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About us
Solar
Solarwatt
myenergi
- Full eco system
- zappi
- libbi
- eddi
BYD & Fronius
- BYD
- Fronius
Resources
- Real installs
- Blog
- FAQs
- Gallery

What will my solar ROI be?

Back to all insights

ROI depends on three things: how much power you use, your export rate, and your total installed cost. Here’s a simple way to think about it.

1) Bill savings

Every kilowatt-hour (kWh) you generate and use is one you don’t buy from your supplier. Government guidance this summer suggested typical families could save around £500/year with rooftop solar, actual savings depend on your usage and system size. Add a battery, and you usually keep even more of what you make. GOV.UK

2) Export income

In NI, export is paid via supplier tariffs rather than SEG. Power NI’s current export rate is 9.64p/kWh. A 4–5 kW system might export a few hundred to a couple of thousand kWh per year depending on usage and whether you add storage, that’s meaningful extra income toward payback.

3) Upfront cost and VAT

Residential installs benefit from 0% VAT on installation until 31 March 2027, cutting the capital you need to recover. Commercial projects may reduce upfront cost further with a 20% NISEP grant (self-consumption systems).

What customers typically see

With quality modules and good design, many NI homes target ~3–5 year payback (faster with high daytime use or a well-sized battery). We built a quick Solar Calculator to give you a personalised estimate based on your property and consumption, it’s a great first pass before a survey.

Bottom line: ROI is not one-size-fits-all, but with today’s VAT relief, supplier export, and smart system design, payback can be brisk and long-term returns strong.

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