On-grid domestic battery storage

Sterlingtimes

My metered export per annum is 676 kWh (about 20% of PVGIS).

If I retain this electricity through the use of batteries then I save 676 * 0.1175 = £79.43 less earnings from export 676 * .0503 = £34.00. Net savings from batteries is £45.43 per annum. In 10 years, I would save £454.30. But a ten-year system costs £5,000.

Have miscalculated?

Martyn1981

Sterlingtimes wrote: »

My metered export per annum is 676 kWh (about 20% of PVGIS).

If I retain this electricity through the use of batteries then I save 676 * 0.1175 = £79.43 less earnings from export 676 * .0503 = £34.00. Net savings from batteries is £45.43 per annum. In 10 years, I would save £454.30. But a ten-year system costs £5,000.

Have miscalculated?

No I think you've got that right. So you might not want to bother, or need to wait for a small battery system to fall a long way in price.

Sterlingtimes

Martyn1981 wrote: »

No I think you've got that right. So you might not want to bother, or need to wait for a small battery system to fall a long way in price.

Thank you, Martyn.

I suppose there is a possibility of bringing Economy 7 into the equation and then charging at night and consuming during the day.

zeupater

Sterlingtimes wrote: »

My metered export per annum is 676 kWh (about 20% of PVGIS).

If I retain this electricity through the use of batteries then I save 676 * 0.1175 = £79.43 less earnings from export 676 * .0503 = £34.00. Net savings from batteries is £45.43 per annum. In 10 years, I would save £454.30. But a ten-year system costs £5,000.

Have miscalculated?

Hi

Agree with Mart ... with your obviously high daytime use there's not much to squirrel away for later use & most of that would be in the summer anyway ...

For most it doesn't really start to make any sense unless costs fall to somewhere around £100/kWh of storage (fully installed) ... unfortunately the lowest cost units in the UK are currently around 4x to 5x this figure and that's for larger capacity systems so there's a long way to go yet!

Don't get too discouraged though ... looking at the automotive sector there are options to buy vehicles with either leased or purchased battery packs ... applying the cost difference directly to the battery capacity gives a rough indication of the margins that are being sought by the domestic storage suppliers ... 'make hay' seems to be the motto in that sector at the moment so it really does need the government to encourage product consumerisation as opposed to allowing big business to control the storage sector ...

HTH
Z

Martyn1981

Martyn1981 wrote: »

Some news just regarding the market and the direction it will probably go in. This is one of the items in the week's Carbon Commentary newsletter from Chris Goodall:

In twenty years’ time, this will be the pattern worldwide: batteries will be provided by utilities or third parties who will offer ways the residential customer can save money but will retain final control over whether the battery is charging or discharging at any particular moment.

Seems he had a point:

Solar and batteries to deliver first UK virtual power plant powered by residential assets

The distribution network operator (DNO) has agreed a bi-directional contract with Powervault, which will install 40 8kWh batteries in the London Borough of Barnet to aggregate 320kWh of energy storage capacity and deliver localised flexibilities.

The batteries will charge from solar panels installed on the homes, as well as being topped up by off-peak electricity from the grid, to create London’s first virtual power station via Powervault’s aggregation and control platform.

UKPN will offer an availability payment for a two hour period within the evening peak (5:30-7:30pm) during which time they will be able to call on the combined capacity of the solar-charged batteries to discharge in unison to relieve pressure on the electricity network. Residents would then benefit from utilisation payments between December 2018 and February 2019.

djmattc

No new information from me, but just asking some advice on this.
Reading through this thread (which is very interesting) I came across the iSolar solution. It seems like a great idea. However, I don't have water storage and therefore no immersion heater. My combi-boiler does need replacing. Obviously this provides hot water and heating with gas. Is there a solution where I can get my combi boiler replaced with a new system which does the same thing but additionally stores water and has an immersion heater so I can take advantage of iSolar?

Martyn1981

This article probably should be on the Green energy news thread, but I thought it worth mentioning on here, as yet another source of demand for batteries, which will eventually (I'm boring myself with this never ending promise) lead to lower prices when supply catches up.

So, you have a business with loads of leccy consumption, and variable leccy rates, so ....... you add some batts, seems fair.

Irvine Ranch Water District Adds Tesla Powerpacks, Estimates Annual Savings of $500,000

The Irvine Water District and Michelson Capital announced the completion of the nation’s largest behind-the-meter energy storage project at the Irvine Ranch Water District’s (IRWD) Michelson Water Recycling Plant. The new 2.5MW/15MWh installation is a part of a distributed network of 11 energy storage installations at the water district’s recycling and pumping facilities that together total 7MW/34MWh.

Coastalwatch

Martyn1981 wrote: »

This article probably should be on the Green energy news thread, but I thought it worth mentioning on here, as yet another source of demand for batteries, which will eventually (I'm boring myself with this never ending promise) lead to lower prices when supply catches up.

So, you have a business with loads of leccy consumption, and variable leccy rates, so ....... you add some batts, seems fair.

Irvine Ranch Water District Adds Tesla Powerpacks, Estimates Annual Savings of $500,000

Thanks for that Martyn. I'm not holding my breath either, but one day cost effective home storage must surely come along. Another article on that link was about John Goodenough and a Solid state L'ion battery being worked upon which may also be of interest!


https://cleantechnica.com/2018/06/26/the-solid-state-lithium-ion-battery-has-john-goodenough-finally-done-it/

Coastalwatch

Nothing new or groundbreaking but home storage and it's current cost has made it on to the BBC news website!


https://www.bbc.co.uk/news/business-44540726


Can't do any harm, can it?

Martyn1981

Coastalwatch wrote: »

Nothing new or groundbreaking but home storage and it's current cost has made it on to the BBC news website!


https://www.bbc.co.uk/news/business-44540726


Can't do any harm, can it?

"But we expect that battery costs could fall by 50% by 2025. If this happens, battery installations will grow significantly, boosting renewable energy penetration further and reducing the role for fossil fuel generation."

Patience Mart, patience. :drool:

Nice that they mention selling leccy. That might be the way to make the costs add up if we can sell our kWh's at peak demand prices. It's working well in Australia, but then their annual peak demands are in the summer (January(ish)), when batts will be full of PV leccy, but we shall see.