Battery Storage in Ely, Cambridgeshire: Costs, Brands & Local Guide 2026

Ely is just 7 miles from our Isleham base — making it one of the locations we serve most frequently. The combination of Ely's high solar irradiance (among the best in England), a growing stock of solar panel installations, and rising electricity prices makes battery storage an increasingly compelling investment for Ely homeowners.

Battery Storage Costs in Ely

Battery storage costs in Ely are consistent with national pricing. A Fox ESS EVO 9.6kWh battery costs approximately £4,500–£5,500 installed. A Tesla Powerwall 3 (13.5 kWh) costs £8,500–£10,000 installed. All installations are 0% VAT.

For new solar installations in Ely, we typically pair solar with a Fox ESS or Tesla Powerwall battery — both offer excellent app monitoring, smart tariff integration, and 10-year warranties.

Why Ely Is Particularly Good for Battery Storage

Ely's solar irradiance of approximately 1,060–1,080 kWh/m² is above the national average and means solar systems installed locally generate more electricity per kW than in most other parts of the UK. More solar generation means more surplus electricity to store — and more opportunity to displace grid electricity at 28p/kWh.

A 9.5 kWh battery in Ely, paired with a 4 kW solar system, typically reduces grid electricity consumption by 70–85%, with additional savings from smart tariff overnight charging on Octopus Agile or Flux.

Retrofitting a Battery to Existing Solar in Ely

Many Ely homes had solar panels installed between 2010 and 2020 and are now looking to add battery storage to capture more of their generation. Whether a retrofit is straightforward depends on the existing inverter. Modern hybrid inverters from Huawei, Solis, or SolarEdge can usually accept a battery directly. Older string inverters require either replacement or an AC-coupled battery such as the Tesla Powerwall.

We carry out free battery compatibility assessments for Ely properties with existing solar, confirming the correct approach before providing a quote.