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In March, the UK Government announced that plug-in solar power was “months away” from hitting the shelves across the country. As a self-confessed solar fanatic, it’s exciting.
The change, which takes a lot of inspiration from its runaway success in Germany, will allow people to mount relatively cheap solar panels on their balconies and in gardens, to plug them straight into their mains, taking money off their bills.
Now we have a lot more detail on the plans, as ministers have launched a consultation on getting the product specifications right for the UK market. There is good news and there is bad news here.
Here’s where we’re at right now. Previously plug-in solar panels couldn’t be legally sold or used in the UK because our rules on electrical plugs didn’t allow them to be used for power-generating equipment. While the Government has updated some rules on this, it hasn’t yet finished the job.
Ed Miliband’s department DESNZ proposes amending the plug and sockets safety rules to allow an exemption for compliant devices.
Alongside that, ministers will introduce an ‘interim product specification’ setting out safety standards for what can be sold to consumers, modelled on Germany’s (for speed) until we’ve got our own.
The consultation on all this closes on 30th June, suggesting ministers want to move relatively fast, now that they’ve got going. But it still suggests that plug-in solar products are highly unlikely to be widely-available on the shelves this summer, when they would be most effective in cutting bills.
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What the Consultation Tells Us
We’ve been rummaging through the documents to set out what has not been covered in the press.
Firstly, there’s a big one. Batteries are explicitly excluded and will remain illegal to sell or be used for plug-in solar.
This is a blow for many, because batteries allow you to make use of cheap overnight tariffs. The solar charges your battery in the day, the sun sets, and then you run your home on that power until say 11pm or midnight, when the battery recharges on a low-cost tariff overnight. Without that, the economics are a lot worse (though still worthwhile).
DESNZ has confirmed to Byline Times that allowing batteries as part of the set-ups “would need its own decisions and approvals”, and they’ve given no timeline given for that. So battery-connected plug-in solar is a while off yet.
Output from the solar panels into your home will be capped at 800 VA (800 watts in practice). Most panels come in around the 470 watt mark. Put simply, if you install two on your balcony (giving, say, a 900-ish watt output potential), the energy it puts into your mains will be capped at 800W (which is fine, as panels rarely provide 100% of their stated potential).
The overall size of the set-up will be capped at 2,000W. So you could have four plug-in panels theoretically, but it’s unlikely to prove cost-effective as you’d only get max 800W going into your home.
For reference, my home of three people usually has a ‘baseload’ (the constant hum of fridges, devices on standby, chargers, a few lights etc.) usage of about 350W. On a good day, one well-placed panel could cover a lot of that.
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It will also be capped at one device (plug-in set-up) per household. But several footnotes flag this may change to “per circuit” depending on consultation responses. Under that version of the plans, you might be able to have one plug-in set-up for your shed, and another for your house. Or even several in your house if you have a few circuits.
The department has published a safety study as part of this work. The headline findings were positive. But the details show a bit more nuance. One product tested – a supposed 400W device – exceeded its supposed rating at every single voltage point tested.
To be clear, there are plug-in solar products on the market right now, and forums are full of people with their own set-ups. I hesitate to call them illegal, but…they are probably illegal.
The Government’s safety study is clear that not all devices currently sold in the UK meet the standards they claim to be certified against. Buyers beware.
What the Docs Don’t Tell Us
There are big unresolved questions over the planning status for balcony or external-wall mounted units, under Permitted Development Rights. There is a risk (small-c) conservative councils will come down on visible plug-in solar set-ups like a ton of bricks, not least in conservation areas. No planning changes seem to be in the pipeline to get around that.
The study also notes that a dedicated fire safety assessment for blocks of flats (particularly ones with fire-prone cladding) has not been done. It is flagged as “priority follow-on work”. But again, it’s not clear when that will be done. Byline Times was told by officials it will be in “due course.” Those living in high-rises may be in limbo for a while.
The tax question also looms large. Currently, no VAT is applied to solar products that are professionally installed – in other words, nearly all current roof-mounted solar installations. That’s a 20% saving.
