diy solar

diy solar

Two tiny LEDs can kill an 1150w battery

erik.calco

Solar Badger
Joined
Nov 3, 2019
Messages
1,170
Location
USA
I have a 12V socket that has two tiny LEDs in it. But they stay on as long as they have power (so you can find the empty socket in the dark -- and it looks kool.) So asked myself, how important is it to have a switch for those lights?

To contrast, the computer I am typing this on uses 292W average with two monitors. So, I can get about 4 hours with an 1150w battery (ignoring inefficiencies and 100% DoD).

The LED lights came in at 34 mA @ 12V. That sounds small, right? 0.034 * 12 = 0.408 watts. Not even half a watt!

9.792 WH / day, or 297 WH per month. Leaving them running for 1 month consumes 1 hour of computer usage. It will take less than 4 months to kill one 1150w battery. It can kill 3+ of those batteries in a year.

This is why Google shows it's cloud prices by the hour.
 
34mA at 12V is grossly inefficient for 2 small LEDs. Those are probably 3V LEDs in series, so half the power is wasted on current limiting resistors. Even then, LEDs are perfectly bright enough even at 10mA, so even more power is wasted.
I would rip those suckers right out for bleeding my precious power ;)
 
Back
Top