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Old 06-03-2003, 05:46 PM   #16
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thats exactly what it is, but thats not what im looking for. im looking for something that will power my charger, such as an alternative to a car battery which has "clean" power that has no electrical noise that interferes with the chargers capablities.
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Old 06-04-2003, 01:09 AM   #17
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i just bought a power supply recently and it is 15v 13 amps and i can run two charges and a fan off it and it is working fine i got mine at dicksmith for $153.00 au
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Old 06-04-2003, 05:50 AM   #18
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i think there is a bit of conufsion here.

in order for a power supply to work you need AC! its not a portable power source. so unless your track has an ac outlet, then your stuffed and limited to your car battery.

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Old 06-04-2003, 06:08 AM   #19
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If you have no AC power available, and you want the cleanest power possible, get a DC to AC converter. Then get a DC power supply, and hook that to the inverter. That will give you clean power. You should be able to get an inverter at a car parts store (NAPA, etc)

Do this only if you are racing outside, and have no AC power available. If you have AC available, just get a DC power supply.
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Old 06-04-2003, 06:29 AM   #20
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I dont see what you are talking about with the electrical noise. Most powersupplies these days you wouldnt even consider that as its not an issue.

A switching powersupply, aka, switchmode power supply, is about the best way to convert ac to dcand take it down to 12v. It uses transistors etc to take the voltage down as opposed to a large coil, thus reducing size (and i mean alot, amp for amp) and weight.

If you want absolutly no ripples in the supply bung a few extra capacitors in it! I run two on the 12v side (put them in myself, doestn realy need them but they are there) or if you know someone electronicaly inclined put a few more in after the bridge rectifier.

Its all good. I run a converted computer power supply no probs and i charge 7 cell packs with no probs with my CDC.
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Old 06-04-2003, 10:37 AM   #21
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I have a few questions about using a car battery to power my charger:

1. Can I use my charger off a car battery while the engine is running??

2. Can I hook more than one charger onto a car battery??

Thanks for all the help
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Old 06-04-2003, 01:16 PM   #22
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answers to your questions:

1. yes you can charge while the engine is running, instead of having 12v from the battery you'll get about 14v from the battery and alternator.

2. yes you can hook more than one charger up to a car battery but your charge rate will be limited.

if you have a 10A supply, you could have two chargers at 5A each, but if you had them at 6A each, they would error as the power suppply is not good enough.

(I haven't corrected for the drop in voltage in the above) but the theory is correct.

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Old 06-04-2003, 01:23 PM   #23
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1) Yes you can, and you will get a better charge, becuase the voltage from the battery is higher, around 14-15, instead of just 12.

Make sure your charger is disconnected when you go to start the car, though. If you start the car with the charger plugged in, you will blow up your charger. When you start your car, the battery voltage drops, and so your charger would draw a lot more current. Then the car starts, and the voltage goes back up, and your charger blows up.

2) Yes, you can use as many chargers as you want. Your only limit is the capacity of the car battery, and the alternator, ie if you are pulling WAY too many amps, youll overload the car, and there will be no juice left in the car battery.
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Old 06-04-2003, 01:45 PM   #24
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does anyone here know if the Pyramid power supply that i mention above is a good buy or not? any other power supply that is cheaper?
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Old 06-08-2003, 09:42 PM   #25
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I think he wants a generator. Something to make power.
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Old 06-09-2003, 04:45 AM   #26
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try briggs and stratton or honda, they make a great range of portable power equipment generators

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Old 06-09-2003, 10:02 AM   #27
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Hi Guys, Just wanted to point something out.

YOU SHOULD NEVER CONNECT A CHARGER to an automotive battery while the car is running. The alternator will run at above 18 volts witch WILL damage most chargers. The Alternator kickin on and off also make for unstable voltage. NEVER- EVER connect a charger while the automobile is running.

You can use just about any power supply that meets the charge current of your charger. If you only charge at 5 amps, you can use a 5 amp power supply. You need "Maybe" .5 amp extra for fans in the chargers. But most supplies will handle that. Power Supples are converters, they need to be plugged into a wall socket to work.

If you don't have a wall socket to work from, the automobile battery would be better than most other options. A generator is a fairly expensive option for a parking lot racing situation.
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