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Last updated: 13 March 2024

Reduce Your Energy Bills with a Powervault Solar Battery

Powervault 3 GridFLEX earn money

What is a Powervault Solar Battery?

The Powervault is a solar battery system that’s designed to give you value by making your home more energy-efficient. You can reduce your energy bills through either storing energy generated from your solar panels, or by charging the Powervault through the grid only during off-peak hours.

Powervault is a London-based company which started in 2012 with the aim to lower people's electricity bills as well as their carbon footprint. They work alongside energy suppliers and the National Grid to help accelerate the U.K.’s goal to reach net zero emissions by 2050.

Being a British company it means they keep the needs of British homes and businesses in mind every step of the way when creating their products. Plus, since all of their products are designed and assembled in London, this reduces the carbon footprint as they don’t have to be shipped from abroad.

There are a few different Powervault batteries on the market. The Powervault 3 is made from lithium-polymer, while its more eco-friendly version, the Powervault 3eco, is made from recycled lithium-manganese-oxide. An older model, called the Powervault G200, has both lead acid and lithium-ion versions.

The Powervault 3 has a wide range of energy capacities to choose from, making it suitable for most homes whatever their size or budget. On top of that, Powervault’s batteries don’t require an additional solar inverter, which will save you an extra cost.

Solar battery system costs typically range between £1,200 and £14,800 depending on their capacity, life cycle, and materials. This means you could save a substantial amount of money just by comparing the current prices of solar batteries.

If you would like to enjoy the convenience provided by solar battery storage systems, fill in our form by clicking the button below to get up to 3 tailor-made quotes from our trusted solar battery suppliers and installers. This service is offered free of charge and without any obligations.

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Powervault 3 Specs: Capacity, Battery and Dimensions

Powervault battery

The Powervault 3 is available in five different sizes – 4, 8, 12, 16, and 20 kWh. Therefore, it is suitable for most homes no matter the energy usage. It has a Depth of Discharge (DoD) of 100%, so the usable capacity is the same as the total capacity for each battery size. It can deliver 3.3 kW of power continuously and 6.6 kW of peak power in short 1-second bursts.

The batteries are also modular and scalable, so you can easily add capacity in the future.

Furthermore, the Powervault 3 comes with two DC-inputs (direct current inputs) so you can connect it directly to your solar panels. This means you don’t need a separate inverter which will essentially save you about £1,000

The Powervault 3’s dimensions range from 120 x 98 x 25 cm to 205 x 98 x 25 cm depending on the size you get. All sizes can be floor-mounted while smaller capacity units can also be wall-mounted, provided the wall is stable enough.

There is also a more environmentally friendly version of this battery called the Powervault 3eco. What makes it more environmentally friendly is the fact that it gives batteries from old Nissan and Renault electric cars a ‘second life’. As a result, the Powervault 3eco also comes at a lower cost.

The warranty of the Powervault 3eco is only 3 years compared to the standard version’s 10-year warranty period. However, it’s important to note that 3eco’s batteries are rigorously checked and not subpar by any means. They simply just have a shorter lifespan compared to the Powervault 3.

One important thing to note is that backup is not included with the Powervault 3, meaning that it cannot be used during power cuts. Therefore, if you are in an area where power outages are common then this may not be the battery choice for you. However, if power cuts are rare then the Powervault 3 is probably more cost-effective, as being able to use a battery as a backup energy source usually adds to the total price.

We’ve summarised the Powervault 3 and Powervault 3 Eco’s specs in the tables below:

 
Powervault 3
Size

4 kWh

8 kWh

12 kWh

16 kWh

20 kWh

Battery Type

Lithium-polymer (Li-MNC)

Total Capacity (kWh)

4.1

8.2

12.3

16.4

20.5

Usable Capacity (kWh)

4.1

8.2

12.3

16.4

20.5

Depth of Discharge

100%

Power Input (AC)

6.6 kW peak / 3.3 kW continuous

Power Output (AC)

9.2 kW peak / 4.6 kW continuous

11 kW peak / 5.5 kW continuous

Charger / Inverter

5.5 kW / 5.5 kW

Life Cycles

> 6,000

Dimensions
(H x W x D cm)

120 x 98 x 25

120 x 98 x 25

149 x 98 x 25

177 x 98 x 25

205 x 98 x 25

Weight (kg)

129

179

229

279

329

Warranty

10 years

Powervault 3eco
Size

4 kWh

6 kWh

8 kWh

Battery Type

Recycled Lithium-manganese-oxide (LMO)

Total Capacity (kWh)

4.5

6.75

9

Usable Capacity (kWh)

3.9

5.9

7.9

Depth of Discharge

90%

Power Input (AC)

7.0 kW peak /

3.5k W continuous

7.6 kW peak /

3.8 kW continuous

7.6 kW peak /

3.8 kW continuous

Power Output (AC)

7.0 kW peak /

3.5 kW continuous

10.4 kW peak /

5.2 kW continuous

11 kW peak /

5.5 kW continuous

Charger / Inverter

3.8 kW / 5.5k W

Life Cycles

> 1,500

Dimensions
(H x W x D cm)

120 x 98 x 25

149 x 98 x 25

177 x 98 x 25

Weight (kg)

129

179

276

Warranty

3 years

To learn more about specs and other manufacturers, check out our page on the best solar batteries on the market.

Benefits of a Powervault 3

You might be wondering whether purchasing a solar battery is really worth your time and money alongside installing solar panels. There are definitely many benefits to installing a solar battery that we recommend you consider. However, the benefits vary slightly depending on the brand and type of battery.

