Solar Panels in Walton-on-Thames, Surrey

A 3-4kWp system in Walton-on-Thames typically costs £5,000-£8,000 with 0% VAT included — the zero-rate VAT alone saves around £1,000 compared to the standard 20% rate. The system generates approximately 3,900 kWh/year, paying for itself in 6-8 years through electricity savings and Smart Export Guarantee income of 4-6p/kWh. Adding a home battery (5-10 kWh) costs an additional £3,000-£6,000 and also benefits from 0% VAT. We recommend getting at least three quotes from MCS-certified installers to compare pricing and equipment.

Yes. A home battery (typically 5-10 kWh capacity) stores excess solar electricity generated during the day for evening and overnight use. This increases your self-consumption from around 30-40% to 60-80%, significantly reducing your reliance on grid electricity. Batteries currently cost £3,000-£6,000 and also benefit from 0% VAT on residential installations. Most batteries are warranted for 10-12 years and can be retrofitted to an existing solar system. Popular options include the Tesla Powerwall, GivEnergy, and Fox ESS units.

Most homes in Walton-on-Thames benefit from a 3-6 kWp system. A 4kWp system (10 panels at ~400W each) covers 103% of average household electricity use and requires approximately 18-20 m² of unshaded roof space. If you have an electric vehicle or heat pump, a larger 5-6 kWp system (12-15 panels) may be more appropriate to offset the additional demand. Your MCS-certified installer will assess your roof space, orientation, shading, and electricity consumption to recommend the optimal size during a site survey.

South-facing roofs at a 30-40° pitch produce the most electricity (100% of potential yield). South-east and south-west roofs produce around 95% of optimal output. East or west-facing roofs still produce 80-85%, and many installers recommend splitting panels across east and west faces to spread generation throughout the day, which can improve self-consumption. North-facing roofs are generally not recommended for solar panels in the UK as they receive significantly less direct sunlight. Your MCS-certified installer will assess your roof orientation during the site survey.

Shading from trees, chimneys, or nearby buildings can reduce output significantly — even partial shading on one panel can affect the whole string in older systems. Modern systems use power optimisers or microinverters so that shading on one panel does not drag down the performance of other panels, typically recovering 20-25% of otherwise lost generation. Your MCS-certified installer will assess shading patterns throughout the year during the site survey using specialist tools. If shading is unavoidable, optimisers add approximately £50-£80 per panel but are well worth the investment for maintaining overall system performance.

Solar panels stay with the property as a permanent fixture and transfer to the new owner upon sale. They add value to your home — up to 4% according to UK property research — and improve the EPC rating, making the property more attractive to energy-conscious buyers. Your installer can transfer monitoring app accounts and warranty documentation to the new owner. The Smart Export Guarantee registration also transfers with the property. With a 25-30 year lifespan, the next owner inherits many years of remaining electricity savings.

Yes, solar panels generate electricity all year round, including during winter months. While output is lower from November to February, Surrey still receives usable daylight hours even in December, and panels work from diffused light on cloudy days. Annual generation figures (3,900 kWh for a 4kWp system) already account for this seasonal variation. Cooler winter temperatures actually improve panel efficiency compared to hot summer days. Adding a battery allows you to store daytime generation for evening use when winter daylight hours are shorter.