11kW Residential Solar Installation with 31kWh Battery & 114% Energy Offset in Bournemouth, Dorset

This residential property on Milner Road in Bournemouth, Dorset (BH4) — in the heart of one of the UK's sunniest coastal towns — had an annual electricity consumption of 9,000 kWh per year. With annual electricity bills exceeding £3,500 on a standard variable tariff and no way to benefit from the property's exceptional south-coast solar potential, the homeowner approached Sol4r Energy for a system that would do more than just reduce bills — it would eliminate them entirely.

The property's flat roof offered a generous footprint for 24 premium AIKO 460W all-black panels, all mounted on tilt racks at 20° to optimise the angle for maximum solar capture. Combined with Bournemouth's outstanding solar irradiance — among the highest in the UK — and a 31 kWh FoxESS battery bank, the system was designed to generate 114% of the household's total electricity demand, turning an energy consumer into an energy producer.

The property on Milner Road, Bournemouth — 24 AIKO 460W panels installed on tilt racks across flat roof by Sol4r Energy.

Sol4r Energy designed an 11.04 kWp system paired with 31.08 kWh of FoxESS battery storage, a FoxESS KH10 10 kW hybrid inverter, and a Sigenergy power sensor for real-time monitoring. Using SAM (System Advisor Model) performance modelling, the system was engineered to generate 10,295 kWh per year — 1,295 kWh more than the household consumes. Annual savings of £3,654 mean the system pays for itself in just 4 years and 8 months. The household's electricity bill is now negative every single month of the year — they earn from the grid rather than pay it. Net savings over 25 years are projected at £167,916.

24 × AIKO 460W Panels on Tilt Racks

Tilt Rack System — 20° Optimised Angle

FoxESS KH10 Inverter & 31kWh Battery Bank

Completed Array — Milner Road, Bournemouth

24 × AIKO 460W all-black solar panels on full tilt rack system (20° angle), FoxESS KH10 hybrid inverter (10 kW), 3 × FoxESS EP11 battery modules (31.08 kWh), Sigenergy power sensor & birds protection — all installed by Sol4r Energy's in-house team at a residential property in Bournemouth, Dorset.

Every component was selected for maximum output, reliable storage, and intelligent tariff optimisation. The FoxESS KH10 hybrid inverter provides 10 kW of capacity to handle this high-output system, while the 31 kWh battery bank ensures virtually every kilowatt-hour is captured and used at the most profitable time:

With 9,000 kWh of annual demand and 10,295 kWh of solar generation, this system produces 14% more electricity than the household consumes — a 114% energy offset. The 31 kWh FoxESS battery increases self-sufficiency from 35.1% (solar only) to 39.9% with storage, while 20,420 kWh of annual battery throughput ensures the system is working hard every single day — storing cheap off-peak electricity at 18p/kWh and discharging during peak hours when grid electricity costs 42p/kWh. The result: negative bills every single month. Bournemouth's exceptional south-coast solar yield of 938.6 kWh per installed kWp — significantly above the UK average — makes this one of Sol4r Energy's highest-performing residential installations. For homeowners in Bournemouth, Poole, Christchurch, Westbourne, Branksome, and across Dorset and the South Coast, these results demonstrate the extraordinary potential of solar on the south coast.

This system achieves something remarkable: negative electricity bills every single month of the year. The household doesn't just save on energy — it earns from the grid, all year round:

Projections assume 7% annual energy price increase. Utility savings based on switch from Standard Variable to Octopus Flux tariff. The household imports only 244 kWh from the grid per year — virtually zero. The 31 kWh battery with Flux tariff optimisation (importing at 18p overnight, exporting at up to 31p during peak 4pm–7pm) means the household runs in net credit every single month, earning money from the grid rather than paying for electricity.

With energy prices projected to rise by 7% annually, this residential solar system pays for itself in under five years — then delivers over £167,000 in net savings across the remaining system lifetime. By 2035, annual savings are projected to reach £5,735, and by 2050 the system will be saving £13,774 per year. The financial case is compelling: a 908% total return on investment and 24.6% annual rate of return — outperforming virtually any other home improvement or capital investment. With 0% VAT on domestic solar installations, the £18,490 purchase price includes no hidden costs. For homeowners across Bournemouth, Poole, Christchurch, Westbourne, Branksome, and the wider Dorset and South Coast area, residential solar with battery storage is the single most impactful financial decision for your home. Book a free property survey to find out what solar could save you.

At 3 tonnes of CO₂ eliminated per year, this installation makes a real and measurable environmental contribution. Over the system's lifetime, that's the equivalent of planting 503 trees or removing a car from the road for over 78,000 kilometres. With 114% energy offset, this household now generates more clean energy than it consumes — contributing surplus green electricity back to the national grid. Sol4r Energy installs residential solar systems across Bournemouth, Poole, Christchurch, Dorset, and nationwide.

All certifications issued on completion. Sol4r Energy is HIES-registered, NAPIT-approved, and TrustMark-endorsed — the highest level of consumer protection for solar installations in the UK. 0% VAT applies to all domestic solar installations.

Finance option available through Phoenix Financial Consultants Limited.

All finance applications are subject to status and approval by Phoenix Financial Consultants Limited. Sol4r Energy Ltd is an Introducer Appointed Representative (Financial Services Register No. 1005252) of Phoenix Financial Consultants Limited (FRN: 539195), which is authorised and regulated by the Financial Conduct Authority. Phoenix Financial Consultants Limited is a credit broker, not a lender.