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 Load testing a Generator
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Lykenth
New Member


United Kingdom
45 Posts

Posted - February 11 2012 :  15:02:26  Show Profile  Visit Lykenth's Homepage Send Lykenth a Private Message  Reply with Quote
Hello, its my first post =D

Iv been working on my generator for a while now, but i come to realise - an this sadly goes for others i did in the past - iv never really done a good load test. i dont have scopes and gadgets as such, so the way i did it was sticking thing ( motor, led, light, resistors ect) onto the bridge rectifier, to the AC or short circuiting it an going... so it does that. No really thats what i do an its *Not So Smart*!

Is there something i could make or do to get a better base understanding about my out puts thats simple.

My thinking is this; Stick a 10ohm resistor onto the AC or DC if it gets warm its producing X amount of power to make it warm, measure the volts and guestimate the amps.
An if it dont get warm - observe how much the generator slows ( if it does ), an if it slow with only a 10 ohm resistor - the generators a fail - bin it an move on.

any help would be appreciated,

Lykenth

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49er
Administrator



USA
4426 Posts

Posted - February 11 2012 :  15:15:00  Show Profile Send 49er a Private Message  Reply with Quote
Hi Lykenth

Welcome to IAEC and thank you for the Info about the testing of the generator. Looking forward to more of what you would like to know and share.

Doug
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Your only as DUMB as where your standing.
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TinMan
Advanced Member



4082 Posts

Posted - February 11 2012 :  20:54:13  Show Profile Send TinMan a Private Message  Reply with Quote
Hi Lykenth-and welcome to IAEC.I have drawn up a simple but efective and acurate load test for calculating watt output of a generator for you to try.Hope this helps


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iaec
Forum Admin



1033 Posts

Posted - February 11 2012 :  21:04:41  Show Profile Send iaec a Private Message  Reply with Quote
Hi there, welcome on board...:))
Nice to see that you made an account here...^^

About how to measure your output, what i`ve read/seen is that resistor and cap thing wich i personally never done.lol
What i use is just an load like you did with that electro motor and put a analog/multi meter in series with it on the positive.
And another meter for the voltage at the load itself...than you have volts and amps = watts.
This is how i do it so i dont know if theres an better way.lol
But since you have an gen that doesnt slow down when loaded why not do this...
Short it thru a low ohm primary of a transformer and than use the secondary thru a FWBR to a load.
But if your gen doesnt make much milli amps to begin with you should try to get a small transformer :)

Or use Poppy`s Voltage Doubler wich is more like a Voltage Tripler on your AC output and take it from there...

Hope this makes some sence and help you out abit...^^

TimberJack

***Possibilities Within The Impossible***

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iaec
Forum Admin



1033 Posts

Posted - February 11 2012 :  21:05:21  Show Profile Send iaec a Private Message  Reply with Quote
LOL TM, always posting at the same time as i do on saterdays.lol
And thanks for that circuit, i do need to try it out :)

TimberJack

***Possibilities Within The Impossible***

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TinMan
Advanced Member



4082 Posts

Posted - February 11 2012 :  21:10:00  Show Profile Send TinMan a Private Message  Reply with Quote
Lol-situation normal-oh and it's sunday here lol.

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msmjr
Average Member



USA
444 Posts

Posted - February 11 2012 :  21:10:35  Show Profile Send msmjr a Private Message  Reply with Quote
Hey Lykenth and Welcome
I agree 10ohms is not much of a load. I had just a volt meter when I started about a year ago now a couple more volt meters (harbor freight cheap)and 2 amp meters I have a better idea where Im at. Still no scope! but Im slow LOL :( Im sure 1 of the other guys may be able to give you some better ideas but I might try a battery, measure voltage gain over time.

Growing old is mandatory, Growing up optional.
He is wise who gains wisdom from another's mishaps.
—Plutius Syrus
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msmjr
Average Member



USA
444 Posts

Posted - February 11 2012 :  21:13:22  Show Profile Send msmjr a Private Message  Reply with Quote
Hey TJ looks like TM got the jump on both of us LOL

Growing old is mandatory, Growing up optional.
He is wise who gains wisdom from another's mishaps.
—Plutius Syrus
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Lykenth
New Member



United Kingdom
45 Posts

Posted - February 12 2012 :  10:16:45  Show Profile  Visit Lykenth's Homepage Send Lykenth a Private Message  Reply with Quote
quote:
Originally posted by TinMan

Hi Lykenth-and welcome to IAEC.I have drawn up a simple but efective and acurate load test for calculating watt output of a generator for you to try.Hope this helps






TM, thanks for this it will be perfect =]
There is one thing id like to know - That "Globe" light, I have a 20W globe light in my junk box ( my room lol ) will that be ok to use?

Lykenth
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TinMan
Advanced Member



4082 Posts

Posted - February 12 2012 :  16:58:51  Show Profile Send TinMan a Private Message  Reply with Quote
Hi Lykenth-the size of the globe will depend on the size of your generator.Give it a try,the worst thing that could happen is it will blow.If your generator is big try a headlamp out of a car.

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