● Free Instant Estimate
Design your
solar system
in 2 minutes.
Answer 7 quick questions. We instantly calculate your ideal system size, cost, monthly savings, and payback period — tailored for the UK.
500+
Systems Installed
£2.4M+
Customer Savings
25 yr
Panel Warranty
98%
Satisfaction Rate
Step 1 / 7
What type of property is this for?
Helps us understand your roof setup and any applicable UK schemes.
Residential
House, flat, bungalow
Commercial
Office, shop, hotel, warehouse
Agricultural
Farm buildings, rural land
Industrial
Large factory or facility
What is your average monthly electricity bill?
Used to estimate your energy consumption. The UK average household spends around £135/month.
How much roof or ground area is available?
You need approximately 8–10 sq. metres per 1 kW of solar capacity. A typical 4 kW home system needs ~28 m².
What type of solar system do you need?
Most UK homes go grid-tied or hybrid with battery storage for evening use.
Grid-Tied
Lowest cost. Exports surplus to grid via SEG. No power in outage.
Hybrid + Battery
Store daytime solar for evening use. Best self-sufficiency.
Off-Grid
Fully independent. Ideal for rural or remote properties.
Where in the UK is the property located?
Solar irradiance varies across the UK — the South West gets significantly more than Scotland.
Scotland / North
Glasgow, Edinburgh, Aberdeen (~2.5 hrs/day peak)
Midlands / Wales
Birmingham, Cardiff, Manchester (~3.0–3.3 hrs/day)
South England
London, Bristol, Cornwall (~3.5–4.0 hrs/day)
What is your electricity supply phase?
Most UK homes are single phase. Check your fuse box or ask your DNO if unsure.
Single Phase
Most UK homes — supports systems up to ~3.68 kW per inverter
Three Phase
Larger homes & commercial — supports higher capacity systems
What matters most to you?
This helps us select the right panel technology and inverter for your needs.
Best Savings
Fastest payback, maximise long-term ROI
Top Performance
Premium panels — better output in low UK light
Lowest Upfront Cost
Affordable entry, solid UK-certified quality
✅
Your Custom Solar Estimate
Tailored for the UK — here is what Watten Power recommends for you.
💰 Estimated Total System Cost
Minimum estimate
—
–
Maximum estimate
—
⚡ System Size
—
—
📉 Monthly Savings
—
—
📅 Payback Period
—
Out of 25-year panel life
🌍 CO₂ Saved (25 yrs)
—
—
📋 System Breakdown
System Type—
Panel Technology—
Inverter—
Battery Storage—
Annual Generation—
SEG Export Earnings—
Electricity Phase—
Ready for a precise quote?
Our MCS-certified engineers will survey your property and deliver a detailed, no-obligation proposal — completely free of charge.
* Estimates are indicative, based on average UK market rates and Ofgem tariff data (2024–25).
Electricity unit rate assumed at 24.5p/kWh (Ofgem price cap average). SEG rate at 15p/kWh (illustrative).
Actual costs vary by installer, roof type, location, and equipment specification.
VAT at 0% applies to residential solar installations in Great Britain.
Electricity unit rate assumed at 24.5p/kWh (Ofgem price cap average). SEG rate at 15p/kWh (illustrative).
Actual costs vary by installer, roof type, location, and equipment specification.
VAT at 0% applies to residential solar installations in Great Britain.