Compressed Air Generator
While you can do lots of actual work with compressed air, you can also use it to generate electricity, which can be stored in a battery, or used directly.
Designed to work in tandem with a Trompe.
This would be less efficient than just using it to do work, but would allow you to use electric tools on days that are cloudy, or overnight if your battery is dead.
First saw with permaculture.
link to videos online
Link to video air powered engine, can create electricity.
Keywords: Electricity | Generation | Generator | Trompe | Compressed air | Generator