Can plug-in solar backfeed the grid in the UK? Do you get paid?
One of the most misunderstood parts of plug-in solar is not the panel. It is what happens electrically once the inverter starts generating into a live installation.
People often ask whether plug-in solar can send power back to the grid, whether that means the meter runs backwards, whether the inverter “talks” to the grid, whether the pins on the plug become live, and whether there is any realistic money to be made from export. These are all sensible questions. The short version is that yes, small solar can export if generation is greater than what the home is using at that moment, but the real value is usually in reducing imports and covering base load rather than earning meaningful export income.
Short answer: yes, plug-in solar can backfeed the grid in the sense that excess electricity can be exported out of the property if generation exceeds demand.
In practice: that does not usually mean meaningful income. For small systems, the main benefit is normally that part of the home’s daytime demand is covered first, so fewer units are imported from the grid.
This subject becomes much clearer once one point is understood properly:
a grid-tied solar inverter does not “push electricity to a chosen destination” in a simplistic way. It synchronises with the electrical system and injects power into it. The power then flows to wherever demand exists at that instant. If the property is using all of it, nothing is exported. If the property is using only part of it, the remainder can flow out through the meter and into the wider network.
That is why this page sits naturally alongside does plug-in solar need to be registered?, is plug-in solar legal in the UK? and RCBOs, bidirectional current and plug-in solar. Backfeed is not a side issue. It is part of the reason the rules exist in the first place.
What “backfeeding the grid” actually means
In plain English, backfeeding the grid means electricity flowing from the property back out towards the public supply network.
That flow can happen when:
- the solar inverter is generating power,
- the home is not using all of it at that moment,
- and there is no other local sink for the excess energy.
In that situation, the excess does not just disappear. It moves out through the meter and into the grid.
Simple version: the home uses what it needs first. If solar generation is higher than that demand, the surplus can become export.
This is not something unique to large rooftop systems. It is simply what grid-parallel generation does when generation exceeds local consumption.
How plug-in solar actually connects to the electrical system
A plug-in solar system is usually discussed in terms of panels and a plug, but the part doing the real electrical work is the inverter, often a microinverter.
The inverter takes DC from the panel and produces AC that is synchronised with the supply. That means it aligns with the voltage and frequency of the existing grid supply rather than behaving like a separate standalone generator that is trying to impose its own waveform on the installation.
Once it is synchronised, it can inject power into the installation.
That is a crucial distinction. The inverter is not “sending power to a specific appliance”. It is feeding the installation, and the installation’s loads then draw what they need.
How electricity can move in two directions without anything mysterious happening
This is the point that many people find least intuitive.
A lot of homeowners picture electricity as though it must always come one way from the grid into the house. That is understandable, because that is what normally happens in a property with no generation. But once a source of generation is connected, the direction of net power flow can change.
In practical terms:
- if the house needs more power than the solar is producing, power still comes in from the grid,
- if the solar exactly matches the house demand, imported power can fall very close to zero,
- if the solar exceeds house demand, the excess can flow back out to the grid.
So the concept is not that electricity suddenly behaves in an unnatural way. It is simply that the net balance at the point of connection can move in either direction depending on generation and demand at that instant.
Diagram 1: Solar reducing import but not exporting
Diagram 2: Solar exceeding demand and exporting
Why plug-in solar can reduce import even when nothing is “sent back”
A useful way to understand the everyday benefit of small solar is to think in terms of base load.
Most homes have a background demand through much of the day: routers, refrigeration, standby loads, pumps, controls, ventilation, electronics and a general mix of smaller ongoing consumption.
If a plug-in solar setup is generating into that background demand, the property simply needs less from the grid. That reduction in import is often the main practical benefit.
This is why people can misunderstand the subject if they focus only on export. The most useful contribution from a small setup is often that it trims the imported daytime load rather than producing a large export surplus.
In plain terms:
for most small plug-in solar systems, the best result is usually not “selling power”. It is that the home quietly buys fewer units from the grid during generating hours.
