Tesla Powerwall 2 is a game changer

Tesla Powerwall 2 installed

Yesterday Tesla unveiled the Powerwall 2 and the Solar Roof.

I think that the Solar Roof is more of a fashion thing, regular solar panels look great to me and are easier to install than hundreds of tiny solar cells in the form of roof tiles. But the Powerwall 2 is different, it’s really revolutionary regarding home energy storage. Not only it’s more affordable, is also easier to install than regular energy systems.

The Powerwall 2 has a Liquid thermal control system, so we don’t have to worry about cooking the battery in hot climates nor poor performance in cold places. It also has an internal DC/AC inverter, this saves us money in extra components and it also makes the installation a lot simpler.


For a price of 5.500 USD, about 5.006 €, let’s see what we get.


Tesla Powerwall 2 specs

Tesla Powerwall 2 specs


Now compare to the first generation Tesla Powerwall.


Tesla Powerwall specs

Tesla Powerwall specs


Don’t forget that now, not only the Powerwall 2 has more battery capacity, it also has an integrated AC/DC inverter. This makes it much better than the first generation.


In May Nissan announced its Powerwall alternative, the xStorage, that has a 4,2 kWh battery capacity and costs 4.000 € – with installation and cables included.


Nissan xStorage installed

Nissan xStorage installed


When these energy storage battery systems get even cheaper they’ll make easier the job of building a DIY electric car in your garage. Instead of using the battery on the wall, put it inside an electric car you just made. Then you’ll have energy storage on wheels.


Volkswagen Nils concept car

Volkswagen Nils concept car


The Volkswagen Nils powered by a 20 kWh battery that could also supply the grid would be the ultimate Powerwall on wheels. This is exactly what a Vehicle-to-Grid (V2G) system does and it would be awesome if the Tesla Model 3 gets this feature…


Powerwall or V2G?

Powerwall or V2G?


Tesla Powerwall 2 is now being built in the Gigafactory and first deliveries should happen in December in places like California, the rest of the world needs to wait a little longer. But it’ll worth it.


What do you think? Would you rather have an energy storage system on your wall or integrated in your electric car? Or even better, why not both?!



More info:



Pedro Lima

My interest in electric transportation is mostly political. I’m tired of coups and wars for oil. My expectation is that the adoption of electric transportation will be a factor for peace and democracy all over the world.

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5 years ago

I have sent Tesla an email ( to : [email protected] ) that I doubt they will reply to. Copying it here as well as so far Tesla only posted vaporware without posting real specs and questions regarding integration with existing or future solar systems with features such as AC coupling and frequency shifting.


5 years ago

my message was cut. copying it again.

I have seen Elon Musk´s presentation on the Tesla Powerwall 2 and I have to say product looks to be fairly innovative.

A big thumbs up to you guys.

As I am starting to build my house in Portugal I am considering to add one or two Powerwalls 2 to my house once complete.

Have some questions If I may that will appreciate if you can clarify.

The Tesla Powerwall 2 comes with an integrated inverter. Is it an inverter that accepts AC coupling and frequency shifting for solar panel installations using for instance an SMA Sunny Boy TL5000 ?

What can be configured in the powerwall in terms of usage algorithms?

Besides the Powerwall is it required other equipments to control loads and usage? What other equipments can be used together with the powerwall 2? Do you also support wind turbine AC inverters?

What kind of solar panels and MPPT inverters can be used?

If 2 powerwalls are used does output rate double or remain at 5kW?

Will it be possible to purchase it in Portugal?

Best Regards,
Carlos Carvalho

5 years ago
Reply to  Pedro Lima

So you agree that so far this is just pure marketing. Fluff but no substance. Also Tesla now is on the verge of an all or nothing suicidal strategy.

They are at war with oil companies and car manufacturers. Now they just started a new war against SMA, Fronius, Edge Solar to name a few.

The more frontlines you are at the less focus you will have and likelihood of making mistakes increases.

Elon may be a case of hubris.

5 years ago
Reply to  Pedro Lima

What I mean by marketing with fluff but no substance is that Tesla so far didn´t clarify how the powerwall 2 connects to a solar system and if they cover AC coupling, frequency shifting technologies.

Pedro araujo
5 years ago
Reply to  Pedro Lima

Hi Pedro where can i find more details about the powerwall reaching Portugal next year? Is that a portuguese government decision, or Tesla doesnt think its worth to sell powerwalls in Portugal? I was thinking if your Electrical supplier EDP as a saying on that also.

5 years ago
Reply to  sapcmc


will try to answer …

AC coupling means you can use it with any existing PV inverter so also SMA.
Also wind trubine AC inverter if grid connected.

2 energy meter will be needed 1 for generation ( PV/Wind) and 1 for grid (infeed/outfeed).

If the PW2 is hybride you can also connect PV arrays (no info jet).

Up to 9 PW2 in parallel means you will have max 9×5 kW output i am estimating.

I am estmating 3Ph+N Grid connection.

Tesla will sell this Worldwide of corse.



5 years ago

If for EDP we would still live in the stone age. They give no crap about powerwalls or autonomous energy production / management. That is totally against their monopolistic interests.