you want to Assist the honda ?
to do what power an A/C unit ?
you could try a cheap ? grid tie inverter
it might work with the honda as it has a clean sine wave
solar panel to grid tie inverter ( panel and inverter have to match )
panel has to be in the voltage range the grid tie inverter accepts
this is not a 12v system
inverter will only operate IF it sense 120v power on the utility connection
i don't see any other way to do it
but to do anything meaningful will require a lot of solar
unlike batteries or generator
Solar has NO surge capability
100 or 200watt of solar is unlikely to help the honda power anything that is too large a load
this will take a sufficient solar array to supply the ended extra power
a hybrid inverter charger with power assist is possibly the best option
and that will founder when the first cloud passes over the panels
but if you try this idea of yours, using the grid tie inverter
please report back
BTW.. you can't have an open ended circuit with grid tie
you can't connect to a non-running generator
if the Honda is not running the grid tie will shut off
you can't connect to a generator that is NOT powering some load that will take the power from the inverter
grid tie are designed to send power to the grid, out to the utility lines into the transformers or the neighbors meter where they get billed for it
don't know how well they will work in an opened ended system
