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Old 02-27-2010, 11:06 AM
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Default home made generator generator



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i am converting an old lawn mower in to a generator wanted to no if anyone has tryed this out or any other ideas to help improve this design found plans while looking for other stuff thought i would try it


http://www.theepicenter.com/tow082099.html
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Old 02-27-2010, 11:21 AM
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yes it will work if your engine turns enough RPM'S for the generator your using.
iam working on a water powered generator
Old 02-27-2010, 12:40 PM
ImbriD ImbriD is offline
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We're hoping to build one this year if we can find an old lawn mower. Have a friend that built one using a 3.5 BS engine and it works well for battery charging, 12v appliances or other small appliances.

However, if you're looking to power larger 120v appliances go with a real generator. Realistically the lawn mower / alternator combination is only about 1000 watts with a good sized alternator.
 
Old 02-27-2010, 12:46 PM
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Make a visit to harbor freight tools, they have generators (just the gene without a motor). You can surely find better prices online, but handling the Gene will give you ideas on how you want to build.
If the price of a Gene is too high for your taste, I hear that the motors out of old reel to reel tape decks make excellent Generators.
I know most would consider using car alternators because they are pretty much complete, but you can produce much better and efficient power by going with either route I provided, and probably many more that I have yet to learn.
Old 02-27-2010, 12:58 PM
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Interesting project! Keep us posted.
Old 02-28-2010, 10:02 AM
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http://www.survivalistboards.com/showthread.php?t=24036 you can also try this for the gas engine.
Act
Old 03-02-2010, 04:37 PM
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I used to use a lawnmower powered GM alternator to recharge my 12v system when the solar shortchanged me wuring the winter months.

I used a 20" plywood pully wheel to get enough RPM for the system.

It is not rocket science and it is cheap. Good stuff to know when the chips are down and one can not run down to Harbor Freight.

Sure, it's easier, and sometimes cheaper, to go buy one, but that is not surviving, it is shopping.
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Old 03-02-2010, 05:02 PM
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I've got an 8hp pressure washer with a blown up pump, I just might give this a try
Old 03-04-2010, 07:27 PM
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Quote:
Originally Posted by sesa View Post
I've got an 8hp pressure washer with a blown up pump, I just might give this a try
8HP!! you may want to run 2 or 3 alternators.
Old 03-05-2010, 12:39 PM
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what i want to know how to wire a series of batteries if i can use a bigger mator for two alts maybe even three
Old 03-05-2010, 12:51 PM
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Default Generator and HP

A rule of thumb is about 2 hp per KW for a generator.

Yes - you can make a small simple generator using some small surplus gas engine and generate a small amount of useable power.

Just remember in terms of fuel consumption it will be very expensive electricity.

Might be worth it if you just gotta pump some water from that deep well but for most day to day uses it may not be worth it.
Old 10-04-2010, 12:41 PM
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Quote:
Originally Posted by sesa View Post
I've got an 8hp pressure washer with a blown up pump, I just might give this a try
You could use it to drive an AC induction motor. They work fairly well as simple generators.
Old 10-04-2010, 02:34 PM
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K H A D
3 4 5 12

KW Hp AC DC

These numbers are really close to the relationship between those units
example

Take the value you have and multiply it by the number under the unit you want, then divide by the number under the unit you have

5HP * 3 under KW/4 under HP = 3.75 KW
Old 10-04-2010, 02:47 PM
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Now here is a twist. As I was reading these posts, I thought, " hey, can a gas lawn mower engine be converted to run on LP?" I'm just thinking in a SHTF, if you got a homemade generator sitting and use it, then all the gas is used up but you got that big tank in the back yard or down the street, you get the point. I'm gonna go a look'n, see what i can find.

first find:
http://home.earthlink.net/~lenyr/pplmwr.htm



Second:

So I guess a guy could do it. I gotta try it.

