required to run the RV load until the battery is depleted, up to the 2500 watt capacity, and also can put out a 4,000 watt peak surge for start up of something like the compressor.
Yes it would work better to use something like the Trace 4024 inverter, or the 4048 inverter, with 24 and 48 volt battery bank respectively. There is one solar powered house in Florida using high efficiency air conditioners and pairs of Trace 5548 inverters to run the 4 ton A/C units during a power failure. The back up generator only needs to run at night, or when the battery bank is low. There was a write up about this system, owned by a retired Ford executive in Home Power Magazine many years ago.
You might call the knowledgeable people at
ElectronConnection.com to see what modern inverters will also do what you are asking for.
My next inverter will probably be a 8,000 watt Outback inverter connected to a 48 volt battery bank, and some medical equipment. It will be in a house serving some terminally ill children, and they do have some needs that need to be met 24/7. It will also have a 2-3 KW 48 volt solar system, so the house can run 24/7 for weeks without needing to run out and get a generator.
Fred.
