Plug-In Solar vs Rooftop Solar UK: Which Should You Actually Buy?

Two products, both called "solar," solving different problems. One is a £600-£1,000 appliance you plug into a wall socket and unplug if you move house. The other is a £5,000-£8,000+ fixture bolted to your roof by a certified installer for the next 25 years. Since SI 2026/848 took effect on 27 August 2026, the UK legally recognises both routes — but they aren't competing for the same buyer, and picking the wrong one wastes either money or patience.

Here's the 30-second version. If you rent, live in a flat, want your money back inside a few years, or just want to try solar without scaffolding and a five-figure invoice, plug-in solar is the obvious starting point — provided you buy a kit that's actually "Compliant" on the ENA G98 Type Test Register, which as of late August 2026 means UKSOL or Perlight and nobody else. If you own your home, have a decent south-facing roof, and want to meaningfully cut a large electricity bill over 15-25 years, rooftop solar is still the only route that gets you there. Some households will end up doing both, in that order.

Cost comparison: plug-in solar vs rooftop solar

The gap here is the single biggest reason most people won't be choosing between these two products — they'll be choosing whether they can afford either at all right now, and for a large chunk of renters and flat-dwellers, rooftop solar was never on the table to begin with. Plug-in solar changes that by putting a real, if much smaller, solar system within reach of a weekend's pocket money rather than a remortgage.

For anyone shopping the plug-in end of that table right now, the only lawful kits are UKSOL's range and the Perlight PowerPlug MAX 465 — our best plug-in solar kits UK 2026 guide breaks down the full lineup, but the Argos-listed UKSOL hybrid mount bundles are a reasonable start: the UKSOL Pro Max 1260W on Amazon · on eBay at around £989, the UKSOL Pro Plus 1030W on Amazon · on eBay at roughly £899, and the smaller UKSOL Pro Compact 460W on Amazon · on eBay for under £850, all clipped to the same 800W AC ceiling regardless of panel wattage. Rooftop solar has no equivalent entry price — the smallest sensible domestic installs still run into four figures before a battery is even added.

Plug-in prices in this comparison are the ones currently on retailer shelves; the live price ledger at 800wsolar.co.uk tracks them kit by kit if you want to check a figure before you buy.

Drawbacks of plug-in solar

Plug-in solar is genuinely new and genuinely limited, and it's worth being blunt about where it falls short before you buy one.

• 800W hard cap. The microinverter clips output at 800W AC no matter how much DC panel wattage you connect above that (the DC cap is 2,000W). A bigger panel array won't give proportionally more electricity — the extra capacity mostly buys more generation hours at the edges of the day, not a higher peak.
• Only two manufacturers are lawful today. Per the ENA G98 Type Test Register as it stood 26-28 August 2026, just eight kits across UKSOL and Perlight are marked "Compliant." Bigger names — EcoFlow, Anker, TSUNESS, FoxESS, Octopus Energy, Segen, Modular Solar — are all still "Non-compliant," meaning untested or unfinished paperwork, not failed testing. It is not lawful to plug one of those in yet. Check the current list via our ENA G98 register tracker before you buy anything.
• Effectively one device per household. The rule is built around a single plug-in unit per property connected to a single RCD/RCBO-protected socket, not a farm of panels daisy-chained around the garden.
• No batteries. Under this legal route, battery storage isn't permitted — you either use the power as it's generated or it's exported for free.
• Renters still need permission. Legalising the hardware doesn't override a tenancy agreement, a leasehold's rules on alterations, or a landlord's say over what's plugged into their property. "No electrician required" isn't "no permission required."
• Site restrictions apply, and no extension leads. You need a compliant socket in the right place with anti-islanding protection, and must register the system and tell your electricity network operator within 28 days — skip that and you're outside the legal framework even with compliant hardware.

Our dedicated pieces on plug-in solar panels in the UK and the legal rules for 2026 go through the compliance checklist in more depth if you want the full picture before ordering.

Drawbacks of rooftop solar

Rooftop solar isn't going anywhere and remains the better long-term investment for the right household, but it comes with real friction that plug-in solar was specifically designed to avoid.

