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You need at least 3 solar panels, one for each battery, and a voltage regulator. The largest panel you can find. All 3 panels can be put in a rack together flat on the roof and screwed to the trusses on the roof. The solar panels will probably only have full output between 11 and 1 because they are mounted flat on the roof.
You can drill through the sewer vent pipe on the roof and run the wire down the pipe and drill another hole in the sewer vent pipe in the basement and run that wire to your batteries. The voltage regulator is needed so that the voltage regulator will shut off the solar panels when the batteries are fully charged.
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