Looks like that's basically just a battery bank and an inverter all in a box. You could probably spend the same money outfitting your MH with an equivalent solar setup/battery bank/inverter and then keep the Onan for emergency in those times the sun just doesn't want to be sunny enough.
You'll go green by using the Onan less, but you'll keep the functionality for those times you really need it.
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There's no use crying over spilled milk, unless it's on your keyboard.