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Free Solar Calculator

How Much Could You Save with Solar?

Adjust the sliders to match your home and see real-time estimates for annual savings, payback period, CO₂ impact, and 25-year return. Then request a free personalised quote.

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Instant results
Based on real South Yorkshire data
Savings Calculator

See How Much You Could Save

Adjust the sliders — they work together to show exactly what solar means for your specific bill and home.

£150/mo
£50/mo£500/mo
Solar bill offset
0%

Adjust the sliders to see your coverage

6 kWp (~12 x 485W panels)
2 kWp (small)16 kWp (large)
Recommended: 6 kWp for your bill

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Your Estimated Savings

£0 per year
Above average savings

1,000+ installations completed by ElectriFusion

Output

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per year

Payback

0 yrs

to break even

CO2 Saved

0t

per year

Payback Progress 0%
Year 0Break-even12+ yrs
System cost (inc. installation) £0
25-year projected saving £0
VAT saved vs 20% rate £0

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Your personalised solar estimate

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Estimates based on 485W panels, 850 kWh/kWp annual generation, ~50% self-consumption (higher with a battery or EV charger), 24.5p/kWh unit rate, and 12p/kWh Smart Export Guarantee (Octopus Outgoing fixed). Generation above your home's annual usage is exported at the export rate, not taken off your bill. The 25-year figure allows for panel degradation (~0.5%/yr) at today's prices and excludes any future inverter or battery replacement. For illustration only — your survey quote will be tailored to your roof and usage.

Standard 4.85kW System

Suits a 3-bed semi. Generates around 4,300 kWh/year. Typical annual saving of £590-£830 without battery storage. Payback 8-10 years.

Solar + Battery Bundle

Adding a 5kWh battery increases self-consumption to 75-85%, raising annual savings to £900-£1,200. Ideal for households with high evening usage.

Solar + Battery + EV

Combining solar, battery, and an EV charger creates a complete energy ecosystem. EV owners can save an additional £800-£1,200/year on fuel costs.

1,000+

Installations completed

4.7/5

Trustpilot rating

0%

VAT on solar panels

15 years

Workmanship warranty

Calculator FAQs

How accurate is the solar savings calculator?
The calculator provides reliable estimates based on 900 kWh/kWp generation, South Yorkshire solar irradiance data, a 24.5p/kWh tariff rate, and Smart Export Guarantee rates of 6p/kWh. Actual savings vary based on your specific roof orientation, shading, energy usage patterns, and the energy tariff you are on. A free site survey from our MCS-certified team will give you a precise personalised figure.
What system size should I choose?
Most 2-3 bedroom homes in South Yorkshire suit a 3.5-4.5kW system (8-10 panels). A 4-bedroom home typically benefits from a 5-6kW system. The right size depends on your roof space, energy consumption, and whether you plan to add battery storage or an EV charger. Our free survey will identify the optimal system for your home.
Does battery storage really improve savings?
Yes. Without a battery, around 45-55% of your solar electricity is used directly. Adding battery storage increases this to 75-85%, meaning you import far less from the grid at full rate. For households with higher evening usage or EV owners, the payback on battery storage has improved dramatically as prices have fallen in 2025-2026.
How long is the payback period for solar panels?
For a typical South Yorkshire home, a solar-only system currently has a payback period of 8-12 years. Adding battery storage extends this slightly to 10-13 years, but the higher annual savings and 25-year lifetime of panels mean the total return is significantly better. After payback, the system generates essentially free electricity for the remaining lifetime.
Is 0% VAT still available on solar panels?
Yes. The 0% VAT rate on residential solar panel installations, battery storage, and heat pumps has been extended and remains in effect throughout 2026. This saves you approximately 20% compared to the standard 20% VAT rate, and the calculator reflects this in the VAT saving figure shown.

Related Guides

Solar Panel Costs
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Finance Options
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Fill in the form for your free solar assessment. No pressure, no pushy sales — just honest advice from MCS-certified specialists who respond within 4 hours.

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0% VAT on domestic solar & battery

UK Government scheme

15-year workmanship warranty included

Plus manufacturer guarantees

Smart Export Guarantee earnings from day 1

Sell surplus energy back

Finance available from £0 deposit

Representative 10.9% APR

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1,000+

Installations completed

0% VAT

On all solar installs

15yr

Workmanship warranty

4hr

Response guarantee

Solar Assessment

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