Design XQT7W5HT2D

10 Downing Avenue, Guildford

Roof configuration & solar output

Manual roof mode selected

Roof sections and panels

Roof 1

Pitch

Normal pitch

Roof direction

South

Shading

From trees or other structures

No

Material

Concrete Tile

Number of Floors

For this side of the building

1

Estimated output

kWh per year

8,758

Number of Panels

Manually entered

20

Your 20 panel system is estimated to produce around 8,758kWh per year

Your chosen package

x20

x1

Tesla Powerwall 3

20 x panels

1 x Powerwall 3

13.5 kWh storage

The Tesla Powerwall 3 is a state-of-the-art home energy storage solution designed for homeowners seeking enhanced energy independence and efficiency. With a 13.5 kWh lithium iron phosphate (LiFePO₄) battery, it offers a 100% depth of discharge and an impressive 97.5% round-trip efficiency, ensuring maximum energy utilization. The integrated solar inverter supports up to 20 kW of DC solar input and delivers up to 11.5 kW of continuous AC power, capable of handling heavy household loads and providing seamless backup during outages . Its modular design allows for easy expansion, accommodating up to four units to meet growing energy needs. Managed through the intuitive Tesla app, homeowners can monitor and optimize their energy usage in real-time, making the Powerwall 3 a reliable and intelligent choice for modern energy management.

The LONGi LR7‑54HVB panels deliver top-tier efficiency, rugged reliability, and elegant aesthetics—all backed by a comprehensive 30‑year warranty. They’re a standout choice for architects, installers, and clients who care about performance and design.

First year savings

£1,192

£329.64/mo

Financing available

as low as

£16,687

estimated price

no VAT applicable

Energy insight and savings

Your electricity bill

£1,500 per year

10,000 kWh per year

More in morning and evening

Single Phase

Headline savings

Bill reduction

£802

+

Export

£390

=

First year savings

£1,192

Where will your solar energy go?

How we calculate self-consumption

Where possible we calculate the solar PV self-consumption using the MCS method and lookup tables described in guidance document MGD-003. Your design is beyond these guidelines. Therefore we use our own calculation to determine the solar self-consumption.

Energy bill before and after solar

Before solar

After solar

Your energy bill compared over 30 years

Financial explorer for this package

Upfront payment

Initial payment for the system

£16,687

Breakeven

The year in which the system has paid for itself

11th year

Total net benefit

Including system payments and energy bill savings over 30 years

£100,073

Cumulative savings over 30 years (including system cost + payments)

Note : these figures are indicative and approximated. More accurate figures would be provided in a full design and quote. For these calculations you have told us you are spending £1,500 on 10,000 kWh of electricity each year, your usage profile is "more in morning and evening" and your daily standing charge is 54p. This produces an equivalent unit rate of 13.03p per kWh. For simplicity we have assumed you would receive, on average, an export tariff of 15p per kWh. We have assumed a yearly increase in your energy bill of 7.2% compounded.

Additional options available for your system

As part of the survey, we can discuss extras that you might need or want beyond the standard solar installation. You can play with these extras below to see how they might affect the overall cost.