LED power supply sizing help

[onetrickpony]

Need help sizing the power supply for my led project

3 pucks ran in series
with each puck having 2 channels per puck
Channel 1 = 12 volts @ 1000ma
Channel 2 = 12 volts @ 1000ma

How many watt power supply do I need

Thanks

 

[griss]

I won’t pretend to understand power supplies for LEDs but, there’s discussion of amps, wattage, and volts in this thread. Or maybe @oreo57 can chime in here.

 

[oreo57]

Need help sizing the power supply for my led project

3 pucks ran in series
with each puck having 2 channels per puck
Channel 1 = 12 volts @ 1000ma
Channel 2 = 12 volts @ 1000ma

How many watt power supply do I need

Thanks

W = VxA
Volts add in series
Amps divide in parallel.

12 x 3 = 36V X 1A = 36W
2 of those is 72W total

Soo exactly how are you going to drive them?
If using something like an Meanwell LDD dc/dc step down driver your power supply needs to output
> 36V. There is about a 3-4v overhead.
40v or greater power supply.. 100w

If you use an ac/dc drive you need to be able to output 36v (plus some.
1000mA (2 drivers approx 40w each) or if parallel/series 2000mA (one driver approx 80w, not a recommended design) as the current setpoint
If you wanted to use just the one driver (no channel control) the ac/dc driver needs to have 72v in its "range"

Keep in mind that whatever you "calculate" you should size up the power supply at least 10%. If using cheap ones probably more like 50%..