Free solar & battery calculator
Solar savings calculator — get an estimate in under a minute
Here's exactly how solar & battery savings and payback are worked out for a North East home — system sizing, generation, self-consumption, SEG income, install cost and payback. Then book a free survey to confirm the numbers for your property — no obligation.
How solar savings are worked out
The maths, in plain English
System sizing
The system is sized to match your annual electricity usage (estimated from your bill at 27p/kWh average). UK residential systems typically range 3-7 kWp. Larger homes with EVs or electric heating justify 5-7 kWp.
Annual generation
Generation = kWp × peak sun hours × aspect derate. North East England averages 1,050 peak sun hours per year for a south-facing roof. East/west-facing roofs derate to ~85%; north-facing to ~60%.
Self-consumption
Without battery: 30-40% of generation is used directly (lights, fridge, washing). 60-70% exports to grid at the SEG rate. With a 10 kWh battery: 70-80% self-consumed, 20-30% exported.
Savings calculation
Bill savings = self-consumed kWh × 27p (the price you would have paid). SEG income = exported kWh × 15p (current Octopus Outgoing Fixed rate). Total annual benefit = savings + SEG.
Install cost
Estimated from system size + battery option using current North 85 price ranges. Includes panels, inverter, scaffolding, DNO notification. Battery adds £4,800 (5 kWh) to £7,500 (10 kWh).
Payback
Simple payback = install cost ÷ total annual benefit. Doesn't account for electricity price inflation (which makes payback faster), panel degradation (~0.5%/year, makes it slightly slower), or maintenance (negligible for residential).
Want a property-specific quote? Our free survey runs the full BS EN model + 3D roof shading analysis. The estimate is typically within 5-10% of the calculator output. Book a free survey.
Our accreditations
Accredited, certified, and backed by independent standards
NICEIC Approved
D124458
Electrical contractor
Part P
Building Regs
Domestic electrical
SafeContractor
Approved
H&S accredited
ISO 9001
2015
Quality management
ISO 14001
2015
Environmental management
ISO 45001
2018
OH&S management
Established
1985
Family run for 40 years
NICEIC Approved
D124458
Electrical contractor
Part P
Building Regs
Domestic electrical
SafeContractor
Approved
H&S accredited
ISO 9001
2015
Quality management
ISO 14001
2015
Environmental management
ISO 45001
2018
OH&S management
Established
1985
Family run for 40 years
Every accreditation listed is independently verified. We carry the registration numbers — ask for any on request.
Free quote
Prefer we quote it for you?
Tell us about your property and we’ll come back with a fixed-price written quote after a free survey — usually within 48 hours. Covering the North East and all of the North East.
- NICEIC approved
- Part P registered
- Est. 1985
- 10-year guarantee
- Own electricians, no subcontracting
Want a survey to confirm these numbers?
Free site survey, 3D roof model, designed system, fixed-price quote within 5-7 working days.