If your house draws 200W continuously just to exist — fridge, router, standby devices, a few chargers — 800W of solar is paying for all of it for free during every sunny hour of the day. That is the actual story of plug-in solar. Not “can it run my kettle.” Not “will it power my washing machine.” It is quietly, invisibly covering the things you never think about, hour after hour, every day the sun is out.
The government’s announcement this morning said plug-in solar “can provide up to 20% of an average home’s electricity use” and is “enough to run a typical fridge, television, Wi-Fi router, laptop, phone charger and an Xbox S operating at once when the sun is shining.” That claim is all over the news today. Here is what the numbers actually say — including the bits the headlines missed.
First: 800W is the peak, not the average
800W is the maximum AC output of a certified plug-in solar system — what it produces at solar noon on a clear summer day with panels facing due south. In the UK, that peak is hit a handful of times a year. On a typical overcast autumn afternoon it might be producing 80 to 150W. On a decent spring morning, 400 to 600W. On a heavily overcast winter day, 30 to 80W. The government’s list of what it can run assumes peak output.
I have been running an EcoFlow STREAM Ultra X on the south fence here in Peterborough since earlier this year. On a clear July afternoon I have seen over 900W from four panels. On a grey February day the same setup peaked at 47W. Both are real numbers from the same system in the same garden. The claim is true. It just needs context.
Crucially: even on an overcast day a well-positioned system still produces 80 to 150W continuously. Your fridge and router combined draw around 55 to 65W. Solar is covering the most always-on things in your home for most of the daylight hours even in poor weather. That matters more than the peak figure.
What the government’s list actually draws
Here are the real wattage figures for each appliance on that list.
A modern fridge-freezer: 40 to 50W average. This is the number to understand properly. A fridge rated at 150W peak does not draw 150W continuously — the compressor cycles, running roughly 30 to 40% of the time. The average draw across the day is 40 to 55W on a typical A-rated fridge-freezer. Older or larger models run higher.
One question that comes up constantly: does the compressor startup surge trip the inverter? No. The solar system feeds into your house circuits and the grid supplies the rest simultaneously. When the fridge compressor kicks on and briefly spikes to 300W, the grid covers that surge automatically. Solar and grid work in parallel — there is no switching, no tripping, no drama. The solar just reduces how much the grid has to supply.
A modern LED television: 60 to 90W. A 43-inch LED TV draws around 65 to 80W. A 55-inch runs 80 to 110W. Older LCD sets run higher. Call it 70W for a typical UK living room TV.
A Wi-Fi router: 8 to 15W. A standard home broadband router draws 8 to 12W continuously. A combined router and hub unit from a major provider runs up to 15W. Call it 10W.
A laptop: 20 to 65W. A modern thin-and-light laptop charging and running simultaneously draws 20 to 45W. A performance laptop under load draws 45 to 95W. Call it 45W for a typical everyday laptop.
A phone charger: 5 to 18W. A USB-C charger actively charging a modern smartphone draws 10 to 18W, dropping to near zero once fully charged. Call it 12W while charging.
An Xbox Series S: 65 to 75W. The Xbox Series S draws around 70 to 75W while gaming. Call it 70W while playing.
The total: roughly 250W. Fridge (48W) + TV (70W) + router (10W) + laptop (45W) + phone charger (12W) + Xbox Series S (70W) = 255W. The government’s claim holds up. That combination draws around 250 to 260W in practice — well within what 800W of solar covers at peak, and still covered by 300 to 400W of solar on a decent cloudy day.
The reframe: base load is where solar earns its money
Here is what most coverage misses. Solar does not power your appliances in isolation — it feeds the circuit your appliances draw from, and the grid tops up whatever the solar cannot cover in real time. The question is not “which appliances does solar power” but “how much of my total consumption does solar offset?”
Your base load is the electricity your home consumes continuously whether you are thinking about it or not. Fridge, router, broadband modem, TV on standby, smart speaker, phone charger left plugged in, boiler controls, smoke alarm, any clock radios or digital displays. Add it up for a typical UK home and you are looking at 150 to 300W drawing all day every day.
On a clear summer day, 800W of solar covers all of that base load and more for around 6 to 8 hours around midday — with surplus going into the battery if you have one, or feeding back to the grid if you do not. On an overcast day, 100 to 200W of solar covers most of the base load for most of the daylight hours. The solar is quietly offsetting the stuff you never think about, continuously, every hour it generates.
That is the financial case for plug-in solar. Not dramatic moments of powering your TV and Xbox. Steady, invisible offset of your baseline consumption, day after day, month after month.
What solar is genuinely not good for
Anything with a heating element that runs hard and fast. Your kettle draws 2,000 to 3,000W for about 2 minutes to boil. Your toaster draws 800 to 1,200W for 2 to 3 minutes. Your electric shower draws 7,000 to 10,500W continuously while you use it.
