MSE guide: plug-in solar panels

NorthernMarc

Since a plugin Solar system would be below 3.68kW per phase I would assume no change to the current rules which means the DNO registration is a notification under G98 rather than a full application under G99.

squirrel59

What about: Step 4: Notify your local electricity network operator within 28 days of installation

Why??? So they can start levying some kind of tax on you later on? What happens if you don't register?

Robert109

Could we have a comprehensive overview of the issues for those with existing solar arrays in the next issue of the guide? I was an early adopter -top rate FIT and theoretical maximum of 3.68Kw but the panels point east of south and only generate at full power for a couple of hours. I have added a battery to store the surplus but I can only get more or less fully off-grid for a few weeks in the year. I do have other parts of the property suitable for plug-in to get longer generation in the afternoon, and more stored going into the evening, but I have struggled to get answers on the practical feasibility - will the electrics take it? - and the implications for my FIT payment. I am sure I can't be alone in this.

NorthernMarc

https://forums.moneysavingexpert.com/discussion/comment/82107412#Comment_82107412

Your calculations look very accurate, but as the article states and as an electrician I agree you should be obtaining a EICR before thinking of installing one of these panels and have an external socket minimum IP66 rated installed, both of which could cost you in excess of £250 each, plus any remedial work coming from the EICR, as I professionally would recommend a minimum of an RCB on the ring final being used and preferably an RCBO, which in many cases will need a new consumer unit, at a cost dependant on property size and location, £400 to £1,000.

When you factor even the minimum sensible action EICR and External IP Socket £500, you are nearly doubling the payback period.

NorthernMarc

https://forums.moneysavingexpert.com/discussion/comment/82107711#Comment_82107711

Many battery included systems now isolate the house from the grid so the solar and battery can continue supplying the house, but you do put forward a great point and I assume the Invertor these come with shutdown the panel in a power cut as roof top systems do.

joineduptech

You mention tenants renting but what about leasehold property (flats), do they need permission from the building landlord/management company?

NorthernMarc

https://forums.moneysavingexpert.com/discussion/comment/82107625#Comment_82107625

I can only assume the invertors now packaged with the panels work the same as roof invertors and use a safety feature called anti-islanding protection to automatically disconnect within milliseconds when they detect that mains grid voltage or frequency has disappeared.

Maggie73

I have existing solar panels and want to add some portable panels + battery.

Am I legally allowed to do this?

Would it mess up the main system of exporting to grid from my existing system on the roof?

Would I lose the money the government gives me each quarter (which is quite a bit) to export to grid?

If I can have both systems, could I just plug in the portable system just when I want to charge up the battery, or as an add on to charge my car and then unplug it again?

Anyone any ideas?

I don't want to get a portable and end up losing money.

Wanderlustg

The guide mentions attaching to fences, but doesn't point out there is additional planning permision needed when attaching to anything wooden.
Under the updated UK planning and safety rules taking effect in August 2026, you cannot install or mount a plug-in solar panel on a wooden fence, gate, or any timber structure under permitted development rights. Doing so voids permitted development, meaning it would require full planning permission from your local council, specifically due to fire safety concerns regarding timber mounting.

Source (search for wood) https://www.legislation.gov.uk/uksi/2026/896/made

prowla

https://forums.moneysavingexpert.com/discussion/comment/82107574#Comment_82107574

https://forums.moneysavingexpert.com/discussion/comment/82107672#Comment_82107672

I don't think the plugin system will charge your existing batteries though.