Solar panel calculator
Calculate solar panel savings
We've built a solar calculator to help you work out how much money you could save on your energy bills with solar panels.
Number of panels
Size of battery
Choose from a range of sizes to find what works best for you
Adding battery storage helps maximise savings.
For households with average energy usage
For households with high energy usage
Your electricity bill
See how much you could save on electricity bills with solar panels and battery storage installed at your home.
With solar
Per year
Savings per year
Savings per year
These savings are estimates modelled on a south-facing roof and unfortunately not a guarantee. Electricity export rate of £0.15 per kWh
Without solar
Per year
Based on an average 4/5 bedroom house using 4,200 kWh a year and the October 2025 price cap rates.
How many solar panels do you need?
Answer a few quick questions about your home and BOXT's solar experts will help you determine how many solar panels you need. We can do this online - no home visit needed!
As a general guide, we recommend the following sizes based on the number of people living in your home:
- 8 panels for a 2 person household (3kW system)
- 10 panels for a 3 person household (4kW system)
- 12 panels for a 4 person household (5kW system)
- 14 panels for a 5+ person household (6kW system)
BOXT solar experts will help you work out how many solar panels you need
The number of solar panels you need depends on a number of factors, including:
- How much electricity your home uses
- The space available on your roof
- Any shading on your roof
- The angle of your roof
- Geographic orientation of your roof
- Architectural elements such as skylights and chimney
By answering a few quick questions online, we'll be able to instantly provide you with a recommendation for how many solar panels would be best for your home.
Get a solar panel quote from BOXT online
It's a quick and easy process to get a quote for your solar panels from BOXT.
Just answer some simple questions about your home and we'll recommend how many panels would be best suited to your home and the cost.
Then, you can choose how you want to pay, whether in full, in monthly installments, or Buy Now Pay Later.
Then, we'll arrange installation, including the required scaffolding and equipment, in as little as 2 weeks!
Learn more about the costs & savings of solar panels
BOXT Limited is authorised and regulated by the Financial Conduct Authority. FCA register No. 767308. Finance is offered through HomeServe Finance Limited (FRN 994955) and in some cases we also lend with Propensio Finance Limited (FRN 806409). Finance available subject to status, affordability and a credit check. Terms and conditions apply. BOXT Limited acts as a credit broker and is not a lender. Registered in England & Wales company No. 08086606 VAT No. 257059782. BOXT Limited, 3320 Century Way, Thorpe Park, Leeds, West Yorkshire, LS15 8ZB.
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