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Author Topic: Simple 2.5kw power station for boats or home, with solar charger  (Read 16364 times)

Offline Tommey Reed

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This is a design using a dc motor for making up to 2.5 kw of power, at 36v/70amps.

http://www.youtube.com/user/OverUnityNow1#play/uploads/16/WskItfkpS4g

Tom

Free Energy | searching for free energy and discussing free energy


Offline DreamThinkBuild

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #1 on: August 07, 2009, 03:54:52 AM »
Hi Tommey Reed,

I've been following your work with great interest. I've been working on a small DC turbo generator. Before I begin it is not over unity in any way, just a way to convert DC to AC without using a inverter and the output is a pure sine wave. I'd like to convert it over to AA batteries and solar charge them during the day. A Earth battery would be even better.

My current setup is a high speed DC motor, 5000rpm (reduced when running a load due to Lenz drag), running off a standard 9v battery. Connected directly to the shaft is a diametric cylinder magnet. Three fish pump coils are used for the pickup and are wired in series.

The input 9v 130ma (with magnet load) which is about 1.17watts input.

The output is 208vpp ac which breaks down to
Vp=208vpp/2= 104vp.
Vrms=104vp*0.707= 73.528 (meter shot is pretty close)
Vavg= 66.248

It draws 6.2ma through a 10ohm load = 384uw

The first shot shows the meter connected to it. I used legos for the support structure they allow for fast prototyping, trying different coil configurations and tweaking distances. You can see the three black cords from the fish pump coils.

The second shows a little closer view of the generator. You can make out the diametric magnet in the middle. Can't tell from shot but it's spinning pretty quick.

The third and forth shot shows it running a 1.5watt 115vAC LED accent light from 9v DC. If I pump 12volt in I can get it much brighter and peaking a 361vpp.

If you or anyone else has suggestions on how to make a better low power DC turbo generator I'm all ears.

Dave45

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #2 on: August 07, 2009, 12:58:23 PM »
I like the lego's idea cool

Free Energy | searching for free energy and discussing free energy

Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #2 on: August 07, 2009, 12:58:23 PM »
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Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #3 on: August 07, 2009, 02:37:25 PM »
I like your setup, simple and to the point.
As we all know, energy is what we need to power the homes we live in. Sometime simple is the best way to under energy, most people don't understand what energy is.
Energy is work, just like lifting 10 lb at a height of 10ft is work.
745.7 watts is 1 hp or, 746 watts have to be understand to make energy.
1 hp equals 1 pound taken to a height of 33,000 feet in one minute, is also 1hp.
When we talk about foot pounds, we have to understand it's 12" away from the shaft.
In other words, 24" wheel on a shaft will produce 1 foot pounds on the outer circumference and 12" pounds on the shaft. each revolution of the shaft produce (24" x pi)/12=6.28 ft of work.
33,000/ 6.28= 5254,but we use 5252.
This is how we can calculate hp. (torque x rpm)/5252
This formula is the key to make energy or to power a dc/ac motor.
3600 rpm/60= 60hz on a basic generator, we can find how much torque is needed to produce say 1 hp.
If we take 5252/3600 rpm we get a constant torque of 1.46 foot pounds.
Also we can get the same 1hp with 600rpm at (5252/600)=8.75 ft/lb constant torque.

I know you all know this by now, this is just a reminder of how energy is made.
There is no free lunch in a 746 watts of power....

Tom

Free Energy | searching for free energy and discussing free energy


Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #4 on: August 07, 2009, 02:45:07 PM »
Is your design rotating a magnet?
My 2.5kw is doing the same, just in a much bigger size.
To get the true sine wave, we use a constant rotating field to make ac sine wave.
Is that your design?

Tom.

Free Energy | searching for free energy and discussing free energy

Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #4 on: August 07, 2009, 02:45:07 PM »
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Offline markdansie

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #5 on: August 07, 2009, 02:57:24 PM »
I have one dumb question.
What advantages does your system have over using a solid state inverter?
I am not trying to be synical
kind Regards
Mark

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #6 on: August 07, 2009, 03:30:17 PM »
Most inverter runs of 12v dc, so we can start there.



If I pull 1000 watts from my 36v dc generator I know that (1000/36)=27.8 amps with 3 batteries in series

If you do the same at 12v inverter you will pull (1000/12)=83.3 amps in 3 batteries in parallel.

It sound the same, but they are different.

As we all know inverter have a problem, its heat. The higher the temperature the less efficiency in electronics.
Also battery amps is the cause of short life too, by pulling less amps out of batteries you get greater efficiency and life out of it.
This is another reason why EV go with higher voltage.

Tom

Free Energy | searching for free energy and discussing free energy

Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #6 on: August 07, 2009, 03:30:17 PM »
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Offline DreamThinkBuild

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #7 on: August 07, 2009, 05:12:06 PM »
Hi Tommey,

My design uses a diametric magnet. The magnet is attached directly to the shaft of the DC motor. I attached a closer shot of the motor and magnet. 3 coils pickup the AC.

