I have bought them fron "Harbor Fright" too. My only reservation with using solar is usually they have no way to cut off the charge when the battery is up. This can give you premature battery failure. ...J.D.
If you are worried about over charging, Harbor Freight also has a Solar Charge Regulator you can wire between. Part #96728 for about $10.
You said garage? Might not even be enough sun light to over charge or worry about even if it is open walled.
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