My neighbor was throwing out a perfectly good push mower today, so I nabbed it up and I'm going to try to build one of these lawnmower engine powered generators. I did some reading on this
site and it says 3-5hp should be enough, theres no sticker on this motor but it's a good size Briggs & Stratton and it runs great. Also I found when I removed the engine there's already a pulley on the shaft, that should save me a lot of work.
I went to the junk yard and found an alternator off an 85 Pontiac for $20, it appears to be a single wire style alternator which from the website is the easiest one to use. I did a google search and it looks like this alternator is either 56 amps or 78. I'm figuring at even 56amps @ 14 volts that will put out 784 watts which is a good match for my 750 watt inverter.
The alternator has a v style pulley and belt that match the pulley on the lawnmower almost perfect. All I gotta do now it build the base and mounting plate.
One thing I've read with the single wire style alternators is it may put too much strain on the motor when I'm trying to pull start it. I'm thinking to remedy this I could make a quick connector for the battery to the alternator like this
. Then I could start the lawnmower/alternator contraption and then connect it to the battery. Does that sound doable to you guys?
Are there any holes in my plans here that you guys see? Any input/ideas are apprecieatd.