West Wales Solar Savings Calculator
Estimate generation, £/year saving, payback and CO₂ avoided in seconds. Built on PVGIS yield modelling for every SA and SY postcode we cover.
Tell us about your property
Modelled yield: 975 kWh/kWp/year on a south-facing 35° roof.
Modelled annual usage: 5,745 kWh at the current Ofgem cap rate of 26.11p/kWh.
Import savings (£356) + SEG export (£304)
4 kW × 975 kWh/kWp
Guide cost: ~£4,000 (inc 0% VAT) — priced per job after a full site survey
UK grid intensity 0.193 kgCO₂/kWh
No battery
- Yield: 975 kWh/kWp/year (Haverfordwest)
- Ofgem cap import rate: 26.11p/kWh (July–September 2026; resets quarterly) · typical SEG export: 12p/kWh
- Self-consumption without battery: 35%
- System cost includes 0% VAT (until March 2027)
- Final figures depend on roof orientation, shading and tariff — confirmed on-site.
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Calculator FAQs
How accurate is this calculator?
Estimates are typically within ±10% of measured first-year performance for a south-facing 35° pitch system. Final quotes are anchored to a free on-site survey.
What import and export rates does it use?
Current Ofgem cap import rate: 26.11p/kWh for July–September 2026 (the cap resets quarterly). Typical SEG export: 12p/kWh. Actual rates vary by tariff.
Does the cost include 0% VAT?
Yes — system cost figures already reflect the 0% VAT rate that runs until March 2027 on MCS-certified domestic solar PV and batteries.