Case Study · Residential Solar
Solar Panel Installation in Epsom, Surrey
9.025 kWpSystem Size
8 kWInverter
12 kWhBattery
7,166 kWhAnnual Output
74%Grid Independence
5Y 4MPayback
What Our Customer Said
★★★★★
We recently engaged Sol4r Energy to install a SigEnergy system with Aiko panels, and the experience was exceptional. From the initial consultation onward, the team demonstrated a high level of expertise and commitment to delivering a well-managed installation. They provided thorough explanations of the system's features and performance insights, ensuring we understood exactly what to expect. All required certifications were issued promptly. A particularly complex cable run was completed to an excellent standard, showcasing both skill and care in their workmanship.
The Challenge: A Complex Multi-Aspect Roof in Epsom
When a homeowner in Epsom, Surrey approached Sol4r Energy about installing solar panels, the property presented a unique challenge: a roof spread across three different orientations. A standard, off-the-shelf solar panel installation would have underperformed badly — only a bespoke, engineered approach would maximise generation across every roof face.
The client's objectives were clear: dramatically cut electricity bills, reduce reliance on the grid, future-proof the home with battery storage and EV charging, and lower their carbon footprint — all with an MCS-certified installer they could trust.
Before & After: The Transformation
❌ Before Sol4r Energy
- 100% reliant on the grid
- High annual electricity bills
- No battery backup or storage
- No EV charging capability
- High carbon footprint from energy use
- Vulnerable to rising energy prices
✅ After Sol4r Energy
- 74% grid independent with solar + battery
- Dramatically reduced electricity bills
- 12 kWh Sigenergy battery storage installed
- 7 kW solar-integrated EV charger fitted
- 2 tonnes of CO₂ saved every year
- Earning money back via Smart Export Guarantee
Solar Panel Installation Photos – Epsom, Surrey
Sigenergy 7 kW EV Charger
Sigenergy Inverter & Battery Stack
Sigen HomeMax Gateway
19 × AIKO 475W panels across three roof orientations, Sigenergy inverter + battery stack, 7 kW EV charger, and Sigen HomeMax gateway — all installed by Sol4r Energy's in-house team in Epsom, Surrey.
Project Overview
| Detail | Information |
|---|---|
| Location | Epsom, Surrey, KT19 — South-East England |
| Property type | 3-bedroom detached house |
| Installation date | 2025 |
| Roof type | Multi-aspect — 3 separate orientations (optimised per face) |
| Annual consumption | 5,500 kWh |
| Tariff recommendation | Octopus Intelligent — off-peak night rate £0.07/kWh (11pm–5am) |
| MCS certified | Yes — all systems included, certificates issued on completion |
Survey, Design & System Modelling
Sol4r Energy's in-home property survey team visited the Epsom property and used System Advisor Model (SAM 2020) software to model the exact output from each roof face — taking into account local shading, orientation, and tilt. This is the same modelling approach used in commercial-scale solar projects, applied to a residential installation in Surrey.
| Panel Group | Panels | Azimuth | Tilt |
|---|---|---|---|
| Group 1 — Main south-facing roof | 13 panels | 217° from North | 44° |
| Group 2 — East-facing roof section | 3 panels | 121° from North | 45° |
| Group 3 — North-east facing section | 3 panels | 36° from North | 48° |
By splitting the array across three orientations rather than forcing all panels onto one face, the system generates power across a much longer window each day — maximising self-consumption and reducing grid dependency throughout morning, afternoon, and evening.
Technical Specifications
Every component in this solar panel installation in Epsom was selected for performance, longevity, and compatibility — forming a fully integrated smart energy system:
| Component | Product | Specification |
|---|---|---|
| Solar Panels | 19 × AIKO 475W Neostar | 475W N-type TOPCon ABC technology · 9.025 kWp total · 25yr product / 30yr performance warranty |
| Hybrid Inverter | Sigenergy SigenStor EC 8.0SP | 8 kW single-phase hybrid · IP66 rated · on & off-grid capable · 10yr warranty |
| Battery Storage | Sigenergy Sigenstor 12 kWh | 12 kWh usable storage · intelligent charge/discharge · 10yr warranty |
| EV Charger | Sigen EV AC Charger 7 kW | Solar boost / time-based / load balancing modes · charges from solar first |
| Energy Gateway | Sigen HomeMax SP | Included in battery stack · whole-home backup · 0ms switchover time |
| Smart Metering | Sigen Power Sensor SP-DH | 1% measurement accuracy · 100ms data refresh · full app monitoring |
| Bird Protection | Full perimeter mesh | Installed across all roof sections |
Energy Performance & Grid Independence
| Performance Metric | Result |
|---|---|
| Total installed capacity | 9.025 kWp |
| Annual solar generation | 7,166 kWh |
| Annual household consumption | 5,500 kWh |
| Grid independence — solar + battery combined | 74% |
| Grid independence — solar generation alone | 35.87% |
| Annual consumption offset | 130% — system produces more electricity than the home uses |
| System shade factor | 0.967 — minimal shading losses across all orientations |
The system generates 30% more electricity than the home consumes annually. Combined with the Sigenergy battery storage, the homeowner achieves 74% grid independence — meaning nearly three-quarters of their electricity now comes from their own roof. Surplus generation is exported to the grid via the Smart Export Guarantee (SEG), earning income at £0.15/kWh on the Octopus Intelligent tariff. Overnight charging costs just £0.07/kWh, making the battery economics even more compelling.
