Sounds ambitious, but doable. You will find others on this site who have first hand knowledge with a boat tail add on.
I have a 15w panel on my dash that keeps keeps my battery at full charge, which is useful as my cars factory alarm and various components such as ecu ect.. slowly drain off my battery noticeable without the panel in place.
I leave my car for days at a time without driving it.
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Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
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