A home battery lets you store the solar energy you generate during the day and use it in the evening, instead of buying it back from the grid. But which battery is right for you? Here’s an honest comparison of three of the most popular systems we install — Tesla Powerwall, GivEnergy and Sunsynk — so you can see how they differ.
At a glance
| Feature | Tesla Powerwall | GivEnergy | Sunsynk |
|---|---|---|---|
| Approach | Large single unit | Modular, UK brand | Flexible hybrid systems |
| Typical usable capacity | Around 13.5 kWh | Modular, ~2.6 kWh upwards | Modular, mid-to-large |
| Backup during a power cut | Yes, strong whole-home capability | Yes, with compatible setup | Yes, via hybrid inverter |
| App & monitoring | Excellent | Very good | Good |
| Best suited to | Larger homes wanting big capacity & premium backup | Those wanting flexible, expandable UK-supported storage | Flexible hybrid solar-and-battery setups |
| Typical warranty | Around 10 years | Around 10–12 years | Around 10 years |
Specifications vary by model and change over time — we’ll confirm the exact options when we design your system.
Which battery is right for you?
There’s no single “best” battery — the right choice depends on your energy use, how much backup matters to you, your existing inverter, and how much capacity you need. The Tesla Powerwall is a great fit if you want large capacity and premium whole-home backup in one unit. GivEnergy suits those who like a flexible, expandable, UK-supported system. Sunsynk works well in flexible hybrid setups. We fit all three and will give you a straight recommendation rather than pushing one brand. For more detail on the Powerwall specifically, see our Tesla Powerwall guide.
Do you even need a battery?
A battery isn’t essential, but it dramatically increases how much of your own solar you use — typically from around 40% to as much as 80%. It’s especially worthwhile if you’re out during the day, want backup power, or have an EV. Learn more on our battery storage page.
Get expert battery advice
As accredited installers of all the leading brands across Dorset, Hampshire and Wiltshire, we’ll recommend the right battery for your home and budget. Get a free, no-obligation quote.