The new Tesla Powerwall stores 7-10 kWh. If you could draw the power out at just 5V (you can’t; it delivers 350-450V), you could run a hundred LED pixels for roughly a month per charge.
(Check my math; I approximated wildly and probably dropped a zero or two somewhere.)
Sure you can, it’s what regulators are made for. 
Also, I predict some of those to end up at Burning Man … somehow.
You could make your art project at home, switch it on, crate it up, ship it to the playa on a truck, get there, uncrate it, set it up, let it run for a week, pack it up again, and ship it home – still running.
Unless you’re @Robert_Atkins , in which case it’ll only power your vest for an hour and ten minutes.
LOL! But then he wouldn’t be able to walk the playa …
Model S art car.
Haha what a thought!
I dunno, a 300Wh 12v battery ran liquid eye for a week
Right, so for @Robert_Atkins , that translates to about 5 minutes.
You do have to take into account that the heat out there kills batteries. I get about half the rated charge out there. I wonder what it will do to these.
Your 100 LEDs at full bright draw .03kW in an hour. Given a 90% efficient 450v to 5v buck converter (right! Something to cook your eggs on, too) means you would have 300kWh, or enough juice to light up for 12.5 days. I think.
P(kW) = I(A) × V(V) / 1000
Nope, I was a decimal point out… 125 days
Like I said: a month!
#physicsmath
Joking aside, the Powerwall could be a big deal for a bunch of camps. What does it cost Snow Koan Solar to truck their massive banks of lead acid storage out there? More or less than the $3.5k for a 10kWh Powerwall?
If you can put a small solar array and a Powerwall near every power-using object, do you need shipping-container sized generators and a temporary power grid anymore? Could you run your whole camp for the week on a Powerwall you charged at home?
Agreed @Robert_Atkins this could make a whole bunch of camps a lot less noisy and a fair bit easier to get out there. Only concern would be the temperature issues, would one of these sat in 115 degree weather for a week not run a bit of a risk of overheating and exploding much like any other lithium ion battery? Also I’d really hate to damage my 3.5k battery by leaving it in the sun too long.
I’ll ask around though, Elon is a Burner after all, perhaps he’s taking some out this year?
Also, lithium is just lighter than lead!
The temperatures that cause a problem for LiPo and LiOn aren’t going to apply to the power wall. For a start, they are much slower discharge than the kinds of battery used in their road car or RC models and secondly, the pack is liquid-cooled with a built-in monitoring and management system.
Nearly all lipo fires occur due to abuse, not environmental factors.
Ah… Well it sounds like it was made for the playa then!
I always maintained that Burners would be the ones to crack the engineering required for the distributed grid. Turns out it has been 