Solar PV & Battery Savings Calculator for Cardiff

In Cardiff, Wales, a 1 kWp domestic array produces an average annual yield of 987 kWh/kWp, supported by approximately 1,650 hrs regional sunshine hours and seasonal daylight patterns.

The Smart Export Guarantee (SEG) requires electricity suppliers to pay you for every kilowatt-hour of surplus clean electricity exported into the local distribution grid in Cardiff. Competitive export tariffs pay between 5p and 15p+ per kWh.

In the vast majority of cases in Cardiff, residential rooftop solar falls under Permitted Development Rights, provided panels do not protrude more than 200mm from the roof slope and the property is not a Grade I/II listed building.

Yes. While East-West arrays produce around 10% to 15% less total annual energy than ideal South-facing roofs, they generate power during early mornings and late afternoons, aligning perfectly with peak morning and evening domestic power demand.

Yes. Homeowners in Cardiff and across Wales benefit from 0% VAT (Energy-Saving Materials relief) on solar PV panels, hybrid inverters, and battery storage systems until March 2027.

Yes. With domestic electricity tariffs around 7.8p/kWh in Cardiff, direct self-consumption generates substantial savings. Because capital expenditure is lower, standalone solar systems often achieve a payback period of 6 to 8 years.