Adam shares the real figures behind his household's move to an all-electric setup built around Sunsynk solar and battery storage, two EVs and a heat pump.
Property
Residential retrofit: Shropshire home with solar, battery storage, two EVs and a Daikin heat pump
Location
Shropshire, West Midlands, UK
Overview
Adam has documented his household's move away from mains gas, sharing the real figures behind the switch to an all-electric setup built around solar, battery storage and a heat pump.
Installation partner
Installer details were not provided. Adam, the homeowner, has confirmed that he is happy to be featured in this case study.
The challenge
The property runs two EVs covering around 22,000 miles a year and a Daikin heat pump, on top of typical household use. Adam wanted a system that could handle that significant electrical demand, reduce reliance on expensive peak-rate electricity and adapt as his energy needs changed.
The solution
The setup centres on a 7kW Sunsynk ECCO hybrid inverter and 21.28kWh of Sunsynk W Series battery storage, paired with a 6.37kWp, 14-panel AIKO Energy solar array. Sunsynk's flexibility across battery storage, backup, smart loads and solar hot water was a key reason for the choice, and battery capacity was expanded after the heat pump was installed. Much of the saving comes from switching from Octopus Go to Octopus Intelligent Go EV Saver. The batteries charge overnight during the cheaper off-peak period, typically between 11:30pm and 5am. When Octopus offers additional EV charging slots, Adam uses a mobile app to decide whether to top up the home battery during those windows or leave it as it is.
Measured outcomes
Reported energy-cost saving
Approximately 58%
Adam reports bills averaging around £42 a month as of March 2026. For six months of 2025, he had no net energy bill, with reduced bills in the remaining months.
January year-on-year bill comparison
£315.59 to £129.64
In January 2025, while still connected to gas, electricity cost £216.95 and gas cost £98.64. After the heat pump installation and full disconnection from gas, January 2026's electricity bill was £129.64 after a £3.04 export credit, even though electricity use rose by around 12%, from 1,396.41kWh to 1,564.94kWh.
Two-EV annual consumption
6,636kWh
The two EVs covered around 22,000 miles during 2025.
Heat-pump annual consumption
2,457kWh
Recorded across 2025 following installation of the Daikin heat pump in January.
Grid electricity imported
11,147.86kWh
The household imported 11,147.86kWh during 2025 at a total cost of £1,129.89.
Electricity exported
4,164kWh
Exports recorded from 22 February onwards earned £624.66.
Net grid cost for 2025
£505.23
The net annual grid cost was £505.23, equivalent to an average of £42.10 a month.
System specification
Sunsynk ECCO hybrid inverter
Adam chose Sunsynk after using a different inverter brand at a former property. He was already familiar with Sunsynk through his background teaching in the electrical industry, through eFIXX and through friends' recommendations.
Inverter: 7kW
Sunsynk W Series battery storage
Battery capacity was expanded after the heat pump was added. The source material does not consistently confirm the number of battery units, so only the confirmed total capacity is stated.
Battery: 21.28kWh
AIKO Energy solar array
14 solar panels providing a total array capacity of 6.37kWp.
Standards and compliance
No certification or warranty claims were provided. Performance, consumption and cost figures are homeowner-reported and current to March 2026.
I wouldn't hesitate – go for it sooner rather than later. The savings are there from day one. For six months last year I had no energy bill, and for the other six months I had a reduced energy bill. It can be done.
