I am in the process of building a bigger version of this ( https://www.youtube.com/watch?v=CWeu8aI2ofw )with the goal of achieving this ( http://www.someawe.org/someawe-challenges ).
Right now I am load testing my generator. This is my set up.
On the left you see the base station with a 250W direct drive generator hidden behind the disc. On the right you see my load simulator. It consists of an ebike drive and some scrap wood. Both come with built in sensors for power in/output.
For details & updates see http://www.someawe.org/blog