Solar & Batteries

10 Solar Battery Facts UK Homeowners Should Know

Published 5 Jun 2026

What this video covers

Everything you need to know before buying a solar battery.

Solar batteries capture your daytime solar surplus for evening use. Here are ten essential facts to help you decide if a battery is right for your home. From Axiom Eco Homes.

In this video

  1. 0:00 Intro
  2. 0:12 10. 5 kWh battery costs £4,500–£7,500
  3. 0:23 9. Usable capacity is 80-90% of total
  4. 0:35 8. Lithium-ion is the most popular type
  5. 0:44 7. Payback period is 8 to 15 years
  6. 0:51 6. Batteries last 10 to 15 years
  7. 0:58 5. Cut grid use by up to 60%
  8. 1:06 4. 0% VAT on battery installations
  9. 1:13 3. Round-trip efficiency is 90-95%
  10. 1:22 2. Check MCS certification
  11. 1:30 1. Match capacity to evening demand
  12. 1:38 Where to start