Hi,
What you want to do is possible with a hybrid inverter/charger, but with a twist.
I am often in situations where I wish to do voltage support due to low shore power voltage. I found out that if I "dial down" the allowable amperage enough then the voltage is supported. My solar panels send energy to the battery bank--and the 120 volts AC power systems in the RV draw from the inverter.
I have done the same thing with the generator, just as a test.
I don't really understand why you are attempting to do this, unless it is because the battery bank is fully charged and you wish to continue to harvest the maximum amount of energy you can from the panels.
If that is the case, with some charge controllers you can do a diversion load and send the extra harvest to a 12 volt element in the water heater.
Grid tied inverters require a source of 240 volt AC power before they will transfer energy from the panels into the grid.
