Powerfilm is cheaper than comparable Brunton. At the time this was the best value I could find. In this model the batteries act as a regulator/buffer.
I'm going to get a more powerful panel next year hoping in can charge my netbook.
BTW, the batteries act as a buffer and regulator in this model. The panel charges the batteries and the USB gadget is charged from the batteries.
Last edited by AdamDZ; 11-19-10 at 08:22 AM.