Solar & Battery Installation Cardiff Local Installers & Quotes
Homes in Cardiff typically use around 15 kWh of electricity per day, and the city's sunny climate makes solar an attractive option. Production peaks in August and eases in December, but a properly sized system delivers strong returns year-round.
Solar Design Cardiff
Energy Usage
Your daily energy consumption determines the optimal solar system size for your home in Cardiff. Energy consumption patterns vary widely in Cardiff, but 15 kWh per day is a useful starting point for comparing solar system sizes and expected savings.
Future-proofing is worth considering: if you plan to add an EV, heat pump, or pool, your energy needs may grow — and sizing your solar system a little larger now can save money later.
Typical energy usage per person per day in Cardiff:
Note: Actual usage varies depending on property size, building efficiency, climate, and appliances.
Solar System Sizing
A solar system sized at approximately 3.9kW would cover your typical daily energy needs. With limited roof space, higher-efficiency panels can help you reach the 5.9kW to 7.9kW sweet spot using fewer panels.
A 5.9 kW solar array in Cardiff delivers approximately 22.3 kWh daily, with generation varying seasonally from 2.14 kWh/kW/day in December up to 4.64 kWh/kW/day in August.
Solar & Energy Savings
Calculate Heat Pump & EV Savings
Electrify your home by replacing gas heating, petrol vehicles, and other fossil fuel appliances with electric alternatives powered by clean solar energy. This delivers significant additional financial savings and substantial carbon emission reductions. Our calculator helps you compare costs and model the financial impact of switching to electric appliances and vehicles.
How Solar Reduces Your Electricity Bills
The calculations below show how your electricity bills change with solar. Your Old Bill of - per month (- annually) is calculated from your total energy consumption multiplied by the grid electricity rate. Your New Bill of - per month (- annually) accounts for solar generation, the percentage you use directly (self-consumption), remaining grid consumption, and feed-in credits for excess energy exported to the grid. This results in monthly savings of - (- annually).
Battery Storage Cardiff
Solar Battery Sizing
A 5.9 kW solar system without battery storage achieves around 45% self-sufficiency in Cardiff, with 55% still coming from the grid. Including a 10 kWh battery typically raises annual self-sufficiency to around 92%, with grid reliance dropping to 8%.
Battery economics depend on your specific tariff structure and usage patterns — the Photonik design tool can model these scenarios with your actual electricity plan.
Energy Self Sufficiency Calculator*
*Note: This calculator provides simplified battery self-sufficiency estimates. For accurate per-hour simulations that account for solar generation patterns, consumption timing, battery charging/discharging cycles, and efficiency losses across all seasons, use the full Photonik design tool.
Panel Placement Tool Cardiff
This is a simple panel placement tool that lets you quickly estimate panel count for a single roof area. Try Photonik for advanced features:
- Multiple panel groups
- Custom roof angles
- Panel orientation
- Shade loss calculations
- Panel selection (1000+ models)
- Full integration with our design tool
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Solar & Battery System Cost Cardiff
Understanding Solar & Battery System Costs
Solar prices in Cardiff have come down significantly in recent years — a 5.9 kW system now costs around £9,682, making the economics more attractive than ever. While batteries extend the payback period beyond 9.0 years, they also protect against future electricity price rises and provide backup power during outages.
Try adjusting the system size and battery sliders above to see how different configurations affect both upfront cost and long-term savings for your Cardiff home.
Solar Rebates & Incentives Cardiff
While there are currently no federal government rebates for solar panel installations in the UK, there are still financial benefits available for solar system owners.
The Smart Export Guarantee (SEG) allows you to earn money by selling excess solar electricity back to the grid. Energy suppliers with more than 150,000 customers are required to offer SEG tariffs, which pay you for the renewable electricity you export. Rates vary by supplier and are typically set competitively.
Additionally, installing solar panels can significantly reduce your electricity bills by generating your own renewable energy. The savings depend on your energy consumption patterns and system size, but many homeowners see substantial reductions in their energy costs.
Use our full design tool for detailed system design, panel placement, and professional proposals.