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Thu 16 Oct, 2014 02:48 pm
If I would like to operate 10 12V LED lights (rated at 300mA each) on a single circuit, what amperage rating do I need on my 12VDC plug-in power supply? Is it a simple matter of multiplying the LED amperages to get 3A? Or do I gain something in the 110VAC to 12VDC conversion? Thank you. Kenton
@deke503,
deke503 wrote:Is it a simple matter of multiplying the LED amperages to get 3A?
Yes it is. The current draw of each lamp is 300 mA or 0.3 A if you like. 10 lamps will take 3000 mA or 3 A.
@contrex,
Agree however I would used a power supply that can put out at least 5 A as it is never I good idea to run a power supply at it maximum rating.
Quote:Or do I gain something in the 110VAC to 12VDC conversion?
Not sure what you mean here but the AC side will see around 300 ma draw or a little more as the power supply will waste some power.
@contrex,
Thank you very much for your clarification.
@contrex,
Thanks for the clarification.
Know just enough about electronics to be dangerous.
@BillRM,
Your last comment, "...but the AC side will see around 300 ma draw...".
You mean per LED light, not for the string of ten lights. Correct?
@deke503,
deke503 wrote:
Your last comment, "...but the AC side will see around 300 ma draw...".
You mean per LED light, not for the string of ten lights. Correct?
He means 300 mA AC draw if you have 10 lights. On the DC side the lamps are drawing 3 A at 12 volts which makes 36 watts. The AC side is at roughly 120 v and will draw around 0.3 A which also makes 36 watts.
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