Solar and Re-Roof Installation Walton: £1,738 Estimated Annual Savings
Every home has different energy needs. Therefore, the best solar systems are designed around the property and the way the household uses electricity.
This Solar and Re-Roof Installation Walton project on Grantham Avenue, Walton (WA4), combines a complete re-roof with a high-performance solar and battery storage system.
Installed by NRG Solar Ltd, the system features 21 AIKO 515W solar panels, and 18.08kWh of Sigenergy battery storage.
The result is a 10.81kWp solar PV system designed to reduce electricity costs while also creating income from surplus energy exported to the grid.
The system is expected to provide approximately £1,738 in annual energy bill savings.
System Overview
This Walton project involved more than installing solar panels. The property also underwent a re-roof, allowing the roofing and renewable energy work to form part of the same overall project.
System Specifications:
- 21 × AIKO 515W solar panels
- 10.81kWp solar PV system
- 18.08kWh Sigenergy battery storage
- 2 × SigenStor BAT 10.0 batteries
- Re-roof completed alongside the solar installation
Together, these components create a powerful home energy system.
During daylight hours, the AIKO panels generate renewable electricity. The home can use this electricity immediately, while the Sigenergy batteries can store surplus power for later.
In addition, excess electricity can be exported to the grid.
Why Combine a Re-Roof with Solar Panels?
If a roof already needs replacing, completing the re-roof and solar installation together can make sense.
Firstly, the roofing work can prepare the property for its new solar system. This avoids installing panels on a roof that may require major work in the near future.
Furthermore, combining the projects can reduce disruption compared with carrying out both jobs separately.
Once complete, the homeowner benefits from a renewed roof alongside a modern solar and battery system designed for long-term use.
How This Solar and Battery System Works
The solar panels generate electricity throughout the day. Firstly, the home can use this electricity to meet its immediate energy needs.
When the system generates more electricity than the property requires, surplus energy can charge the Sigenergy batteries.
Stored electricity can then help power the home when solar generation drops.
Meanwhile, additional surplus electricity can be exported to the grid through the Smart Export Guarantee.
This installation is expected to achieve:
- 35% self-consumption
- 65% export to the grid
The high export level means the system is expected to produce significant amounts of surplus renewable electricity.
Solar generation naturally changes throughout the year.
For this installation, the strongest generation is expected between April and September.
Both May and June are expected to reach approximately 35.2kWh of generation per day. July follows with around 32.8kWh per day.
Therefore, the spring and summer months can produce substantial amounts of renewable electricity for the property.
When the home and battery do not need all of this energy, the remaining electricity can be exported to the grid.
Financial Results
The combination of solar generation, battery storage, and electricity exports creates several ways for this system to deliver financial value.
Estimated Annual Energy Bill Savings
Approximately £1,738
Estimated Payback Period
4 years and 7 months
Estimated Annual Energy Bill After Installation
Approximately -£213
A negative estimated annual energy bill means the projected financial value from the system exceeds the property’s remaining annual electricity costs under the assumptions used.
In addition, surplus electricity exported to the grid can generate payments through the Smart Export Guarantee.
Estimated Cumulative Bill Savings
The projected financial benefits continue to grow throughout the lifetime of the system.
| Year | Usage Savings | Smart Export Guarantee | Total Savings |
|---|---|---|---|
| Year 1 | £1,167 | £670 | £1,837 |
| Year 5 | £6,846 | £3,317 | £10,163 |
| Year 10 | £16,844 | £6,552 | £23,296 |
| Year 15 | £31,301 | £9,705 | £41,006 |
| Year 20 | £52,072 | £12,777 | £64,849 |
By Year 20, the projections show a combined financial benefit of approximately £64,849 from usage savings and Smart Export Guarantee payments.
Environmental Benefits
Alongside the financial benefits, this Walton solar installation also helps reduce the property’s environmental impact.
Every Year:
The system is expected to:
- Reduce approximately 2 tonnes of CO₂
- Offset the equivalent of 114% of CO₂, SOₓ and NOₓ emissions
Over the System Lifetime:
The environmental benefit is equivalent to:
- 51,925km of car travel avoided
- 334 trees planted
- 37 long-haul flights avoided
As a result, the homeowner can reduce energy costs while also lowering the environmental impact of their household electricity use.
Get a Free Solar Design and Savings Assessment
Thinking about solar panels, battery storage or combining a re-roof with solar in Walton or Warrington?
NRG Solar Ltd can design a system around your property and energy needs.
We can help you understand:
- How much electricity your roof could generate
- How much battery storage may suit your home
- Your potential annual energy savings
- Your potential electricity exports
- Whether roofing work should form part of the project
- The potential return on your investment
Rather than offering a one-size-fits-all package, we design each system around the individual home.
Contact NRG Solar Ltd today for a free solar design and savings assessment.