Tesla Wants to Build a Battery for Your House

[jtstott]

Given 3,000 cost, payback is about 12 years with this use case. Not sure if its $3,000 installed or not... This also assumes that your home uses at least 7KWh/day during peak hours of course.

$3000 is the wholesale cost, then you figure in retail mark up & install. You are probably looking close to double $$/

[Alisobob]

Given that the 7KWh battery can shift 7KWh/day, and given the WE Energies rate difference of about .10/kwh we get .70/day saved or about $255/year.

solar98.JPG

SCE has credited me almost that much... in three months. This is after solar has provided for 99% of my use.

Go Solar!!

[kwilcox]

$3000 is the wholesale cost, then you figure in retail mark up & install. You are probably looking close to double $$/

There's no empirical data that I could find anywhere on the site to support the contention that $3,000 was not the cost I'd pay if I reserved a 7KWh battery today. Do you have this data? Agree that installation costs are probably extra but I was doing "rough numbers". I'm not saying this is an incentive to buy one either: the guarantee is only for 10 years I believe.

[kwilcox]

[ATTACH=CONFIG]6654[/ATTACH]

SCE has credited me almost that much... in three months. This is after solar has provided for 99% of my use.

Go Solar!!

Agree on that. Here's output from my 4KW system.



However, right now, grid-tie is good, but demand charges can change this. POCOs need to do demand charges and I agree with them, however, they can do it cheaper once they have cheaper energy storage systems. Local placement of large storage systems not only supports renewables, but also reduces load on transmission lines.

[jtstott]

There's no empirical data that I could find anywhere on the site to support the contention that $3,000 was not the cost I'd pay if I reserved a 7KWh battery today. Do you have this data? Agree that installation costs are probably extra but I was doing "rough numbers". I'm not saying this is an incentive to buy one either: the guarantee is only for 10 years I believe.

http://www.teslamotors.com/presskit/teslaenergy

"Tesla’s selling price to installers is $3500 for 10kWh and $3000 for 7kWh. (Price excludes inverter and installation.) Deliveries begin in late Summer."

https://www.yahoo.com/tech/s/tesla-powerwall-know-070002302.html

"SolarCity will install Tesla's batteries for $5,000 (which is on top of the $3,500 price tag for the battery itself)."

[bberry]

There's no empirical data that I could find anywhere on the site to support the contention that $3,000 was not the cost I'd pay if I reserved a 7KWh .........

You can reserve one and get your price.

The reservation process should tell you the distributors in your area, if any. This battery will likely only work with inverters designed specifically to the unit. The Powerwall does not appear to be designed for end user installation.

[kwilcox]

Based on that data, I concur that it doesn't sound like any kind of deal. Even @ 3K installed, optimal payback is 2 years after the guarantee expires.

[ericf1]

Given that the 7KWh battery can shift 7KWh/day, and given the WE Energies rate difference of about .10/kwh we get .70/day saved or about $255/year.

And the math gets worse when you assume system efficiency (approx 90%) and battery degradation over time. Then, probably double the price for additional equipment, materials and installation = throwing money away. Hopefully, the early adopters don't mind, and we will have an affordable option 5 or 10 years down the road.

[Sunking]

Thats what I thought, only a guess.

No that is where you start. Next you look up thee Patent and UL applications.

Tesla is using the same batteries they are using in the S model car. If you know anything about batteries, the most basics of physical properties, is that batteries physical size in volume and weight are directly proportional to the energy capacity contained within them. A 10 Kwh battery is going to be 42% larger and heavier than a 7 Kwh battery. It is simple 5th grade math.

[Sunking]

Based on that data, I concur that it doesn't sound like any kind of deal. Even @ 3K installed,

You cannot touch it for $3000, that is wholesale price to dealers. $7000 if you want one outright.

[russ]

It is simple 5th grade math.

I expect that these days it may be high school math.

[Willy T]

No that is where you start. Next you look up thee Patent and UL applications.

Tesla is using the same batteries they are using in the S model car. If you know anything about batteries, the most basics of physical properties, is that batteries physical size in volume and weight are directly proportional to the energy capacity contained within them. A 10 Kwh battery is going to be 42% larger and heavier than a 7 Kwh battery. It is simple 5th grade math.

Then why did you say this ?? Maybe your lost or having a bad day remembering anything. looks like the math is your problem. Guessing again.

Only difference between them is the firmware to restrict the DOD. Both are a 400 volt 25 AH battery (10 Kwh). Same cabinet, exact same dimensions, exact same weight, exact same battery, just different firmware in the code that restricts DOD.

[kwilcox]

You cannot touch it for $3000, that is wholesale price to dealers. $7000 if you want one outright.

Speculative (likely an educated guess however given your background) but irrelevant since my statement was a best possible rough guess that still won't pan out. Its not a good deal assuming optimum pricing and zero degradation over time.

[Sunking]

Then why did you say this ?? Maybe your lost or having a bad day remembering anything. looks like the math is your problem. Guessing again.

Just where is the problem? No guesses, just physical facts. The battery is 400 volts @ 24 AH aka 10 Kwh in both models. 7 Kwh is restricted to 70% DOD.

[Willy T]

Just where is the problem? No guesses, just physical facts. The battery is 400 volts @ 24 AH aka 10 Kwh in both models. 7 Kwh is restricted to 70% DOD.

The 10 kw is restricted to ??