am working on a project that requires 2m 5050 4.5 led light strip. i require the lights to be on continuously for 72 hrs+. i connected these up to a 50000 mah power bank via a Usb thinking this would last well over the 72hrs it only lasted 4hrs. Yesterday i connected them to 4 X AA batteries (just the cheap standard ones) and they have lasted over 24hrs though have gotten a lot dimmer. i really don’t understand could anyone explain what is happening it doesn’t make sense to me?. How can 4 AA batteries out last a 50000 Mah power bank ?.
How many LEDs per meter is the strip?
its 60 LEDs per metre
Great, thanks Damien. In our testing, we found that the 60 per meter use ~2.1 A/ meter @5V (Full-brightness white). A very unlikely scenario though, running all LEDs at full brightness constantly.
If your LED strip is anything like ours, this means a 2100mAh 5V battery could power the LEDs for 1 hour (in a perfect world). 50000mAh 5V would last 50000/2100 = 23.8 hours of full white brightness. If you instead have patterns/effects then a few days would be easily achieved in most situations, weeks for some cases.
If you are getting less then that, these thoughts come to mind:
- The 50000mAh battery pack is not taking full charge for some reason
- WS2812 LEDs need around 4.5-5V to operate, it’s possible that your 50000mAh power bank is dropping below 4.5V which creates a reset condition for the WS2812 chips (would “appear” to be off or intermittant)
- Significant energy is being used by something else in the circuit, other than the LEDs.
The second point is perhaps more likely, if you are using anything other than a LiPo battery bank.