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Author Topic: Help me find the power  (Read 6491 times)

CptCafne

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Help me find the power
« on: August 12, 2008, 09:53:00 AM »

Ok, here is my stupid question for the week  :P.  I have a device that requires 6 VDC @ 2000ma.  I have a brick that out puts 15 VDC @ 1A.  I also have a converter used to wire said device direct in a vehicle (12-24 VDC to 6 VDC @ 2000ma).  I am assuming if I plug the 15 VDC brick directly into said device, I will smoke it.  So is it safe to wire the 12-24 VDC to the 15 volt brick ?  Will that give me enough juice to run this device ?
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MaxamusCrasious

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Re: Help me find the power
« Reply #1 on: August 12, 2008, 10:10:45 AM »

Well, it all depends on amperage. I don't remember the math to calculate required input amperage (i.e. it would take twice as many amps at an input voltage of 12v as opposed to 24v) But you could give it a try just make sure you can unplug it quickly just in case :D

But as an example if the converter required 1.5a at 12v to give you the 6v conversion it would only require 750ma at 24v

So if you find the amperage difference (1500ma - 750ma = 750ma) and divide it by the voltage difference (24v - 12v = 12v) then divide the amperage difference by the voltage difference ( 750ma / 12v = 62.50ma)

Next to calculate the amperage based on a given voltage multiply the amperage interval by the difference of the given voltage and lowest voltage ( (15v - 12v)*62.50) = 187.5ma ) and then subtract the amperage we just got from the amperage at 12v (1500ma - 187.50ma = 1312.50ma )

So when the converter is given a 15v input it would require approx 1.3a. Now if said 6v device is not running at a full 2a it SHOULD be fine.

CptCafne

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Re: Help me find the power
« Reply #2 on: August 12, 2008, 10:29:25 AM »

well, I either fried the device, or 15VDC @ 1a isn't enough for it.  power light didn't come on.  And yes, I checked polarity first.  Question, since this was originally designed to be used in a vehilce, what is the amperage off a car battery anyway ?  This goes along with MaxamusCrasious posting about amperage.
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MaxamusCrasious

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Re: Help me find the power
« Reply #3 on: August 12, 2008, 12:55:42 PM »

Well, that depends on both the battery and alternator in your car. When the car is off it depends on the charge and size of the battery in the car. When the car is on the power is fed from your alternator which is at least 60amps, but your cigarette lighter is usually on a 10 or 15amp fuse, generally you will have 6 amps or so to work with regardless of if the car is on or off.

CptCafne

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Re: Help me find the power
« Reply #4 on: August 12, 2008, 03:15:49 PM »

I decided it was to much hassle and made my boss order a wall adapter for it.
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