HOW TO CALCULATE A POWER SUPPLY …?
Step 1 – Check if the input of your strip is 12V
Step 2 – Check how many watts per meter your LED strip will consume
Step 4 – Calculate the estimated power usage
-Total length of led strip of 30 led/m used for progect is 10m : 10m x 7.2w = 72w
Step 5 – Understand the rule of 80%
-When choosing a power unit, it’s a good idea to make sure you are only using 80% of the rated power maximum to increase longevity of the power supply and keep it cool to prevent overheating: 72w / 0.8 = 90w
Step 6 – Put it all together to determine the amps of power supply you need
-Amps = Power / Volt 90W / 12V = 7.5 A
You talk about 5050 LEDs. Consumption is about 0,2W per LED.
In my case, I have 15 stairs. I think I will put a 300LED/roll. So I’ll have 40 LED/stair. My total consumption will be 0,2*40*15 = 120W.
But I see that 3825 LEDs’ consumption is about 0,08W (per LED).
With this, it would be 0,08*40*15 = 48W…Better.
My questions are :
- Is my calculation correct ?
- Are the 3825 LEDs sufficient ? (since it’s only to have light at night I guess it’s OK, but maybe I’m wrong)