Solar Battery Calculator Scotland

Calculate the right battery size, annual savings, and payback period for your home

Quick Answer:Use our free calculator to find the right battery size for your Scottish home. Enter your daily energy usage, solar system size, and electricity tariff to get a personalised recommendation with estimated annual savings and payback period.

Scottish bungalow with rooftop solar panels and battery storage system used to calculate optimal energy savings

Your Details

Daily Energy Usage12 kWh

5 kWh30 kWh

Solar System Size4 kWp

2 kWp8 kWp

Export Rate15 p/kWh

4 p/kWh32 p/kWh

Electricity Tariff

Recommended Battery

Recommended Size

7.2 kWh

Best Match

Pylontech US5000

7.2 kWh£2,800 - £3,400

Annual Saving

£194

Payback Period

16 yrs

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How This Calculation Works

Battery Size

We recommend a battery capacity of approximately 60% of your daily energy usage. This accounts for the fact that you will consume some solar energy directly during the day, so the battery only needs to store the surplus for evening use.

Solar Generation

Scotland averages approximately 2.8 kWh per kWp per day annually. Without a battery, around 35% of solar generation is self-consumed. With a battery, self-consumption rises to approximately 85%, significantly reducing grid imports.

Tariff Optimisation

Smart tariffs like Octopus Flux and Go offer significant peak/off-peak price differences. Your battery charges from the grid during cheap off-peak periods and discharges during expensive peak times, creating additional savings beyond solar self-consumption alone.

Calculator FAQ

This calculator provides a reliable estimate based on average Scottish energy consumption patterns and current tariff rates. Actual savings depend on your specific usage patterns, roof orientation, shading, and seasonal variation. For a precise quote, request our free home energy survey.

Most 3-4 bedroom Scottish homes with a 4kWp solar system benefit from a 9.5kWh battery. The recommended size is approximately 60% of your daily energy usage, as you will not need to store all your daily consumption.

Yes, significantly. On a standard tariff, battery savings come purely from solar self-consumption. With Octopus Flux, you also benefit from peak/off-peak price arbitrage and higher export rates, potentially doubling your annual savings compared to a standard tariff.

Absolutely. Most battery systems, especially GivEnergy, allow you to reconfigure charging schedules to match any tariff. We configure your battery during installation and can remotely update settings if you switch tariffs later.

Get Your Free Solar Battery Quote

Join thousands of Scottish homeowners saving up to 70% on energy bills with solar battery storage.