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You shouldn't have a dead battery after only a few days. Harbor Freight has some that are around $20 I think. Not sure but you might want one with some kind of controller that won't over charge the battery if it gets a lot of sun one day. A disconnect switch might be a good alternative.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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