• Big upfront cost. A typical residential system runs roughly £5,000-£8,000 or more once installation, scaffolding, and inverter equipment are included — money most households have to find in one go or finance.
• A professional install is mandatory. Unlike plug-in solar, there's no DIY route. You need an MCS-certified installer, and beyond the smallest systems, that installer typically has to submit a G99 application to your Distribution Network Operator before connection — heavier than the 28-day notification plug-in solar requires.
• Roof condition, ownership, and orientation all matter. An ageing roof may need work first, a north-facing or heavily shaded roof will underperform, and if you don't own the freehold — or you're in a leasehold flat, conservation area, or listed building — consent may be hard to get.
• Long lead times. Between surveys, scaffolding bookings, and installer availability, it's common to wait weeks or months from signing to switch-on, versus an afternoon for a plug-in kit.
• Fixed to the property. Once it's on your roof, it stays there if you sell up — it's your buyer's asset after that, not yours.

Head-to-head: output, savings, payback, effort, portability

Put the two side by side on the metrics that actually decide a purchase, and the picture is less "which is better" and more "which is better for you."

Output. Plug-in solar is hard-capped at 800W AC — a genuinely useful contribution to daytime baseload appliances like a fridge-freezer or a router, but nowhere near enough to run a home. Rooftop systems at 3-4kW+ generate several times more electricity and can meaningfully offset a household's entire daytime consumption, especially paired with a battery.

Savings. Plug-in solar's realistic saving sits in the roughly £70-£110/year range — gov.uk's own figure is "up to" £110/year, around 20% of an average home's electricity use, while independent reporting from outlets like the BBC sits closer to the lower end. Rooftop solar saves more per year in absolute pounds because the system is so much bigger, but that's measured against a far larger investment.

Payback period. Plug-in solar wins decisively here. At £599-£989 for a compliant kit and £70-£110/year saved, payback lands somewhere in the five-to-nine-year range on the pricier kits, faster on the cheaper ones. Our running costs and savings breakdown works through the sums kit-by-kit. Rooftop solar's payback is typically longer in raw years — often a decade or more — because the outlay is so much larger, even though the annual saving in pounds is bigger.

Installation effort. Plug-in solar is designed for the homeowner to install in an afternoon: mount the panel, run the cable, plug the microinverter into an RCD/RCBO-protected socket, register online. Rooftop solar needs a survey, a certified installer, scaffolding, and a DNO application — weeks, not hours.

Portability. The most underrated difference. A plug-in solar kit is legally and practically an appliance, not a fixture — like a dishwasher, it's yours to unplug and take when you move. Rooftop solar is permanent and stays with the property when you sell. For renters, frequent movers, or anyone reluctant to commit capital to a house they might leave, that portability is arguably plug-in solar's single biggest advantage — independent of price.

Who should buy which

Choose plug-in solar if: you rent or live in a flat and can get landlord/freeholder sign-off; you want a fast, low-risk way to shave a modest amount off your electricity bill; you expect to move within a few years and want the system to come with you; or you simply want to try solar without a five-figure commitment. A compact kit like the UKSOL Pro Duo 890W on Amazon · on eBay is a sensible starting point for a household without much roof or balcony space, while the larger Pro Max and Pro Plus units suit gardens where you can fit more panel area — even though output stays capped at 800W AC. Read our plug-in solar kit comparison before choosing a model, and double-check compliance status first.

Choose rooftop solar if: you own your home and plan to stay a decade or more; you have a good, largely unshaded south-, east-, or west-facing roof; you want to meaningfully reduce a large bill rather than shave a modest percentage off it; and you have the budget, or financing, for a £5,000-£8,000+ installation. Homeowners who also want battery storage or to export at scale are firmly in rooftop territory, since plug-in solar's legal framework excludes batteries entirely.

Some households genuinely want both, in sequence. A renter who buys a plug-in kit today, sees a modest saving, and later buys a house with a good roof is a coherent path — the kit moves with them, and rooftop solar becomes the next step once they own a suitable property. There's no rule against owning both at once, though adding a plug-in kit to a house that already has rooftop solar is marginal at best.

If the answer for you is plug-in, the 800wsolar ledger is the shortest route to what is actually certified and in stock today; if it is rooftop, an MCS-certified installer quote is the next step instead.