Found this while looking at the window latch thread- thought I'd pass it on....small but could maybe be useful. Amazon.com: Suaoki Portable Generator Gas-free Quietly Solar or DC 12V...
Jim
Tried to make a link but messed up.
Here's your link:
Amazon.com: Suaoki Portable Generator Gas-free Quietly Solar or DC 12V... (http://www.amazon.com/Portable-Generator-Gas-free-Operated-Inverter/dp/B018GE8JPY)
I think it is a misnomer to call this device a "generator". It does not generate anything - it is a battery + a inverter. Useful...possibly...kinda pricey.