Calculate VAT-free system costs, SEG potential, and battery ROI for UK homes.
Based on Ofgem 2025 Avg Consumption
Maximize SEG & Off-peak charging
Recommended Size
Checking Ofgem Cap Jan '26...
MCS Certified Estimates
See when your solar system pays for itself
Despite the UK's reputation for cloudy weather, solar PV installations have hit record highs as homeowners seek to escape the volatile Ofgem Price Cap. The SolarSys Global Engine is tailored for the UK climate, accounting for diffuse light performance and shorter winter days.
The financial case for solar in the UK is stronger than ever thanks to the 0% VAT policy on installations and the Smart Export Guarantee (SEG), which pays you for every unit of electricity you export back to the grid.
Until 2027, the UK government has removed VAT on solar panels, batteries, and installation. This instantly saves you 20% on upfront costs.
Energy suppliers like Octopus Energy and British Gas now pay up to 15p - 24p per kWh for the electricity you export to the grid.
Yes, modern panels work on daylight, not just direct sunlight. However, generation drops significantly in Dec/Jan. We recommend sizing your battery to charge from the grid at cheap overnight rates (e.g., Octopus Go) during winter to maintain savings.
In most cases, solar panels are "Permitted Development" and do not require permission, unless you live in a Listed Building or a strict Conservation Area.
MCS (Microgeneration Certification Scheme) certification is required to qualify for SEG payments. Always ensure your installer is MCS accredited.
Absolutely. With the gap between peak rates (28p) and off-peak rates (7p), a battery allows you to "load shift" charging cheaply at night and running your house on that stored power during the day.