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South London Scientific

Is plug-in solar worth it for your home?

Plug-in solar panels will be available in the UK soon, letting you generate electricity from your balcony without expensive installation fees or planning permission.

Enter your postcode and house or flat number to see how much energy you could generate, and whether it’s likely to be worth it.

How it works

We resolve your address against open address data (OpenStreetMap), ray-trace the surrounding buildings from LIDAR — Environment Agency for England and Welsh Government / NRW for Wales, with an honest clear-horizon fallback elsewhere — then ask PVGIS for an annual yield given the shading we found. We have no database — your address isn't stored.

Where do you live?

Postcode is required. House number or flat is optional — we use it to pinpoint your building for this calculation, not to store your address. Privacy.

What floor are you on?

Ground floor is 0. Higher floors clear more obstructions but also shift the solar peak season.

0 Ground

Which way does your balcony face?

Pick the compass direction the panel will point. South is typically best in the UK; east and west still produce well.

About your bill.

Roughly how much electricity do you use a year? Pick the closest band — the medium default works for most UK homes.

Your kit and your tariff.

UK rules cap plug-in kits at 800 W inverter output, so most kits sold here are around 0.8 kWp — two panels and a microinverter.

Advanced. Kit cost and self-consumption

Kit prices are falling — payback improves over time.

£0 assumes a DIY socket install. Until the plug-in safety standard lands (expected mid-2026), the compliant route is a quick hardwire by a registered electrician — add their cost here if that applies.

Defaults to 0. The Smart Export Guarantee needs an MCS-certified install, which DIY plug-in kits can't get — so most owners earn nothing for exported power, and the value is in what you use yourself. Set a rate only if you have an MCS install.

Modelling shading and yield.

Something went wrong.

Here's what we found.

Approximate · postcode-level
We don't have detailed building data for this address. This estimate assumes a clear horizon — actual yield will be lower if nearby buildings or trees shade your panel.
Net earner
Kit cost . incl. VAT
Annual generation . kWh / year
Payback . years

Plug-in panels typically last around 25 years, still generating roughly 80% of their original output by end of life — well beyond the payback period.

These are estimates to help you weigh it up — not financial advice. Real yield and savings vary with the weather, your day-to-day electricity use, and how the kit is installed.

Where the panel is

What the sun sees from your balcony

Grey is the sky blocked by nearby buildings (LIDAR-derived). Gold arcs trace the sun on midsummer, the equinox, and midwinter. Where a gold arc dips into the grey, the sun is hidden then.

  • Midsummer
  • Equinox
  • Midwinter
  • Panel faces
Generation by month
How we worked this out
Panel orientation
.
Panel tilt
.
Approximate observer height
.
Building height (LIDAR)
.
Address precision
.
System size
.
    Tariff and savings
    Tariff
    .
    Solar-weighted import rate
    .
    Annual savings
    .
    Lifetime savings (20 years, net of cost, undiscounted)
    .

    Savings come from the power you use yourself: most plug-in kits can't claim the Smart Export Guarantee (it needs an MCS install), so exported energy is assumed to earn nothing. Self-consumption defaults to 60% (spec §3.7). Time-of-use tariffs use a typical-day model. Refresh quarterly.

    Tell me when kits arrive in the UK.

    Plug-in solar is in regulatory limbo here — the kits available elsewhere in Europe aren't legally for sale in Britain yet. We're tracking the market. Leave your email and we'll let you know when things change.

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