| corryn00 |
Hi, my panel is rated at 12Vdc and 1.5 amps.
I have an old 200 watt computer power supply which states 12Vdc at max 7 amps.
My question is, will this work to power my panel?
I tested the computer power supply and it measures 15.7 Vdc output....???? it says 12Vdc but puts out 15.7Vdc.... will this fry the lcd panel??
Thanks for any help,
Gordon:hot: |
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| bfourcade |
Hi !
The more amps the power suply can suply the better, it means you can connect more "components" to it and it will perform well.
But the volts at the output of the power suply must match exactly the volts "expected" (input nominal tension) by the component you are connecting to the power suply. If you connect the component to a power suply giving more volts it could generates a high current on the component and power suply that may damage the component and some times the power suply itself)
Some components could work with a little higher voltage due they have voltage controllers in the circuit that lies with the diference or variations in the input voltage protecting the whole component.
In your case, I dont know if your panel could manage this 3.5 extra volts at the input. If it cant, you may want to use a resistor to down the volts on the PS output or get another PS with more "close" to 12 volts rate at the output. |
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| corryn00 |
But is a true wall adapter rated at 12Vdc actually 12 volts?
Anyone with one of these please measure it with a voltmeter and let me know!
:confused: |
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| doughboy |
| Something is not right, that computer power supply is outputing 30% more than is should be. A decent wall adapter will output 12V within 5% or so. |
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| ace3000_1 |
Try testing it under load, all power supplies put out more power when they are in an unloaded state, also as ive said in here before becarful with using comp power supplies as the 5v line regulates the 12v when the 5v line is under load. The more you draw on the 12v line the higher the voltage will be on the 12v line if you dont use the 5v aswell.
Trev |
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| kindas |
If the componet is intended for use in an automobile it will be ok at 15 volts. A car is rated at twelve volts but when it is running it normally puts out between 14.4 and 15.5 volts. The charging systems in cars run higher to charge the battery and also run accessories faster. Just thought I would add my 2 cents
Thanks |
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| JC-21 |
Hello.
The above is true and helpful.
I have just put a meter to a 120VAC to 12VDC power supply.
(One that just plugs into the wall)
It reads roughly 15.7VDC out.
My meter is not a true RMS meter, but accurate enough to affirm - when not under load - that power supply put out more than the rating reads. - We figured it would right?
Current draw is another part.
The 7A rating means that it could supply 12VDC to up to (7) one Ampere devices...(as mentioned already) without burning.
That is to say that it is the maximum rating.
The actual current draw depends entirely on what device is connected (or drawing current).
i.e.: 120VAC in your home... 60W light bulb, compared to 100W light bulb...the 60W light bulb draws ~0.5 A, while the 100W light bulb draws ~1.2 A. The 100W bulb draws more because it can...the filament is larger than the 60W filament.
All the while, the circuit breaker is offering a 15A maximum output.
The Voltage 120VAC is constant...(or at least that is what the Electric Company tells us...:)
120VAC X 15A = 1800VA (VA can easily be confused for W, and for all intent and pupose... that is OK.) so, 1800W is the maximum output power in alternating current at the wall, for that circuit. Transients aside, you could hook up (30) 60W light bulbs without the circuit breaker tripping, but maybe not (31). Or you could hook up (18) 100W light bulbs without the circuit breaker tripping, but not (19).
Same as a straw from Harvey's vs. a straw from Wendy's. Try to "draw" the same type of drink up through both, with about the same force - and you will find that there is more "current flow" through the Harvey's straw. (Because it is larger there is less resistance).
You might have already hooked it up and it works fine. That is my bet anyhow. Hope this helps either way!
-Jayson- |
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