Everything you need to know about plug-in solar panels

1. So, what actually is plug-in solar?

Think of plug-in solar as a solar panel with a normal household plug on the end.

No scaffolding, no expensive electricians, and no holes through your roof. You literally unbox 1 or 2 compact solar panels, set them up in a sunny spot (like an outdoor wall, garden, or shed), and plug the cable straight into a weatherproof outdoor socket.

For plug-in solar you need a couple of parts, here's how the 3 simple bits of kit work together:

1. The Panels catch the sunshine

2. A Micro-Inverter (the smart little box attached to the back) turns that raw sunshine into usable household electricity

3. The Cable & Plug feeds that free, green energy straight into your home's wiring

4. Plus, you'll need a mount, either for a wall or to sit off the ground as an angle

   
   

Once it's plugged in, your lights and appliances automatically draw from the solar energy generated first, before pulling power from the grid.

It’s solar, made simple.

2. What it can (and can’t) do

Plug in solar is like a constant sip of free energy for your home, rather than a giant bucketful.

It won't run your whole house. Instead, while the sun is out, it quietly handles the background stuff you use that require electricity you may not think about, like your fridge, Wi-Fi router, TV, lamps, laptop charging and standby lights.

It doesn't completely replace the grid. Rather it just nibbles away at your baseline energy bill, so you draw less power (and spend less money).

3. Where can you put it?

Basically, anywhere sturdy that gets decent sun and sits near an outdoor plug:

• Gardens: Set up on angled floor stands on a weighted ground mount.

  
  

• Outbuildings: Fixed flat or tilted onto shed roofs, garage walls, or fences.

  
  

• Exterior Walls: Mounted directly onto brickwork or timber exteriors.

4. How much energy can it make?

In the UK, generation depends on orientation, angle, and how generous the weather’s feeling:

• The average output: A standard 800W kit generates around 500 to 800 kWh per year in optimal conditions

  
  

• The best spot: South-facing setups capture maximum midday sun where East/West setups spread your power generation across morning and late afternoon

  
  

• What to avoid: North-facing setups as you won't catch enough direct sunlight to make it worth your while. And any obstructions such as trees, or even glass can limit the generation potential

5. What happens to the energy you don’t use?

When your panels make power, it flows straight to whatever is running in your home first. If your panels generate 600W and your home only needs 300W, that extra 300W automatically slips past your meter and flows out into the local grid.

6. Can you get paid for exporting energy you don’t use?

For now, these setups don't come with a battery due to UK regulation, so you can't store the energy for later.

When the sun’s shining, your home uses that green energy power to run your appliances right then and there. If your panels generate more than you're using, the extra leaks back out to the grid.

You can join an Octopus export tariff if you like, such as Outgoing Octopus, to benefit from any excess power.

Your best savings with plug-in solar will be predominantly from subsidising the electricity you're using during day rather than from export. Exact savings will vary depending on your home electricity usage, the sunlight exposure and the number of panels, but could be anywhere from £50 to £150 savings on your electricity bill per year.

7. Safety & installation (the crucial stuff)

"Plug-in" doesn't mean "anything goes". Even with the new plug-in rules, electricity is still heavily regulated — and for good reason. Before purchasing and installing, there are a few non-negotiables to tick off:

• Tell your DNO: You'll need to notify your local Distribution Network Operator (DNO). They're the people who manage your local electricity network, and letting them know helps keep it safe and balanced.

  
  

• Check your electrics: Your fuse box and outdoor socket need to be suitable for a plug-in solar system. Always plug directly into a weatherproof, exterior-rated 13A socket — no extension leads running through windows. If you're unsure whether your setup is suitable, it's worth getting an electrician to take a look and read up on the official safety information here

  
  

• Mount your panels safely: Each panel weighs 22kg, so make sure the structure you're mounting them to can safely support both the weight of the panels and any wind gusts. You definitely don't want your solar system taking flight in a November storm.

  
  

• Get permission if needed: If you rent or live in a leasehold property, check with your landlord, freeholder or building management before attaching anything to any outbuildings.

  
  

• One kit per home: To keep things safe and avoid overloading your electrical setup, you're limited to one plug-in solar system per home. If you're looking to generate more power, a full rooftop solar system might be a better fit.

8. Will it work with my existing traditional rooftop solar?

Yes, although this would be two different and independent systems. Just make sure you contact your DNO first, to make sure its ok to add the plug-in solar system to your home without overloading it.