Tractor solar battery charger



I've got a tractor that only gets run ~4hrs/3months(not at home). The
battery can't stay charged up and I have no electricity in the vicinity. So
far I jump it from my car and then it can start on its own when warmed up.
I considered pulling the battery when I leave and putting it on a "battery
maintainer" when I get home, but don't really want to lug the battery back
and forth.

Found this solar charger for an RV that is only $30, 1.8watts @ 15V. I
could install a cigarette lighter outlet on the tractor, get a cigarette
lighter extension cord, and put the charger on the roof of the tractor shed.

My question is - Would the battery be discharged by the long periods of no
sun, night time etc.? I guess if the circuitry is good enough quality that
would not happen. Has anyone used one of these unattended for any length of
time?

Is it OK to post a link?

http://www.motorhomesandmore.com/mh_store/findsku.cfm/sku=4231


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