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What's a good power source 4 bench tests?
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MadScientist Offline
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What's a good power source 4 bench tests?
When building different cell designs and bench testing them, what are you guys finding is a good cheap power source? A car battery, car battery charger, or is there something else out there that you can easily adjust the voltage and amperage on for testing?
Thanks so much everyone.
10-24-2008 03:11 PM
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cmac0351 Offline
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RE: What's a good power source 4 bench tests?
I use an old computer power supply with the 12v wires grouped together, but that has limits. The amperage rating is on the sticker on the unit so you can see what it is at 12 volts, but I am trying to find a way to step the volts up to 13.5 or 14 to match the car better.

MadScientist Wrote:When building different cell designs and bench testing them, what are you guys finding is a good cheap power source? A car battery, car battery charger, or is there something else out there that you can easily adjust the voltage and amperage on for testing?
Thanks so much everyone.
10-24-2008 05:32 PM
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Gary Offline
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RE: What's a good power source 4 bench tests?
Power supplies, chargers and the like pulsate and will give different results than an alternator. Your best bench test would be an electric motor and an alternator, set to a relative rpm.
I even get different results when using the truck battery hooked up with a charger. Nothing I know of will act like your alternator.
(This post was last modified: 10-24-2008 06:25 PM by Gary.)
10-24-2008 06:24 PM
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MadScientist Offline
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RE: What's a good power source 4 bench tests?
Thanks everyone. I know that once the battery starts the car, the alternator takes over so that is what we need to imitate. Maybe I'll just go to a junk yard and get an old alternator, and then hit a surplus store and try to find an electric motor. Thanks Gary.
10-24-2008 10:40 PM
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Gary Offline
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RE: What's a good power source 4 bench tests?
Exactly what I'm doing.
10-25-2008 06:09 AM
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cmac0351 Offline
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RE: What's a good power source 4 bench tests?
Gary, do you have a picture of that setup, or maybe a youtube video even. That would be something worth looking at.

Gary Wrote:Exactly what I'm doing.
10-25-2008 06:46 AM
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Gary Offline
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RE: What's a good power source 4 bench tests?
Heheh. No, you said "Maybe I'll just go to a junk yard and get an old alternator," and I meant THAT was where I was at. I have electric motors, but not an alternator. Here's a thot: doesn't have to be a big one, since you're only running under 75 amps.
10-25-2008 05:44 PM
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felix the cat Offline
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RE: What's a good power source 4 bench tests?
Gary Wrote:Heheh. No, you said "Maybe I'll just go to a junk yard and get an old alternator," and I meant THAT was where I was at. I have electric motors, but not an alternator. Here's a thot: doesn't have to be a big one, since you're only running under 75 amps.

I Have an old altenaror ,with a 3/4 hp - 3450 rpm.
Couldn't get it to excite,so used a step pully to get more rpm.
Now when i excite it , it starts,but get O.L instantly.

Going to try a 1 1/2 hp with same pully.
10-25-2008 10:24 PM
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Gary Offline
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RE: What's a good power source 4 bench tests?
If you don't have a remote tach to check the rpm with, you can do it with math and your pulleys. If that boggles you too much, hack a small cut in your alt. pulley on your car and one on your external alt. With the motor running, drag a wooden stick on the pulley and listen to the clicks. If your external one sounds the same, they're running the same rpm.

....ain't nothin' like country...
10-26-2008 04:39 AM
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realtyroy Offline
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RE: What's a good power source 4 bench tests?
If you run a alternator with out a battery you could let all the magic smoke out of the alternator Smile The diode bridge will not like not having a battery hooked up and could burn out because of it.

Just my 2 cents.

Roy

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10-26-2008 07:44 AM
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