Hmm. Those BP are polycrystalline type solar cells. More power, but
more expensive. I chose to go with the amorphous variety I got a couple
of BatterySaver SE 18 watt panels (available at Camping World for $180
each to members). They already come with an controller to prevent
overcharging of the battery, plus all sorts of connectors to either
plug into a cigarette lighter (charging a battery that way), or provide
a cigarette lighter socket (so that you can power things directly from
the panels). They can daisy chain off of each other to provide higher
amperage. Have extension cords so I can place them on the roof or
wherever. One can snuggle inside the luggage rack and be totally
invisible to anyone walking past.

So I only end up with about 36 watts (max) of charging capacity. That's
enough to keep the battery charged, as I don't use all that much
electricity when camping. My laptop can run 3-4 hours on its own
batteries, and if I use my laptop more than that when camping, I need
to have my head examined....

Kim Brennan
86 Syncro. 91 Westy Syncro. 90 Tristar
Vienna VA. Sugar Grove WV.