Build a 12 volt generator from an old push mower.

[Jags]

Was thinking of all the folks that have been discussing generators and power inverters and whatnot for backup power for everything from stove/insert fans to keeping their pellet stove in action during a power outage. It brought back a project I had seen many years ago.

(broken link removed to http://www.theepicenter.com/tow082099.html)

This project is probably suitable for a DIY/ Fiddly type person that is looking for a relatively low power generator. Something of this style coupled with a single battery and properly sized inverter could probably get by for a long time on a small amount of fuel. Or they could go and buy a generator and be done with it.

Anyhow - thought this might interest a few folks that might be looking for a cheap method to run small electrical loads.

ETA - the linked site above does have items for sale for this purpose, but I don't see the need for any specialized items. The engine, pulleys, alternator, etc. can all be sourced or made from various outlets and or stock material. Heck - a base could be made from a 1/2" piece of plywood and strategic bracing (for example).

 

[ironpony]

my BIL did this many years ago and it does work. Back then we both fiddled with cars and had all the parts sitting around which meant free. Yes you can get by with a small generator and planning to run critical needs. I use a 5kw and do just fine.

 

[SXIPro]

I sometimes think homeowners that size their generators use the same principle as when they buy a lawn tractor. "My buddy has a 10HP mower, so I'd better get a 15HP". I have a 5KW generator and it'll run my pellet stove, fridge, freezer, downstairs lights and my shallow well pump.It'd probably run the TV too, but typically if the power is out, so is cable.

 

[mustash29]

One of the best bang for your buck alternators is a GM AD-244. These were stock on most early 2000 era full size trucks, tahoes, etc that had the HD electrical option. They put out 100 amps at idle, 145 amps at rpm. They can be found in just about any junkyard for cheap, or from Auto Zone with lifetime warranty.

 

[Warm_in_NH]

The guy squatting in the woods up the road from me had a set up with a lawnmower, alternator, battery, Etc... Worked well enough for his "shake n bake" metho lab.

DEA and locals found it in the raid. My buddy was there, said everyone was quite impressed by it. Ha. Best part was when they set up for the "raid" the guy had a great hound dog, and the cops all had laser sights, I heard the dog was having a field day chasing all the red dots around right before they kicked in the trailer door.

 

[FanMan]

Another take I've seen on the lawnmower generator is to use a heavy duty truck alternator and a couple of heavy duty batteries, and you have a portable arc welder.

Dana

 

[xman23]

Jags thanks. That's a nicely documented project for someone that wants to build themselves a small generator. I carry various size 110 VAC inverters in a my cars and motorcycle. Great for charging phones and computer when we don't have a 12VDC charger.

 

[Dr.Faustus]

I saw that page! I had wanted to do that for about 3 years, and almost went to get the supplies but then was given a 7,500 watt diesel genset from my brother who upgraded to those propane standby units.

It looks like it would work well, and i was going to opt for their bracket and pulley since it seems like it would greatly simplify the whole thing.
I still might have a go at it, if im ever that bored and have a bunch of time off from work to tinker.