Solar can offset part of these loads — if 800W is generating when you boil the kettle, you are pulling 1,200 to 2,200W from the grid instead of 2,000 to 3,000W. But a concrete way to feel this: a 2-minute kettle boil costs around 0.6p in electricity. With 800W of solar running at the same time, you save around 0.3p on that boil. You are not buying a plug-in solar system to save 0.3p on a cup of tea. The value is the base load, not the kettle.
Similarly: washing machine on a hot cycle (1,800 to 2,200W), tumble dryer (2,000 to 4,000W), dishwasher on a full cycle (1,200 to 1,800W), oven (2,000 to 3,500W). None of these are fully covered. But if you run them during peak solar hours you do reduce what you pull from the grid by 800W for the duration.
The midday appliance shift: a concrete saving
Running your washing machine at midday on a clear day rather than at 7am is one of the most useful habits to build with plug-in solar. A 1,800W machine on a 90-minute cotton cycle uses about 2.7 kWh. With 800W of solar offsetting it for the full 90 minutes, you save about 1.2 kWh — roughly 31p at current rates. Per wash. Every time you shift a cycle to midday on a clear day, that is a real saving on top of the base load offset.
The dishwasher, the tumble dryer, the slow cooker — same principle. Run them during generation hours and the solar reduces your net grid draw for the whole duration. It does not eliminate it, but it meaningfully reduces it.
What if I am out all day at work?
This is the question that comes up in every forum thread, and it deserves a straight answer. If you are out 9 to 5, without a battery you self-consume maybe 15 to 20% of what you generate — your fridge, router, and standby loads run while you are out, but they only draw 80 to 120W while your system is generating 400 to 800W at peak. Most of your solar generation feeds back to the grid unused, earning nothing.
At 15% self-consumption your annual saving is around £25 to £30. That is the honest number for someone who is out all day with no battery. The financial case is marginal without a battery if you are a commuter.
A battery changes this completely. The EcoFlow STREAM battery stores surplus daytime generation and uses it to cover house load in the evening when you are home, pushing self-consumption to 70 to 80%. For someone out all day, a battery is almost as important as the panels themselves. The battery ROI article has the full numbers on whether adding storage makes financial sense for your usage pattern.
The 20% claim: what is actually true
The average UK home uses around 2,700 to 3,100 kWh per year. An 800W south-facing system in central England generates around 580 to 650 kWh per year. At 35% self-consumption without a battery, you actually use around 200 to 225 kWh of that generation — roughly 7 to 8% of average consumption.
With a battery pushing self-consumption to 75%, you self-use around 430 to 490 kWh — 14 to 18% of average consumption. The 20% headline is achievable: a home with below-average consumption (perhaps 2,200 kWh per year), good generation, and high self-consumption with a battery could hit 20%. For most homes, 7 to 12% without a battery and 14 to 18% with is the honest range.
That is still meaningful. 7 to 12% of your electricity bill at current prices is £50 to £90 per year from a system costing £350 to £500. The payback is real. The 20% headline is optimistic rather than dishonest — it just needs the battery assumption made explicit.
What overcast days actually look like
People worry that UK cloud cover makes solar pointless. It does not, for one specific reason: your base load. On a heavily overcast day an 800W system produces 30 to 80W. Your fridge and router draw 55 to 65W. Even on the worst days in winter, solar is often covering your two most continuous loads for most of the daylight hours. That is not dramatic — but across 365 days it adds up to meaningful units of electricity.
On a typical UK overcast day (not heavy cloud, just grey), expect 150 to 250W. That covers the full base load described above — fridge, router, modem, phone charger, and several standby devices — with some headroom. Grey Britain is not the enemy of plug-in solar that the instinct suggests.
The honest bottom line
800W of plug-in solar does not transform your electricity bill. It quietly and continuously chips away at the part of your bill that is hardest to reduce any other way — the base load that runs whether you are home or away, awake or asleep. Over a year in central England, at realistic self-consumption rates, it saves £50 to £130 depending on whether you have a battery and how well your usage overlaps with generation hours.
On a system costing £350 to £500, that is a 3 to 8 year payback depending on setup. After payback, another 15 to 20 years of free savings. The numbers work. They just work quietly, not dramatically.
For a full breakdown of what 800W generates month by month across the year, see our 800W output article. For a savings figure specific to your postcode, orientation, and tariff use the savings calculator. For which kit to buy now that it is legal, see our best plug-in solar panels guide. And if you have bought a kit today and have questions about what the numbers in your app actually mean, see our guide to reading the solar app.
Bought a kit today and watching your first generation numbers come in? Leave a comment with your location, orientation, and what you are seeing — first-day real data from around the UK is genuinely useful and I will reply to everything.