I also attached a picture of it's bigger brother. This is using an electric snow blower motor belt driving the alternator (Has high speed and torque). Couldn't find RPM rating on motor(Toro s-210) but says shovels 200lbs a minute of snow. The Kill-o-watt meter shows it drawing 110vac 632watts 6.42amps. Now the Wind Blue is hooked through a bridge for DC output.

http://www.windbluepower.com/Permanent_Magnet_Alternator_Wind_Blue_Low_Wind_p/dc-540.htm

It shows an output of 248vdc @ 15amps = 3.7kw

Hello Marksdansie,

It is a good question, you can spend $800 or more on a pure sine inverter. Also most inverters have a no load/idle power draw(loss) of about 1amp. Running through the coils you get a pure sine wave out with only the cost of the coils ($40). If I fry the inverter I'm out $800+ fry a coil I can pop in a new one for less than $10. DC motors are also quite in-expensive.

The challenge is try to create a small portable turbo generator that can run off batteries or solar directly. Someone suggested I look at RC car motors they go up 35,000 rpm. I was originally using a Dremel tool @ 20,000 rpm but the motor is not built to run very long.

Now the pictures.
Pic's 1 and 2 show the closeup of the motor and magnet. You can also see one of the removed fish pump coil in the first shot.

Pic 3 shows the snow blower motor and wind blue setup. Small wire shelving also makes for fast prototyping and it's portable too.

Pic 4 shows it running showing the snowblower motor drawing 578watts and the wind blue putting out 248vdc.

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #8 on: August 07, 2009, 05:48:07 PM »
When we talk about power, are you pulling any load when testing voltage and amps? Your set up show only volts, or is there something I missing?

120v ac brush type blower motor will run on dc 120v, I understand the higher rpm,s at no load.

But when a load is added, it will slow down the motor too.

your alternator have no regulator in it, or does it?
So at 13.5v @ 70a = 945 watts or 1.27 hp at what rpm's does this make that current?

a 13.5 @150a could product  2025 watts, but you will need 2.7 hp of motor power.
My generator has a 3.5 hp dc motor to run 2.5 kw generator.
The basic pull at no load to get to the 3600 rpm is (36v x 8A)=288watts.
That is my lost to get enough rpm's to start generating electricity at 60hz
In other words, as soon as I add 60w pull my amps increase by about 1 amp.

I have worked on high speed motors, but they have much lower torque to convert into energy...They also new more energy to produce higher rpm's.

My thought are 746 watts, will take one horse power of ac or dc motor power to make.
Just my understanding in energy....

Tom...

Free Energy | searching for free energy and discussing free energy

Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #8 on: August 07, 2009, 05:48:07 PM »
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Offline DreamThinkBuild

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #9 on: August 07, 2009, 06:58:10 PM »
Hi Tommey,

You are right, the alternator is running unloaded so that is the higher reading. The alternator has no regulator, it puts out three phase AC which is rectified through the external bridge. I'll unhook the bridge and put an AC load on to give you a better reading with a measurable load. Thanks again for your experience, time and interest.

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #10 on: August 07, 2009, 07:23:37 PM »
I hope I can help you not to make a mistake I did in the past with the pulse generator on OverUnity, they will eat you alive.
Try to test input voltage @ amps and the output voltage @ amps.
This will give you all the data needed to make it more efficient.



Tom...

Free Energy | searching for free energy and discussing free energy

Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #10 on: August 07, 2009, 07:23:37 PM »
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Offline DreamThinkBuild

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #11 on: August 08, 2009, 12:45:59 AM »
Hi Tommey,

 :o The final result is it's too in-efficient with this motor setup, the numbers show it clearly.

Results with a 75 watt light bulb run through 2 phase output.
Kill-o-watt measures the input(snow blower motor) loaded 7.67 amp 110vac 720 watt (wow! that is backwards)
Alternator Output measures 146vac 710ma

Results with a 400 watt Quartz Heater. ( ;D 838watts to get a 400 watt heater running)
Input 838 watt 8.53amp 110vac
Output 66vac 1.70 amp

I tried pushing it with a 800 watt heater but the belt started slipping. Too much load and loss with the system.

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #12 on: August 08, 2009, 01:26:26 AM »
Now you see the devil in the details, very in-efficient. You now see the truth in front of you, no free lunch.

You would be better to have a bigger motor, maybe a 2hp will do to make 1000watts of power.

Sorry that your design did not work the way you wanted it too, I've been there many times.....

Tom....

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #13 on: August 08, 2009, 01:41:24 AM »
Think of energy, 746 watts of power. This can be more efficient if you calculate the max rpm's and bring it down to 3800-3600 rpms.
In other words, if your motor is running say 10,000 rpm's you can add more torque when you gear in down to 3800-3600 rpm's.

If your not shore how to calculate gearing take 10,000/3600=2.7 or say 3:1 gear ratio.
This will increase efficiency on your unit...

My dc motor runs at 3800 rpm's, with no load.....

Hope this helps..
Tom

Offline Tommey Reed

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Re: Simple 2.5kw power station for boats or home, with solar charger
« Reply #14 on: August 08, 2009, 01:48:25 AM »
I see that you are using pulleys, all you would need to do then is calculate the circumference of your motor pulley. (d x Pi) and times the ratio. or say 1:3 would be motor pulley and gen- pulley  (d x pi)  and (d x pi)  x 3.

Tom

 

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