Build a Solar Power Generator for Under $300

One of these “will run radios, fans, and small wattage lights all night, or give you about 5 hours of continuous use at 115 volt AC, or about an hour boiling water.” That’s great, but I’m more interested in this design’s ability to scale-up with the addition of larger components; I’m guessing the price grows exponentially as you increase capacity.

(Originally posted to rain.org.)