Solar savings. Calculated.
A real-time solar calculator for UK websites. Government grants, SEG export rates, payback periods — embedded with one shortcode.
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.
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
Premium chart mode
Leads with full calculation data
UK supplier rates
Government grant calculation
Product recommendations
Your brand, your colours
12 UK regions
Full settings control
4 premium themes
Pick a look that fits your site. One click in the admin — no code changes.
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
- 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
No license key required.
- 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
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 VersionFree tier available. Pro from €99/year.