electr0n wrote:That is cool. I've been thinking about doing something similar. So you've got 75v at 1.14 amps there? 85 watts for $200 nice. Our power just went out two days ago. It doesn't happen very often but it'd be nice to have some alternative backup like solar panels. I had my nearly 1 kilowatt hour worth of batteries sitting here fully charged wishing I had an inverter to run.
I'd really like to try building a mini wood gasifier to run a small generator. That would be much cheaper than solar panels and not limited by the lack of sun.
I was thinking of building a generator exersize bike for th old a123 cells I have from my last pack
It's 12v now, runs a good 2000W inverter, for power outage bike charge emergency.
Solar is good
Get an inverter my friend! True sine is the best.
I did some experimenting with how much human power it would take to charge my bike, using regen. I loaded up a 150lb trailer hooked to the bike. Pushed it up a hill and regen down. With about 5 minutes of work, pushing this load up some small hills, I gained about 4 watt hours back into my battery (according to my CA).
That's the last time I'll do that. I think it's about 4x less efficient to pedal charge an ebike, than to pedal a normal bicycle to go the equivalent distance. Mostly because the conversion of energy back into the battery on the bike is so inefficient. But also due to the losses in friction of 4 tires on the road. That's not to say ebikes are bad at all. I just don't think we should put human energy into charging them. Clearly, solar is much better at charging my bike, assuming you have good sun. In an emergency, a bike generator to power your laptop would be perfectly fine.
Today was the first time I had to unplug my solar panel. I took a trip to a friends place, which used 66wh, and after about 90 minutes I had to unplug because I was at the point of charge voltage that I don't want to pass. I tell ya, compared to 25w of panel, 75w really gets the job done a LOT faster. (3x, duh)
I actually do have a 400w/800w sine wave inverter from Harbor Freight. I powered my drill with it off 4 headways. If I went this route to charge, think about the inefficiency of going through an inverter AND a charger! Easily lose half the energy right there. My charger is 70% efficient.