It's called the Sunforce 50032 15 Watt Solar Battery Charger and it is the best car battery charger and the best marine battery charger amongst all the 12 volt solar battery chargers.
Whilst the Sunforce 5 Watt is a great portable solar power charger, the Sunforce 15 Watt is ideal for use as either a fixed or a portable solar charger.
It has pre-drilled mounting holes, so you can mount it either on a vehicle, boat or building, or you can make up a PVC or aluminium stand and mount it on that. The stand-mounted unit can then either be pole-mounted for use in an outdoor application or carried with you on camping or fishing trips.
Amazingly, these panels can withstand 1 inch hailstones hitting them at up to 50 mph.
That's tough!
This interesting video explains how solar panels work.
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