Monthly Savings Breakdown — Year 1
From April through September, this Epsom solar system generates enough electricity that the household bill goes negative — the client is paid by the grid, not the other way around:
| Month | Solar Generated | Bill Before | Bill After | Monthly Saving |
|---|---|---|---|---|
| January | 198 kWh | £219 | £106 | £113 |
| February | 287 kWh | £214 | £81 | £132 |
| March | 503 kWh | £212 | £35 | £178 |
| April | 787 kWh | £183 | −£30 | £213 ✦ |
| May | 995 kWh | £165 | −£69 | £234 ✦ |
| June | 921 kWh | £157 | −£62 | £219 ✦ |
| July | 988 kWh | £153 | −£74 | £227 ✦ |
| August | 921 kWh | £150 | −£64 | £214 ✦ |
| September | 671 kWh | £163 | −£21 | £184 ✦ |
| October | 475 kWh | £181 | £26 | £155 |
| November | 270 kWh | £204 | £79 | £125 |
| December | 152 kWh | £218 | £117 | £101 |
| ANNUAL TOTAL | 7,166 kWh | £2,219 | £124 | £2,095 saved |
✦ Negative bill = earning from Smart Export Guarantee at £0.15/kWh. Projections assume Octopus Intelligent tariff and 7% annual energy price increase.
Financial Returns
£2,095Year 1 Bill Savings
5Y 4MPayback Period
£112,810Lifetime Bill Savings
£100,210Net 25-Year Savings
795%Total ROI
21.8%Annual Rate of Return
With energy prices projected to rise by 7% annually, this solar panel system in Epsom pays for itself in just over five years and delivers long-term energy security. Very few home improvements offer a comparable financial return — solar PV with battery storage consistently outperforms loft insulation, new kitchens, and even extensions in terms of measurable ROI.
Environmental Impact
2 tonnesCO₂ saved per year
350 treesEquivalent over lifetime
54,501 kmCar distance avoided
39 flightsLong-haul avoided
The AIKO 475W panels used in this Epsom installation use next-generation N-type TOPCon ABC (Amorphous Silicon Back Contact) cell technology — one of the most efficient residential solar panel technologies available in the UK today, with significantly better low-light performance than standard mono PERC panels.
Why This Epsom Homeowner Chose Sol4r Energy
🏆 MCS-Certified, Award-Winning
UK Enterprise Award winner and MCS-certified (registration NAP-68781) — the certifications needed to access the Smart Export Guarantee and all manufacturer warranties.
🔬 Professional SAM Modelling
We used industry-standard SAM software to model all three roof orientations before a single panel was ordered — ensuring this Epsom solar system was optimised for maximum annual yield, not just ease of installation.
📋 Fully Managed End-to-End
From free survey to DNO application, scaffolding, MCS commissioning certificate, SEG tariff setup, and aftercare — Sol4r Energy's in-house Surrey team handles everything.
Certifications & Warranties Included
MCS Commissioning Certificate (NAP-68781)
30-Year AIKO Panel Product Warranty
HIES Consumer Protection Warranty
30-Year Linear Performance Warranty
NAPIT Building Regulation Certificate
10-Year Sigenergy Inverter Warranty
Electrical Safety Certificate (EICR)
10-Year Sigenergy Battery Warranty
2-Year Workmanship Warranty
2-Year System Maintenance Included
All certifications are issued on completion. Sol4r Energy is HIES-registered, NAPIT-approved, and TSI-accredited — meaning you're protected under the UK's highest consumer protection frameworks for solar installations.
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