An Onan and 800AH of batteries and Solar, you must be preparing for doomsday. That is a lot of added weight as well as redundancy. If you have the Onan 5500 with solar you can easily get by with 1/2 the AH of batteries. That combination will be close to 1000lb of added pin weight also. If you go with 800AH of batteries scratch the Onan and buy a small portable just for back up charging.
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