Tesla Battery as a power supply?

What I have in mind is a stack of hydrogen fuel cells.  

geofkait, I am onboard with Hydrogen . The closest energy we have to perpetual. 
But in reference, to the OP, are you considering batteries as a source of power for components as direct power or using an inverter to convert DC to AC?
I have been curious about audio manufactures not investing more in battery sourced power for cleaner power supply. A few years ago there were a few companies displaying battery powered components at RMAF, and I really haven't seen much if anything in publications to indicate continued interest.  Has anyone seen much on battery powered components.

I was just thinking that if the battery can store electricity from either the grid or cells on the roof it would be a natural buffer to line noise, and that might have some sonic value. 

Not really directly related to the Tesla question, but I played around with using banks of lead acid batteries to power phono preamps. They were quiet but the life and soul disappeared compared to mains power.

I'm on Duracell battery power for my Sony Walkman CD Player and I hear less distortion and noise compared to house power.  

I have a friend who powers his front end/preamp from a bank of lead acid batteries with an inverter essentially to combat frequent power outages. Many inverters do not provide the pure sine wave output that is ideal for audio components. My friend reports some sonic benefits from his setup. I too have experimented with various types of battery directly powering a music server and find that each battery contribute its own sonic signature. Batteries are not noiseless and ideally need to be carefully selected and filtered in some way. In an audio system the battery will impact the sound just like any other component. Personally, I’d be hesitant to spend $3500 on a battery to find out whether I’ll like how it sounds.

I should point out that I did not use inverters but directly applied Vdc directly to the B+ feed with the rectifier disconnected.