Domestic / Residential
11.87kWp all-black array with 18kWh Sigenergy battery storage and 3-phase hybrid inverter.
It's all in the details. Another high-performance install completed by Alliant Energy Ltd, this one in Lytham St Anne's. 25 × 475W all-black solar panels neatly integrated across the front elevation and dormers, paired with a 15kW Sigenergy 3-phase hybrid inverter and 18kWh of Sigenergy battery storage (2 × 9kWh). A powerful setup built to maximise self-consumption, cut energy bills, and future-proof the home with clean, renewable power. Clean install. Smart design. Strong output. Thinking about solar or battery storage? Get in touch for clear, honest advice — no pressure.
Like most domestic / residential operations, Lytham St Anne's Residential faced a structural exposure to wholesale electricity prices — a cost line that doubled for many UK businesses between 2021 and 2023 and shows no sign of returning to pre-crisis levels. With significant daytime load and suitable roof space, on-site generation was the obvious lever, but the project needed to stand on its own commercial merits: predictable payback, manufacturer-backed warranties, and zero operational disruption during install.
Following a structural roof survey and DNO capacity check, Alliant Energy specified a 11.87kWp array using 25 × 475W high-efficiency mono-PERC panels, paired with a Sigenergy 15kW 3-phase hybrid inverter and 18kWh (2 × 9kWh Sigenergy) of lithium iron phosphate (LFP) battery storage. The Sigenergy 15kW 3-phase platform was chosen for its export-management capability and remote firmware updates, allowing the array to be tuned over its life without site visits. Battery storage was sized to absorb mid-day generation peaks and discharge across the early evening, lifting on-site solar self-consumption from a typical 35–45% to over 70%.
The full installation completed in 3 days, scheduled around the customer's operating hours to avoid downtime. Work was carried out by Alliant Energy's directly employed MCS-registered engineers — no subcontracted labour. The system was commissioned to G99 requirements, registered with the Microgeneration Certification Scheme, and handed over with monitoring access, electrical certification, and structural sign-off documents on the day of completion.
In its first full year of operation the system is on track to save Lytham St Anne's Residential approximately £2,650 on electricity costs, with a payback term of 5.9 Years and a projected total ROI of 525%. Over the 25-year warranted life of the panels, the cumulative saving is forecast at £66,250 — a figure that improves materially if grid prices continue their long-term upward trend, and that benefits from the UK's 100% full-expensing capital allowance for qualifying solar assets.
The installation displaces roughly 2.8 Tonnes of CO₂ emissions every year compared with grid-sourced electricity. Over the system's 25-year design life that is the equivalent of removing more than Lytham St Anne's Residential's entire annual Scope 2 footprint several times over — a material data point for ESG, B-Corp and net-zero reporting frameworks.
Domestic / Residential businesses typically run daytime electrical loads — refrigeration, machinery, IT, lighting, compressors — that overlap closely with solar generation. That overlap is what drives strong economics: every unit generated and consumed on-site replaces a unit that would otherwise be bought from the grid at full commercial rates. The Lytham St Anne's Residential project demonstrates how the model scales for this kind of operation.
Alliant Energy installed a 11.87kWp solar PV system using 25 × 475W panels paired with a Sigenergy 15kW 3-phase inverter and 18kWh (2 × 9kWh Sigenergy) of battery storage. The installation took 3 days from arrival on site to commissioning.
Lytham St Anne's Residential saves approximately £2,650 per year on electricity, with projected lifetime savings of £66,250 over the system's 25-year guaranteed performance period. The payback term is 5.9 Years, delivering a total ROI of 525%.
This project was paid for directly by the customer. Under the UK's full-expensing capital allowance, the entire cost can be deducted from corporation tax in year one — improving the effective payback meaningfully for profitable companies.
The system avoids around 2.8 Tonnes of CO₂ emissions every year compared with grid-sourced electricity. Over a 25-year design life that's a material contribution toward Scope 2 reduction and any ESG or net-zero reporting commitments the business holds.
Probably — the same hardware platform (panels, hybrid inverter, optional battery) scales from roughly 10kW up to 1MW+. The deciding factors are roof area, daytime electricity use, current unit rate, and grid-connection capacity. Alliant Energy carries out a free desktop feasibility study and follow-up site survey before quoting.
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MCS certification isn't a box-ticking exercise — it qualifies your system for Smart Export Guarantee payments and government grants. Our installers are also NICEIC-approved and TrustMark-registered, and every install is fully insured.
