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That would do the trick. You can get cheap solar panel and regulator packages on ebay if you want the lot. That reg would handle a 60-80w panel.
I run a solar setup to charge the camper trailer battery whilst away.
Solid panels are around $1/watt up to $2/watt with a MPPT controller but you only need a pwm one for what your doing and that would be about $1.50/watt tops delivered.
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