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# DomesticLed driver Amps question

Discuss Led driver Amps question in the Electrical Forum area at ElectriciansForums.net

#### NEBITOMI

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Welcome to ElectriciansForums.net - The American Electrical Advice Forum

hello
im beginer, learner actualy!

i have got 150 w (24 v) led driver to feed up 10m led strip (10 w/m)
my question is ; how many amps will flow in the conductor after the driver?
i know this formula : 150/24=6.25 amp will flow between led strip and driver!BUT wil it same amps after the led driver,or not?

or just only this amps will flow? 150/230=0.6
thx

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D

#### Deleted member 26818

Diividing the output wattage by the input voltage is what you do with transformers.
I assume it’s the same with LED drivers, though there are other variables such as forward voltage, etc. Which I’m not that clued up on.

#### Marvo

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150 watts is just the maximum the driver can deliver. If you've got 10 meters of strip at 10w/m it's going to draw a nominal figure of 100 watts at 24 volt.

I = P/V
I= 100/24

I= 4 Amps(ish)

D

#### Deleted member 26818

150 watts is just the maximum the driver can deliver. If you've got 10 meters of strip at 10w/m it's going to draw a nominal figure of 100 watts at 24 volt.

I = P/V
I= 100/24

I= 4 Amps(ish)
I think it’s the primary circuit amperage the OP wants to determine?

#### DPG

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Input power = output power/efficiency of converter. Current can then be calculated.

#### NEBITOMI

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so then how many amp will flow between the circuit braker and transfirmator???

#### Lucien Nunes

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Driver output power is whatever the LED strip consumes - 100W.
Need to estimate driver efficiency and power factor (dependent on specific model of driver). Both might be around 0.9.
Iin = Pout / (Vin x pf x eff) = 100/ (230 x 0.9 x 0.9)
=0.54A

Unlikely to be less, might be more if driver pf is low. Also doesn't allow for inrush.

#### telectrix

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if the load is 100 watts, then the 240V current will be 100/240 = 0.417A ( slightly more allowing for efficiency loss ).

#### Marvo

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I think it’s the primary circuit amperage the OP wants to determine?
Oops, apologies if I misread it....

#### Marvo

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.......and power factor (dependent on specific model of driver). Both might be around 0.9.......
A handful of the high-end LED's might be 0.9, I've come across power factor as low as 0.45 on cheaper LED's. It's always worth checking....

#### NEBITOMI

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A handful of the high-end LED's might be 0.9, I've come across power factor as low as 0.45 on cheaper LED's. It's always worth checking....
please explain what is that mean? how to check? and how to calculate ??

#### Marvo

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please explain what is that mean? how to check? and how to calculate ??
The power factor is published by the manufacturers in their data sheet which is usually available on their website.

Measurement of power factor yourself isn't easy. Testers that measure power factor are generally very expensive, there are some cheap instruments that give you a power factor reading like this one but they're likely to be inaccurate.

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