sakumar wrote:Is there a cost advantage to installing the Powerwall?
At a more basic level: What problem does Powerwall solve?
The only obvious one that I can see is it provides a way for Tesla to sell more automotive battery packs so that he can try to fill his Gigafactory.
But I don't think a battery pack (originally) engineered for an automobile makes a good wall hanging. I have to wonder if these are already in use today for remote supercharger stations. That application has high value for Tesla and makes a decent amount of sense, but I don't see the same value for hom use.
Even ignoring the hazards mentioned, this thing will simply waste power if hung outdoors on an outside wall in a hot climate.
So, what is the main application?
- Backup generator replacement?
- Off-grid PV?
- Grid-tied PV with backup?
- TOU shifting?
Of all of those, only TOU shifting seems to provide a way for the unit to try to pay for itself. But at a 2kW power rating, you would need a bunch of these for most homes with central air conditioning. But it needs an inverter to have any use. I agree that Solar City will be involved if there are PV applications here.
Frankly, I think Enphase is more on track with their AC Battery. It's small enough and cheap enough for people to experiment with it while still being scalable to large applications.