S
COGSmith Solar UK

Solar savings. Calculated.

A real-time solar calculator for UK websites. Government grants, SEG export rates, payback periods — embedded with one shortcode.

Calculator
Cogsmith Solar UK chart mode calculator with bar chart, stat tiles, and product recommendations

Read the full walkthrough →


See it on a real site

This is a demo solar installer homepage with the compact calculator widget embedded in the sidebar. Your brand, your colours, your products.

Demo site with calculator
Demo solar installer website with Cogsmith Solar UK compact calculator showing annual savings of £1,300

The problem

UK homeowners want to know how much solar will save them. They search "solar panels UK" and land on your site. If you can't show them a number — their number, based on their house, their supplier, their region — they leave.

Generic "save up to 50%" claims don't convert. A calculator that shows £1,300 per year with Octopus Energy in South East England on a south-facing roof does.

Cogsmith Solar UK gives your visitors that number in seconds, then captures their details so you can follow up.

And when they're ready to talk, you need their details — not just a name, but what they calculated. Cogsmith Solar UK captures the full calculation with every lead so you can call back with a quote ready.

What it does

Real-time calculator

Panel count, monthly bill, supplier, region, orientation, house type, battery toggle. Every input updates the results instantly — annual savings, payback period, government grant, carbon offset, 25-year profit. Chart mode with 4 premium themes for visual reporting.
Calculator with panel slider, bill input, supplier dropdown, and 9-tile results grid in pounds

Premium chart mode

4 premium themes (Aurum, Verdant, Lagoon, Solstice). Interactive bar, line, and pie charts. 25-year profit projection with break-even marker. Dark and light modes. MCS certification and BUS grant data visualised in £. Embed with [cogsmith-solar mode="chart"].
Chart mode calculator with Aurum theme showing bar chart and stat tiles in pounds

Leads with full calculation data

Your visitor sees their savings, hits Get My Quote, and you get their name, phone, and email — plus the full calculation: panels, region, supplier, savings, system cost. Call them back with a quote ready. No back-and-forth.
Lead form with name, email, phone fields and Get My Quote button

UK supplier rates

Six UK suppliers with real import and SEG export rates. Manage them from the admin or let Pro update them automatically each week.
Energy pricing admin showing Octopus, British Gas, EDF, OVO, E.ON, Scottish Power

Government grant calculation

BUS (Boiler Upgrade Scheme) grant built in — £7,500 flat rate. Configurable from the admin if the grant changes. Visitors see the grant and the net cost after grant in the same view.
Results panel showing £7,500 grant alongside annual savings and system cost

Product recommendations

Define your product bundles with prices, specs, and panel thresholds. The calculator recommends the right package based on how many panels the visitor selects.
Four product cards with UK pricing in pounds

Your brand, your colours

Three colour pickers, a logo upload, and a font selector. The calculator inherits your brand via CSS custom properties — no code changes needed.
Calculator inputs panel with branded colours and logo

12 UK regions

From South East England to Northern Scotland — 12 regions with accurate sun hour data. Each calculation adjusts for the visitor's actual location, not a UK-wide average.
Region dropdown showing South East England, London, Yorkshire, Scotland

Full settings control

Installation costs, government grant values, panel wattage, carbon factor, self-consumption rates, calculator defaults — every number is configurable from the admin.
Settings page showing costs, grants, constants, defaults, and appearance options in pounds

4 premium themes

Pick a look that fits your site. One click in the admin — no code changes.

Aurum theme — dark with amber accents
AurumDark · amber · chart-led
Verdant theme — light with emerald accents
VerdantLight · emerald · stat-led
Lagoon theme — dark with teal accents
LagoonDark · teal · compact
Solstice theme — dark with expressive hero
SolsticeDark · amber · expressive

Free vs Pro

Feature Free Pro
Real-time calculator
Panel slider, region, orientation, house type
Battery toggle
Government grant calculation
9-tile results grid
Colour theming & logo
Full & compact shortcode modes
Chart mode (4 themes) ✓ (with watermark)
Real supplier rates ✓ (read-only) Editable + auto-update
Product recommendations Editable + unlimited
Lead capture 3/month Unlimited
Leads admin & CSV export
Email alerts with lead data
Analytics (calculations & leads)
Email support

Pricing

Free
£0 forever
  • Full calculator with all inputs
  • Real supplier rates (read-only)
  • Lead capture (3/month)
  • Chart mode with watermark
  • BUS grant calculation
  • Product recommendations
  • Colour theming
Download Free Version

No license key required.

Recommended Pro
€99 /year
  • Everything in Free, plus:
  • Real UK supplier rates
  • Weekly auto-updated rates — we monitor suppliers so you don't have to
  • Full product catalogue
  • Lead capture with full calculation data & CSV export
  • Email support
Pro — coming soon

Free tier available forever.

Approx. £85/year at current exchange rates.

By purchasing, your email is added to our customer list. We'll notify you of new versions and occasionally about new Cogsmith plugins. Unsubscribe any time.

One lead covers the cost. The average solar installation is worth £5,000+ to the installer. One extra conversion and this plugin has paid for itself.

Questions

How do I add the calculator to my site?

Install the plugin, activate it, and add [cogsmith-solar] to any page or post. For a sidebar version, use [cogsmith-solar mode="compact"].

Are the supplier rates accurate?

Pro subscribers get real UK supplier rates including SEG export tariffs that update automatically each week from our data feed. Free mode uses sample rates for demonstration purposes.

Can I customise the colours?

Yes. The settings page includes colour pickers for primary, secondary, and accent colours, plus a font family selector. The calculator inherits your choices via CSS custom properties.

How does the grant calculation work?

It defaults to the BUS (Boiler Upgrade Scheme) grant of £7,500. You can adjust the grant amount and cap in the admin if the scheme changes or if your customers qualify for different grants like ECO4.

What data is stored when a lead submits the form?

Name, email, phone, consent status, plus all calculation parameters — panels, region, supplier, orientation, house type, battery, annual savings, payback, system cost, grant, and kWh produced. Everything you need to quote without calling back to ask.

Does it work with any WordPress theme?

Yes. The calculator is self-contained with scoped CSS. It renders inside a shortcode block and doesn't interfere with your theme styles. Tested with Twenty Twenty-Four, Astra, GeneratePress, and Flavor.

Ready to convert solar visitors into leads?

Download Free Version

Free tier available. Pro from €99/year.

Read the full walkthrough →