A realistic look at how long it takes for solar panels to pay for themselves.
Solar PV payback time is the period it takes for the savings and income from your solar panels to cover the initial installation cost. In Devon and Cornwall, payback times are generally good due to strong sunlight levels compared to much of the UK.
| System Size | Typical Payback Period | Notes |
|---|---|---|
| 3–4 kW system | 7–10 years | Good for smaller homes with lower electricity use |
| 5–6 kW system | 6–9 years | Most popular size in the region |
| 7–8 kW system | 6–8 years | Larger homes or properties with high daytime usage |
| With battery storage | 8–12 years | Longer payback but higher self-consumption |
The more electricity you use during the day (when solar panels are generating), the faster your payback will be. Homes with high daytime usage (e.g. working from home, electric vehicle charging) benefit more.
A well-designed system that matches your usage will pay back faster than an oversized or poorly designed one.
Higher electricity prices improve payback times because you save more on every unit of electricity you generate and use yourself.
Adding a battery increases self-consumption and can shorten payback slightly, but the extra cost usually extends the overall payback period.
Most well-designed solar PV systems in Devon and Cornwall now pay for themselves within 6–10 years. After the payback period, the electricity generated is effectively free for the remaining life of the system (typically 25+ years).
Payback times have improved significantly in recent years due to higher electricity prices and falling installation costs.
Use our Solar Estimator to see realistic payback times and savings for your property.