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Three of the best batteries for solar panels

Three of the best batteries for solar panels

So you are looking for the best batteries for solar to store energy to use excess energy off grid. Lets look at some of the best in class batteries together with their best qualities along with their possible drawbacks. After all we want to ensure that we remain neutral with our analysis.

The battery list

Below is a short list of batteries that we have collated information for and consider to be some of the best batteries to use with your solar power system:

  • Tesla Powerwall 2

Chosen for its ease of installation

  • Enphase Encharge

Selected for its smart features

  • Powervault 3

Best for off grid living

Lets look at each one in detail.

Tesla Powerwall 2

Tesla is most recognized for its electric cars, and as a result, they have extensive experience in the battery industry. This expertise has been put to the test with Tesla’s Powerwall 2, a solar battery that redefines the category.

The best part about this system is the AC lithium-ion battery system; it makes installation a breeze, especially if you’re attaching it to an existing solar panel.

The Powerwall is also quite quiet, and it has the look of a future-oriented tech product from Tesla. If you want more power, you may stack multiple Powerwalls together; however, most homes will be OK with just one 13.5 kWh (kilowatts hour) unit.

Possible drawbacks

The Powerwall 2 is a great product but it is unfortunately quite expensive, coming in at around £7,450 per unit. If you want the Powerwall to function as a backup in case of a power cut, the price increases by an additional £1,480 for the Tesla Gateway.

If you’re serious about solar batteries, the Gateway is a must-have. It unlocks a lot of the smart features (including monitoring capabilities), so it’s well worth considering getting one.


  • Price: Around £7,500
  • Dimensions: 1,150mm x 755mm x 147mm
  • Weight: 114 kg
  • Capacity: 14 kWh
  • Usable capacity: 13.5 kWh
  • Depth of Discharge: 95%
  • Max power output: 5.0 kW
  • Installation: Standing or wall mounted for both indoor and outdoor
  • Warranty: 10 years or unlimited cycles

Enphase Encharge

Enphase Energy is one of the most innovative companies in solar manufacturing. They pioneered technologies such as microinverters for solar panels, meaning that the power from your solar system keeps flowing even if one or more panels stop working.

Solar batteries are also produced by the company, which has a special interest in innovative characteristics, such as the Enphase Encharge. The Encharge is an all-in-one solution for a home’s entire energy system that manages more than just solar panels.

It does so with its smart switch function, which automatically varies between solar power, grid power, battery power, and generator energy based on your requirements.

The Encharge is also compatible with power outages, thanks to automatic grid failure detection that instantly activates the battery when the electricity goes down.

Possible drawbacks

The Enphase Encharge is not as cost-effective as the Tesla Powerwall 2, but it does offer most of the same features (the basic Encharge unit has 3.5 kWh but lacks power). Fortunately, because it’s a modular battery system, the Enphase Encharge can be expanded to include additional 3.5 kWh units for more capacity.


  • Price: Around £7,500
  • Dimensions: 1,070mm x 664mm x 319mm
  • Weight: 154.7 kg
  • Capacity: 10.5 kWh
  • Usable capacity: 3.5 kWh but can be modularly expanded
  • Depth of Discharge: 95%
  • Max power output: 10.08 kW when stacked fully
  • Installation: Standing or wall mounted for both indoor and outdoor
  • Warranty: 10 years or unlimited cycles

Powervault 3

Do you want to be rid of the constraints of the power grid? Off-grid living is the solution, but you’ll need a way to supply electricity. There’s always the choice of a petrol-powered generator… but if you’re going off-grid, why not go with solar?

The Powervault 3 solar battery is the one you want if you’re looking for options. Its 20.5 kWh capacity means it can power your home even in difficult situations. Larger batteries might be available, but this one strikes the perfect balance between size and portability, making it ideal for a residential property that needs lots of power..

The Powervault 3 also has two DC inputs, allowing it to be connected directly to your solar panels. This means that if your current inverter fails, you won’t need to replace it. That’s about £1,000 in savings right there.

Possible drawbacks

With a high battery capacity comes a significant weight burden, and the Powervault 3 is no exception. The 20.5 kWh version weighs in at 330 kg, which is considerably greater than that of most other solar batteries.


  • Price: Around £4,999 (Rising up to £14,800 for the 20.5 kWh model)
  • Dimensions: 1,270mm x 1,000mm x 250mm
  • Weight: 179 kg
  • Capacity: 8.2 kWh
  • Usable capacity: 8.2 kWh
  • Depth of Discharge: 100%
  • Max power output: 5.5 kW
  • Installation: Standing indoor only
  • Warranty: 10 years or minimum of 6,000 cycles

In Summary

The Tesla Powerwall 2 may be the most expensive of the bunch but it is by far the easiest to install. For bundles of smart features look no further than the Enphase Encharge battery and for that true off-grid living, go with the Powervault 3 every time.

Still unsure what battery to choose

We take a look at another 3 batteries on the market here. Alternatively give us a call on 0800 0096625 or email us at to discuss your requirements.

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