Short answer: you have not bought contraband, and nobody is going to take it off you. What being off the list costs you is narrower than that — and once you know what it actually is, the decision gets much easier.
Plenty of sellers now use "certified" as a scare word. If you have already bought a kit, or you are looking at one that is cheaper than the rest, you deserve a straight answer rather than a sales pitch. Here it is.
First, "certified" is the wrong word
There is no certification mark for plug-in solar. Nobody hands out a badge. What actually exists is:
- Lab testing — an independent laboratory checks that the device behaves safely when it is feeding electricity back into the network, above all that it shuts off the instant the power goes out. Those safety rules are called G98.
- A public list — the companies that own the cables in your street publish, through their trade body, every device that has been through that testing. It is called the Connect Direct register.
So the honest question is never "is it certified?" It is "has this device been tested, and is it on the list?" Anyone selling you a "certification" is using a word the regulations do not.
There is a third thing on the register worth understanding, because it is easy to read as a verdict. Each device carries a status, assessed by ENA appointed evaluators. In ENA's own words, "Compliant" means the device "has been deemed acceptable for use by Distribution network operators"; "Non-compliant" means ENA's engineers assessed it as non-compliant and that network operators are "unlikely to accept this equipment on their networks".
Note what that is not. It is not a failed test — every device on the register, whatever its status, shows a completed full G98 type test, and the status is a separate human assessment sitting on top of it. And it is not a statement that a product is illegal. It is a statement about how network operators are likely to respond. We report ENA's assessment as theirs, with the date we read it, and we do not turn it into a verdict of our own.
What the register actually decides
It decides one specific thing: whether the device can lawfully be connected by being plugged into an ordinary socket.
That is it. It does not decide whether the panels are any good, whether the company is reputable, or whether the equipment is safe to own. It governs one connection method.
The reason that method is governed at all is worth knowing, because it is not paperwork for its own sake. If the power goes out, your device has to stop feeding electricity into the network immediately. Otherwise it can keep a cable live while an engineer working on it believes it is dead. That is what the lab test is checking, and it is why the rule exists. (The engineers' word for the shut-off behaviour is anti-islanding.)
Your three real options
Not two. And they are not equivalent, so we will not pretend otherwise.
1. A registered device, plugged in
What it is: a device that has been type tested, appears on the register, keeps AC output at or under 800W, and contains no battery.
| For | Against |
|---|---|
| The one route the legislation actually created for socket connection | Smaller choice — the register held only 31 devices at the time of writing |
| No electrician, no installation cost | Usually more expensive than an unregistered import |
| Anti-islanding independently tested | Capped at 800W AC, so limited output |
| You can give your insurer and your network operator a device reference | One device per household under current G98 rules |
| Take it with you when you move |
2. Unregistered equipment, installed as a fixed system
What it is: the same panels and inverter, wired in permanently by a qualified electrician under the normal G98 or G99 process instead of being plugged into a socket.
This is the option most people do not realise they have, and it is completely lawful.
| For | Against |
|---|---|
| Opens up equipment outside the plug-in rules, including battery systems | You are paying an electrician — the saving that made plug-in attractive largely goes |
| Not limited to 800W, so a bigger system is possible | Not portable; it becomes part of the building |
| Batteries are available on this route | Needs the installer's paperwork and sign-off |
| A competent person takes responsibility for the installation | Landlord and freeholder permissions get harder for a permanent alteration |
If you have already bought a kit that turns out not to be a plug-in device, this is usually your answer. The equipment is not wasted. It is a different installation method.
3. Plugging in an unregistered device anyway
We are not going to give you a balanced table for this one, because it is not a balanced choice.
An unregistered device plugged into a socket is not using the route SI 2026/848 created. Beyond the legal position, the practical problems are real and they fall on you rather than on the manufacturer:
- The anti-islanding behaviour has not been independently verified. That is a risk to the people who work on the network, not only to you.
- Your network operator has no device reference to record against your address.
- Your insurer's position is genuinely unknown. We checked twelve major UK home insurers and none has published anything at all about plug-in solar — so nobody can honestly tell you either that you are covered or that you are not.
We are not going to tell you your insurance would definitely be invalid, because we could not verify that and neither can the sellers who say it. We are telling you that nobody knows, and that "nobody knows" is a bad position to be in after a fire.
What sellers say, and what to check
Some of the strongest claims in this market are made by people selling you something. Two to be careful with:
"Unregistered inverters will invalidate your insurance." We could not verify this. No insurer and no industry body has published anything saying so. The clearest statement we found is from five electrical safety bodies — the ECA, Electrical Safety First, the IET, NICEIC and SELECT — who said in June 2026 that it is "not yet clear how insurers would respond". It may turn out to be true. As things stand, nobody has actually said it.
"Certified" and "approved". Ask what specifically is being claimed. The useful question is: what is the device's reference number on the tested list? Every tested device has one, and it looks like UKSOL/21008/V1/A4. Its formal name is the System Reference. A seller who cannot give you theirs is asking you to take their word for it.
Also worth knowing: a registered inverter does not mean a registered kit. Some kits are registered in their own right; others contain an inverter that a manufacturer registered separately. Those are different things, and the second does not automatically give you the first.
Whatever you choose, you still have to tell the network company
This catches people out. The manufacturer registering the device is not the same as notifying your network operator that your home now has one connected. Both have to happen, and the second one is your job.
We have written separately about how to do that, and about the awkward fact that most network operators' forms currently ask for an installer's details that a self-installing householder does not have.
Where we stand
We do not sell kits and we do not take a view on which brand you should buy. We list what we can establish and we say plainly when we cannot establish something. On this particular question our position is:
- Not on the register is not the same as illegal.
- It does mean the plug-in route is not available for that device.
- The fixed-installation route usually still is, and that is a real option rather than a consolation prize.
- Anyone telling you with certainty what your insurer will do is telling you something they cannot know.
We re-check the register daily. Where this piece quotes a count, it is read from our own mirror at the moment the page is served.