I just want to let you know that you explain things very well and your craftsmanship isexcellent. I was given about 50 lbs of powdered iron and I have been considering pouringmy own large toroid core for a generator so when I seen your video I was blown away. I think a toroid generator in conjunction with a MPPT controller could be a real ticket for a useful device. Once again, thank you for explaining this in detail