Tesla Powerwall 2

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Tesla Powerwall 2

Postby Gordon-Loomberah » Wed Nov 23, 2016 5:00 pm

The recent announcement of the 2nd generation Tesla Powerwall sure has shaken up the storage market! Will this be the battery that starts a flood of people into storing their own energy?

I'd given up hope of seeing any quick reductions in the price of storage, after seeing the pricing on most of the currently available batteries, where some of the prices really were eye wateringly high! :shock: As I wrote about the Bosch system a while ago...
>>for the same money you could buy 3 of them, or buy a Tesla car and have a bit more storage capacity, plus you get an awesome car for no extra cost!

Now the situation has changed! Tesla really have stirred things up with the Tesla Powerwall 2, and I'd expect their competitors will have to drastically drop their prices, or be left out of the new storage market.

There will be 2 versions of the battery, the Powerwall 2 DC, with 13.5kWh of capacity, and the Powerwall 2 AC, with 13.2kWh of capacity. Both run at a nominal 50V internally, and a DC to DC converter presents a much higher voltage to the outside world on the DC version, 350-550VDC. The AC version has a range of nominal output AC voltages, to match a variety of configurations.

A maximum continuous power delivery of 5kW, and a 10 second 7kW peak, puts it squarely into the useful range IMO- you can run the electric jug and the dishwasher at the same time!

I've only seen preliminary pricing, but I think this may give some DIY systems, such as I run myself, a good run for their money when you consider benefits such as the 10 year warranty, which certainly gives peace of mind. I've had a CALB cell fail after only a few years, and there was no warranty coverage, despite me being able to show its performance had been non-standard since not after it was installed.

The Powerwall 2 wont be available in Australia for a few months yet, but I'm expecting them to sell like hot cakes.

Energy Matters have a page up with more info here: http://www.energymatters.com.au/residen ... l-battery/
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Re: Tesla Powerwall 2

Postby Gordon-Loomberah » Thu Nov 24, 2016 10:29 am

A bit more info - For an off-grid system you can stack multiple Powerwalls and AC couple with inverters from SMA, Fronius and SolarEdge at this stage. However, there is no word yet on generator integration.
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Re: Tesla Powerwall 2

Postby karrak » Wed Nov 30, 2016 12:57 am

Thanks for the information Gordon, there is some more technical information and details of the warranty here, http://www.solarquotes.com.au/blog/powerwall-2-warranty/

One question I have is how will the Powerwall 2 work offline with the inverters you have mentioned. Are these grid connect inverters that are running in island/backup mode?

Thanks

Simon
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Re: Tesla Powerwall 2

Postby Gordon-Loomberah » Wed Nov 30, 2016 7:15 am

At this stage yes for the Fronius and SolarEdge, yes but as SMA have off-grid inverters too, I think there are models to run either way for them
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Re: Tesla Powerwall 2

Postby karrak » Wed Nov 30, 2016 10:35 am

I am wondering if it would be possible with the grid connect inverters to put a generator on the inverter's grid connection and charge the battery this way?

I would think this would only work if you could program the inverter not to export power to the grid and it would be preferable if you could limit the power input from the grid (generator) so that you could use a small generator.

Simon
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Re: Tesla Powerwall 2

Postby davidg » Wed Nov 30, 2016 8:52 pm

karrak wrote:I am wondering if it would be possible with the grid connect inverters to put a generator on the inverter's grid connection and charge the battery this way?

It's been tried it's not really successful.

AC coupled solar with inverters designed for the purpose do work and work very well.
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Re: Tesla Powerwall 2

Postby karrak » Thu Dec 01, 2016 7:28 pm

davidg wrote:
karrak wrote:I am wondering if it would be possible with the grid connect inverters to put a generator on the inverter's grid connection and charge the battery this way?

It's been tried it's not really successful.


Can you tell me what the problems have been?

Thanks
Simon
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
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Re: Tesla Powerwall 2

Postby Gordon-Loomberah » Fri Dec 02, 2016 4:29 pm

Finn Peacock has graphed out the actual warranty periods depending on usage patterns in a RE article today here:
http://reneweconomy.com.au/graph-day-po ... day-34430/
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Re: Tesla Powerwall 2

Postby lantern » Sat Dec 03, 2016 8:28 am

Beats all others for value for your $$

http://reneweconomy.com.au/graph-of-the ... ice-62928/
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Re: Tesla Powerwall 2

Postby Gordon-Loomberah » Fri Mar 03, 2017 12:51 pm

It seems that the DC version of the Powerwall 2 is no more, leaving just the AC version with built-in inverter.
The AC version has been delayed too, and perhaps delayed some more, with Ron Brakel's blog on Finn Peacock's Solar Quotes site suggesting June for the first installations.
https://www.solarquotes.com.au/blog/tes ... #more-9611
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