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Homeowner Blog

Home Battery Storage Prepares for Blast Off in 2019

Erica Charles 14 Dec 2018

With 11 days to go until Christmas, Michelle Obama has launched her bid to join Christmas bestseller lists across the globe, Simon Cowell et al have launched their usual bid for the Christmas Number 1 song slot, and the nation prepares once more to vote in the Strictly Come Dancing final tomorrow.

A similar end-of-year flurry is taking place in the home battery storage market, all with a view to turbo-charging the market in 2019.

In the last few weeks:

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Topics: Social Energy, Tesla Solar Battery, Powerwall2, Powervault 3

Spirit Moves the Market: Tesla Powerwall 2 and Powervault 3 Warranty Updates

Erica Charles 13 Jul 2018

Four weeks ago, we compared the warranties of Tesla’s Powerwall 2, Powervault 3 and Pylontech.

This week, both Powerwall 2 and Powervault 3 have updated – and improved – their warranties.

Powervault has in fact changed the underlying chemistry of its battery and launched GridFlexTM, but more on that next week…

For Powerwall 2 customers, the update is retrospective which is good news for our Powerwall 2 customers.

Now to the fine print….

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Topics: Powervault 3, Solar PV battery storage, Tesla Solar Battery

PylonTech, Powervault, Powerwall 2... What's In the Warranty?

Erica Charles 12 Jun 2018

Following our analysis of Powervault 3 vs Powerwall 2, we had a couple of requests for a review of the SoFar / Pylontech residential battery storage system.

On the face of it, the SoFar / Pylontech combination offers good value, flexible sizing, and LFP (Lithium Ferro Phosphate) chemistry… so well worth consideration.

And that's before you appreciate the fun to be had when trying to summarise the essence of the different warranties: Pylontech vs Powerwall vs Powervault.

Here goes…

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Topics: Powervault 3, Solar PV battery storage, Tesla Solar Battery, Pylontech

Powervault 3 vs Tesla Powerwall 2: Back of Envelope Economics

Erica Charles 11 May 2018

Last week our blog compared the chemistry of Powervault 3 (LFP) with the chemistry of Powerwall 2 (NMC).

The basic conclusion was that LFP means "double the life cycles, double the cost." As a rough guide, for someone installing Powervault 3 as part of a solar system (thus with a VAT rate of 5%), the rough costs are as follows:

 

Powervault 3

Tesla Powerwall 2

Storage Capacity:

2.5kWh

5.0kWh

7.5kWh

13.5kWh

Rough Installed Cost incl VAT @ 5%

£4,510

£6,060

£7,670

£6,300

Cost incl VAT @ 5% per kWh battery capacity

£1,804

£1,212

£1,023

£467

 

In fact in this case, the cost per kWh of LFP (Powervault 3) is more than double the cost per kWh of NMC (Powerwall 2).

But as we also said, with the 7.5kWh Powervault 3, you buy a minimum guaranteed level of 51,800 storage ‘slots’ upfront. With Powerwall 2, you only buy ’37,000’ slots upfront.

Powerwall 2 will pay for itself much more quickly than Powervault 3, but what does this mean for the overall lifetime economics...?

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Topics: Powervault 3, Solar PV battery storage, Tesla Solar Battery

Powervault 3 vs Tesla Powerwall 2: It's All In The Chemistry

Erica Charles 30 Apr 2018

I have an abiding memory from secondary school of our chemistry teacher pressing ‘play’ on an old video cassette, and there, projected onto the screen at the front of the room, was a video made by what must have been a desperately struggling actor, dressed in yellow tights and a white coat, dancing on a lab bench and singing the 'Periodic Table song'.  

The video served two purposes:

  • it put us off chemistry;
  • it put us off acting.

At least it put me off acting. Kristin Scott Thomas attended the school a few years before I did, and clearly, it didn’t put her off acting (credits include Four Weddings and a Funeral, The English Patient, and most recently Winston Churchill’s long suffering wife in Darkest Hour ). No dancing on lab benches for her just to pay the bills.

To the video’s credit, more than a couple of decades later, I can still remember the first two rows of the Periodic Table. Of course I’ve never used the knowledge, until the advent of home battery storage.

Today, as the second in our series of blogs on Powervault 3, we are studying Lithium Ferro Phosphate (Powervault 3) vs  Lithiated Nickel Manganese Cobalt Oxide (Tesla Powerwall 2).

Don’t worry, ‘Studying’ is over-egging it. We’re looking at the differences from a home battery storage point of view...


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Topics: Powervault 3, Solar PV battery storage, Tesla Solar Battery

Tesla Time-of-Use goes live: is 2018 the year for time-of-use tariffs?

Henry Day 13 Apr 2018

Tesla recently confirmed that their eagerly anticipated Time-Based Control feature for Powerwall 2 is being rolled out to existing systems. 

We are now able to reveal the functionality available (and to confirm that as expected it's pretty comprehensive)...

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Topics: Powerwall2, Tesla Solar Battery

Buy cheap, use peak - a game changer for the UK electricity market?

Erica Charles 30 Nov 2017

Our Tesla rep Jerry came to our office this week to update us on the latest Powerwall 2 developments.

The most exciting thing? Timed charging and discharging is due to go live in January or Feburary 2018.  

Why is this so exciting?

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Topics: Powerwall2, Tesla Solar Battery