I have an idea fro a project which requires a few hundred ws2812 LEDs to be powered using relatively small battery which can be carried. I was wondering how you could power over 300 ws2812 LEDs similar the dress in this Creators Project Video on Youtube:
https://www.youtube.com/watch?v=oo_7s4TrL28
The dress looks like it has atleast over 250 LEDs (assumed to be ws2812s) , and they are all powered with a single rechargeable Li-Ion battery.
My calculations show that
300 LEDs × 60 mA ÷ 1,000 = 12 Amps minimum
How did she managed to power all those LEDs with a single battery one could carry?
Please forgive me for being a noob.
Best Answer
Your calculations are reasonable for every single LED on at full brightness. However, there are a few reasons why the LEDs don't draw this maximum power. So, if you want this dress to work for an hour at max brightness, you need 12Amp hours of energy. That's on the order of magnitude of a small car battery (not as much, but it's a big battery). Also, the voltage plays an important role but let's assume for simplicity's sake that she has a battery that's just the right voltage for her application.... So, why does she only use a "small" battery (for what it's worth, that's a pretty large battery compared to something in your phone)? :
So, 3 amp hours is actually something that a normal spare phone battery can do, or many RC/drone batteries for higher voltage.