Battery Storage Costs & Savings

Solar panels cut energy costs, but adding a battery boosts savings by storing excess power. Even without solar, you can save by charging at cheaper night rates and using energy during the day. Each kWh from your battery saves around 30p, reducing costs and increasing efficiency—making battery storage a smart choice.

Assumptions:

Unit Rate: £0.30/kWh

Night Rate: £0.07/kWh

Battery Usable Capacity: 15.66 kWh

Savings Breakdown with Solar:

Typical Charging: 60% from excess solar, 40% from the grid at night

Annual Savings from Using Solar Power: £1,028.86

Calculation: (15.66 kWh * 60% * £0.30/kWh) * 365

Annual Savings from Night Rate Charging: £514.43

Calculation: (15.66 kWh * 40% * (£0.30/kWh – £0.07/kWh)) * 365

Total Annual Savings with Solar: £1,543.29

Savings Breakdown without Solar:

Even if you don’t have solar panels, you can still benefit from a battery storage system by charging your battery at the lower night rate and using the stored energy during the day when rates are higher.

Annual Savings from Night Rate Charging Alone: £1,300.89

Calculation: (15.66 kWh * (£0.30/kWh – £0.07/kWh)) * 365

Total Potential Annual Savings:

With Solar: £1,543.29

Without Solar: £1,300.89

Battery Storage installations are charged 0% VAT whether installed independently, or alongside a new or existing Solar PV system.

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