Below we’ve listed the benefits of the Powervault 3, so you can stay informed and assess whether it’s a good match for you and your home:

  • Become energy-independent: Powervault 3 enables you to reduce your reliance on the National Grid. It allows you to maximise your use of clean energy while also letting you minimise or completely eliminate your use of electricity from the grid.
  • Monitor your energy use: Powervault has a platform called the Customer Portal where you can monitor your energy use. There is also a smart tariff controller so you can optimise your charging schedule.
  • Easy installation: Powervault claims their batteries can be installed within about 3 hours. It’s easy to install as it’s an ‘all-in-one’ system, meaning it includes batteries, a Battery Management System, an Energy Management System and various control boards. Therefore, you’re not required to buy any extra hardware.
  • Compatible with all solar systems: The Powervault 3 is compatible with all solar PV systems as it’s an AC-system (alternating current system). Therefore, you don’t need to worry about whether they're a match to your current system or not, and don’t need to buy any additional parts.
  • Safe technology and no maintenance: All Powervault products have undergone rigorous safety checks, and all have EMC (Electromagnetic compatibility) and CE (Conformité Européene) certification. The batteries require no maintenance, saving you money, and include 10 safety devices including overvoltage protectors and temperature sensors.
  • Environmentally friendly: Powervault collaborates with the National Physical Laboratory to better understand the effects their products have on the environment. They’ve calculated that the Powervault 3 and Powervault 3eco can reduce CO2 emissions by more than 300kg a year in the average U.K. home. Furthermore, if you go with the Powervault 3eco range, you’ll be giving batteries a ‘second life’.
  • Increases property value: A complete solar installation is a great plus for potential buyers as it adds value to the property and helps reduce energy bills. Solar Energy UK analysed more than five million properties and found that a solar installation could increase a property’s value by £1,891 - £2,722.
  • Customer Service: Powervault is a British company based in London. This means they can offer more hands-on and timely support for their customers compared to brands that are based abroad. It’s also reassuring to know that they have engineers available to visit your home if any concerns were to arise.

How does a Powervault 3 help you reduce energy costs?

First of all, the Powervault 3 is known for being affordable compared to, for example, how much the Tesla Powerwall costs. Furthermore, on top of their great initial price, you can simply reduce your energy bills by up to 50% by storing your solar energy during the day and discharging it in the evening.

Below are two further ways you can reduce your energy costs:

  • Smart tariff compatibility: Electricity tariffs are currently increasing at a rate of more than 6% a year. You can store any excess solar energy for later use, however, if you need to charge from the National Grid, Powervault can help you get the cheapest prices.

    By using Powervault’s smart tariff controller you can select a charging schedule that ensures you benefit from the most inexpensive energy and potentially reduce your bills by a further 15%. For example, you can benefit from cheaper night tariffs like Economy 7, store this energy and then use it during the day.
  • Earn money from GridFLEX: There’s increased pressure on the National Grid as the demand for energy is rising. Powervault has introduced GridFLEX where they can occasionally manage your battery in order to support the grid when it’s under stress. By using this platform you can receive £120 per year from Powervault. This is guaranteed for a period of 2 years.
Powervault 3 cut energy costs

How Much Does a Powervault 3 Battery Cost?

The Powervault 3 roughly costs between £4,700 and £14,800 depending on the capacity size. As mentioned previously, the Powervault 3 is known for being economically priced compared to its competitors. Especially considering its Depth of Discharge is 100% and the fact it comes with a 10-year warranty. This as well as all the other fantastic benefits mentioned above make it a solid investment.

And, if you’re looking for the ultimate deal, then the Powervault 3eco is even cheaper, ranging from £3,500 and £5,000 based on the capacity.

Below we’ve summarised the approximate prices for the Powervault 3 in the UK:

Powervault 3 ModelApproximate Cost

4 kWh

£4,740

8 kWh

£7,020

12 kWh

£9,420

16 kWh

£12,660

20 kWh

£14,820

If you want to increase your battery’s capacity later on then you can purchase additional battery packs for the Powervault 3.

Capacity Increase4 kWh8 kWh12 kWh16 kWh

Capacity to 8 kWh

£3,540

Capacity to 12 kWh

£7,080

£3,540

Capacity to 16 kWh

£10,620

£7,080

£3,540

Capacity to 20 kWh

£14,160

£10,620

£7,080

£3,540

These prices are just a guideline, for accurate prices tailored to your needs, we highly recommend getting quotes from solar installers in your area. Click the button below to see what the top deals are in your local area without any obligation or cost.

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Grants for the Powervault 3

If you’re still unsure about the costs of a Powervault 3, don’t worry as there are plenty of options when it comes to financial support. The UK has a few different solar panel grants that may be suitable for you.

Powervault 3 help with cost uk

The first way you can make up for the costs of your solar battery is through the Smart Export Guarantee (SEG). With this you can earn money, making back the initial investment and more over time, by exporting your stored energy to the National Grid. You need to check with your energy supplier whether they support this and how much they pay, but for reference 4-6p/kWh is considered a good rate.

On the 1st April 2022, new VAT laws were introduced in the UK. If you install your solar battery system at the same time as your solar panels, you can secure VAT at 0% on both your Powervault battery and your solar installation.

Lastly, there are specific solar energy grants for those based in Scotland. You can receive up to £6,000 when you install solar panels and £5,000 for batteries, both interest-free, through the Home Energy Scotland Loan.

If the cost of installing a Powervault 3 or another solar battery is what’s stopping you from reducing your carbon footprint and increasing the value of your home, then we recommend you research the best deals in the UK. One way you can effortlessly do this is by comparing quotes from solar installers near you. That way you can see what options are available to you before making your decision. It’s free and you’re under no obligation to accept any of the quotes you receive.

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