Tesskat EV Hub

UK Solar + Battery Calculator

Estimate installed cost, annual savings, battery size, payback time, and extra benefits if you charge your EV on solar.

Your home energy assumptions

Use practical UK defaults, then tailor the result to your roof, tariff, and EV usage.

Annual electricity use (kWh/year)

Panel rating (W)

Solar yield band

Roof / shading factor

Target solar coverage

Battery module size (kWh usable)

Quick cost preset (UK)

Electricity import price (p/kWh)

Export tariff (p/kWh)

Solar installed cost (£ per kWp)

Battery installed cost (£ per kWh usable)

Fixed costs (£) (scaffold / paperwork / extras)

Include battery (BESS)

I have an EV (calculate extra savings from charging on solar)

Planning estimates only. Real designs depend on roof area/orientation, inverter limits, and DNO/export constraints.

Your estimate

Suggested solar size

3 kWp

Panels required

Estimated annual generation

2,560 kWh/year

Solar self-use

1,792 kWh/year

Solar export

768 kWh/year

Estimated roof area (panels only): 13.3 m²

Allow ~15.3 m² with spacing/clearance.

This system could supply about 80% of your home's annual electricity use.

Grid independence potential: ~56%.

UK home comparison: Small home / 1–2-bed

Typical range: ~2–3 kWp (limited roof or lower usage).

SmallTypicalLarge

Self-used (per year): 1,792 kWh/year

Exported (per year): 768 kWh/year

Bill savings (per year): £496

Export income (per year): £31

Total benefit (per year): £528

CO₂ avoided: 494 kg/year

Estimated 25-year benefit: £13,192

Lifetime figure is a simple multiple (no inflation/discounting).

Estimated installed cost: £7,323

Solar cost: £3,773

Battery cost: £2,750

Fixed cost: £800

Payback time: 13.9 years

Suggested battery (usable): ~4.9 kWh

Module recommendation: ~1 module(s) of 5 kWh

Battery used for cost estimate: 5.0 kWh

All results are per year. Estimates only.

Continue in Tesskat EV Hub

Turn home energy planning into the next decision

This tool should support EV drivers, homeowners, charging buyers, and B2B conversations around broader energy and charging solutions.

Charging route

Check charging time and home charging setup

Once home energy savings look strong, move into charge-time planning to estimate session time, charger speed effect, and day-to-day charging practicality.

Open charge-time calculator

EV ownership route

See how energy affects annual EV cost

Continue into EV cost comparison to connect solar generation, electricity pricing, and charging behaviour with broader annual EV ownership savings.

Open EV cost calculator

Customer or B2B route

Move into products or project support

Use the solar and battery estimate as the start of a real next step, whether that means EV charging products, installer conversations, home energy support, or a direct Tesskat EV business enquiry.

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Upgrade path

Free now. Deeper planning later.

Keep the live solar and battery estimate open to everyone, while preparing a stronger Pro and Business layer for saved reports, deeper comparison, and commercial support.

Free now

Live estimate and shared context

Use the Solar + Battery Calculator freely with live generation, savings, battery sizing, payback outputs, and shared Hub assumptions.

Pro soon

Save and compare home energy scenarios

Add saved comparisons, tariff scenarios, battery-size comparisons, downloadable summaries, and stronger recommendations for households.

Business soon

Installer, partner, and project support

Build toward proposal-ready outputs, multi-case planning, and support for installers, partners, and broader home energy projects.