Is plug-in solar safe? UK safety rules and advice

What did the government’s testing find?

DESNZ published an electrical safety study in June 2026. The Government Response says testing “did not identify safety concerns that would prevent the safe operation of plug-in solar devices with a maximum rated output of 800W on appropriately protected ring circuits”.

The key words are “appropriately protected ring circuits”. The finding assumes your circuits have suitable protection, which is why the home checks below matter.

DESNZ also says that “the UK safety specification is more stringent than that of Germany”. That’s the government’s claim.

What safety rules are built into a compliant kit?

The Interim Product Specification is binding on products. Its main safety rules, grouped by what they cover:

Area	What the specification requires
Overloaded circuit or socket	No more than 800 VA and 3.5 A output. Moulded, non-rewireable BS 1363-1 plug with a fuse of no more than 5 A. Socket circuits only, not lighting circuits or spurs feeding a cooker or boiler
Connection	Straight into a fixed BS 1363-2 socket. No extension leads, multi-way adaptors, travel adaptors or RCD adaptors
Earth leakage	Device DC residual current no more than 5 mA
Panel wiring	Up to 4 panels, no more than 2 in series, 120 V DC open-circuit maximum, no Y-connectors
Weather	Outdoor parts and outdoor sockets at least IP55
Fire spread on the building	Not on timber balconies, timber cladding, ACM/MCM/HPL cladding, or buildings under external wall remediation. Not fixed to walls between dwellings
Panels falling or blowing off	Reversible, non-permanent mounting. Cable ties, rope, tape, bungees or straps alone aren’t allowed
Someone working on “dead” wiring	A warning label near your consumer unit, plus DNO registration
Batteries	No batteries

What should you check in your home?

The specification tells users to check for modern residual current protection (RCBO). Homes with older fuses and no RCBOs should be checked and upgraded by an electrician.

It also says:

• More than 960 W of panels: the manufacturer must advise you to “consider professional assessment of your existing electrical installation”.
• If the circuit needs changes, such as replacing a circuit’s protective device, that’s work for a qualified electrician only.
• Test your RCBO periodically while the kit is generating.

Details in sockets and wiring.

What do electrical safety bodies advise?

These organisations aren’t regulators, and some of their advice is stricter than the specification. We quote them as their own recommendations.

Electrical Safety First

From its plug-in solar page and consumer guide, the charity:

• Recommends “at least a Type A bidirectional RCD protecting circuits intended for use with plug-in solar panels”. Homes with Type AC RCDs “should not use plug-in solar systems without first upgrading”.
• Recommends an assessment by a competent electrician registered with a competent person scheme before purchasing.
• Says “Never connect plug-in solar through extension leads or adapters.”
• Advises buying from reputable retailers rather than third-party marketplace sellers.

The IET and industry bodies

The IET urged households to check their electrical safety before using plug-in solar, and has published a position paper.

A joint statement from ECA, Electrical Safety First, the IET, NICEIC and SELECT (9 June 2026) said “safety must come first” and that kits “should only be sold once the right product checks and guidance are in place”.

Who enforces the rules?

There’s no new enforcement regime for plug-in solar. The Government Response says existing product safety law applies. So the most useful thing you can do is buy a Compliant kit from a reputable seller.

What to do next