Last edited by cleatis; 10-04-2010 at 02:55 PM.. Reason: more stuff
Old 10-06-2010, 03:16 PM
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Default induction generator

Quote:
Originally Posted by actrisor11 View Post
http://www.survivalistboards.com/showthread.php?t=24036 you can also try this for the gas engine.
Act
a higher h.p. induction motor gives you more watts to use and a 3 phase motor gives you 3 power taps.
Old 10-07-2010, 01:54 AM
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One advantage an alternator has is you can tap the ac current before the bridge rectifier and basically run a three conductor extension cord to your battery bank then rectify it down to DC current. This would allow the generator to be remote from the batteries enough where the noise would be minimal. Car alternators put out 3 phase ac current which is fed through a bridge rectifier to create very clean dc current. Another thing to think about is just picking up 3 or 4 extra batteries and mount them in the bed of your truck (or the trunk of your car) securely and run some cables to them from your trucks battery. You would need to put in a battery cut off switch so you could not drain your truck/car battery. Then every time you drive your car you are storing power...couple those batteries with a 2000 watt power inverter and you can run quite a few things. If you double up on the batteries you can have one set on your house and one set charging all the time. There is a very good article about this in an old issue of the Backwoodsman magazine for July/August 2008 available here:
https://www.backwoodsmanmag.com/archive_issues.html
for about $6.00. Depending on your location and assuming you have a vehicle that you have to drive occasionally this could be a viable alternative. You can get a battery cutoff switch from Harbor Freight for about $5.00 and they also have their power inverters on sale a lot. I have a 1000 watt inverter on my battery box that I charge with a 70watt solar panel I built. In the box I have two large deep cycle rv batteries that I bought from Walmart. I have been able to use that set up to run angle grinders for cutting and grinding steel for my knife making interests and so far I have never been able to run the batteries down. Using a vehicle to charge the batteries would be no different.
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Old 10-11-2010, 07:46 PM
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Quote:
Originally Posted by dmac27 View Post
One advantage an alternator has is you can tap the ac current before the bridge rectifier and basically run a three conductor extension cord to your battery bank then rectify it down to DC current. This would allow the generator to be remote from the batteries enough where the noise would be minimal. Car alternators put out 3 phase ac current which is fed through a bridge rectifier to create very clean dc current. Another thing to think about is just picking up 3 or 4 extra batteries and mount them in the bed of your truck (or the trunk of your car) securely and run some cables to them from your trucks battery. You would need to put in a battery cut off switch so you could not drain your truck/car battery. Then every time you drive your car you are storing power...couple those batteries with a 2000 watt power inverter and you can run quite a few things. If you double up on the batteries you can have one set on your house and one set charging all the time. There is a very good article about this in an old issue of the Backwoodsman magazine for July/August 2008 available here:
https://www.backwoodsmanmag.com/archive_issues.html
for about $6.00. Depending on your location and assuming you have a vehicle that you have to drive occasionally this could be a viable alternative. You can get a battery cutoff switch from Harbor Freight for about $5.00 and they also have their power inverters on sale a lot. I have a 1000 watt inverter on my battery box that I charge with a 70watt solar panel I built. In the box I have two large deep cycle rv batteries that I bought from Walmart. I have been able to use that set up to run angle grinders for cutting and grinding steel for my knife making interests and so far I have never been able to run the batteries down. Using a vehicle to charge the batteries would be no different.
thank you for the info i just purchased a desert property and am building my cabin takeing my unit up there and will use your ideas
Old 10-26-2010, 09:07 AM
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www.theepicenter.com/tow052903.html
small gas engine with alternator charging several deep cycle batteries with a good size inverter will work well for microwaves, etc. that use a lot of electricity for a short time.
Could be used in conjunction with solar and wind power.
Old 10-26-2010, 09:31 AM
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Quote:
Originally Posted by dmac27 View Post
One advantage an alternator has is you can tap the ac current before the bridge rectifier and basically run a three conductor extension cord to your battery bank then rectify it down to DC current. This would allow the generator to be remote from the batteries enough where the noise would be minimal. Car alternators put out 3 phase ac current which is fed through a bridge rectifier to create very clean dc current.
Maybe I'm missing something, but why would you tap off before the rectifier at the alternator then attach to another rectifier at the battery bank?

Why not just use the normal DC output to charge the batteries? You could use the same extension cord and have the remote location you propose.
Old 10-26-2010, 10:38 AM
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Quote:
Originally Posted by Meat Guy View Post
www.theepicenter.com/tow052903.html
small gas engine with alternator charging several deep cycle batteries with a good size inverter will work well for microwaves, etc. that use a lot of electricity for a short time.
Could be used in conjunction with solar and wind power.
I know on the link it says it is a portable washer cart, but I think an old metal framed chaif will work. Thats what I thought it was.
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