Originally posted by Ray Cox That campstove looks very interesting in its own right. Especially for me who live at a latitude where solar power is almost absent for half the year.
But I'm not sure you can charge D-Li90 on it. From the specs it seems the only output voltage is standard USB 5.5 volts. Our batteries run at 7.2 volts, so you will at least need a transformer between the stove and the battery.
I have never seen any transformer like that, but id' really love to have one.
In my experience, the most convenient off-grid power sources provide 12V. If a DC charger for D-Li90 exists, it will most likely fit a 12V socket. If you can't find a DC charger, you can buy a small inverter going from 12V DC to 230V AC, and use your regular charger. There are inverters available the size of a beer can.
The power source itself is more of a challenge. As was said, the solar panel you need is the size of a windscreen. But I know there are alternatives made from multiple small panels mounted on canvas. Then at least you can wrap it up and transport it. But it's still a lot of hassle.
The cost of a solar panel solution will cost you a lot more than a couple of extra batteries. :-)