In the trials I used a 1 kw gin long mpg, great device does exactly as the graft showed . I've being running this for almost 3 years now and get on average 18 to 20 kw a day.
Trial 2,  I used a 24 volt variable magnet alternator.I know pmg is a religion but I wanted to charge a battery bank without the need of load controllers and dump loads. Not as efficent as the pmg but cutting out the cost of the extra parts, not to bad between 500 to 600 w an hour and this use able power on like pmg