Does plug-in solar “talk to the grid”?
In casual language, people often say the inverter “talks to the grid”. That is not a bad shorthand, but the more accurate description is that the inverter monitors grid conditions and synchronises with them.
A grid-tied inverter must not operate as if the network does not exist. It is designed to detect the electrical characteristics of the supply and generate in step with them.
That includes the basic requirement that the inverter should only operate when the conditions it expects are present. If those conditions disappear, such as during loss of mains, it should stop exporting.
What happens in a power cut, and why the plug pins do not just become live
This is another area where understandable concern exists.
A properly designed grid-tied microinverter is not supposed to continue energising the network during a power outage. If the supply fails, the inverter should disconnect and stop generating into the installation.
This behaviour matters for safety. Network engineers must not be exposed to a situation where small private generators keep a supposedly dead part of the network energised.
That is why anti-islanding behaviour and loss-of-mains protection are fundamental parts of compliant grid-tied equipment.
Important:
In normal compliant operation, plug-in solar is not meant to continue exporting during a grid failure. If the grid goes down, the inverter should stop. This is one of the key reasons small grid-parallel generation is subject to formal requirements rather than being treated like an ordinary domestic appliance.
This also helps answer a common fear about the plug itself. People sometimes imagine that if a panel is in sunlight, the plug pins on a connected system somehow become a dangerous live source waiting to energise anything they touch. The real answer depends on the product design and its protective arrangements, but in a proper grid-tied arrangement the inverter is intended to operate only under the right supply conditions and not as a crude always-live source.
Why G98 matters so much here
Backfeed is not a strange side effect. It is one of the reasons connection procedures exist.
G98 exists because even small-scale generation still connects in parallel with the public low-voltage network. The DNO needs to know what has been connected, the equipment needs to be suitable, and the behaviour under normal and fault conditions matters.
That is why the wider registration question is not just paperwork for the sake of paperwork. It is part of acknowledging that the installation is no longer just a passive consumer of electricity.
If you have not already read it, the fuller guide is does plug-in solar need to be registered?. This page sits directly underneath that topic because export is one of the core reasons the network operator is interested in the connection at all.
Do you get paid for exported electricity?
Potentially yes, but this is the part where many expectations need to be brought back to reality.
In the UK, export payments are not simply triggered because a panel is connected and some power occasionally leaves the property. There needs to be a suitable export arrangement, and metering matters.
If export is to be paid accurately, it needs to be measured. That is why the meter question is important.
A household that wants payment for exported units needs to think about:
- whether the supplier offers an export tariff that the installation can use,
- whether the generation and export are actually being measured appropriately,
- and whether the system and its paperwork fit the relevant criteria.
The point that often gets missed is that very small export volumes are not usually where the real value sits.
For small plug-in solar, export income is usually not the main story
A lot of confusion comes from people mixing together two different ideas:
- using solar to reduce what you buy from the grid,
- exporting enough electricity to create meaningful income.
For a modest plug-in solar setup, the first point is usually the important one. The second point is often much smaller than people expect.
If a sub-800W type setup is approved and operating properly, it is generally not a large generator. In many homes it will spend much of its useful time offsetting base load rather than producing a major export surplus.
That does not mean export never happens. It means the most realistic benefit is normally self-use first.
Practical view: if a small plug-in solar setup occasionally exports, that is entirely possible. But the setup is usually more valuable as a quiet importer reducer than as an export earner.
Who might still benefit from export payments?
There are households where the export conversation is more meaningful.
For example, if a property already has an existing solar arrangement, existing export metering, or a current G98 or G99-connected setup with a supplier arrangement already in place, then an additional small amount of exported energy may form part of the wider picture.
In those cases, the home may already be structured in a way that makes export accounting more straightforward. But that is not the same as saying a typical first-time small plug-in setup should be viewed as an export-income product.
The more realistic framing is still that export might happen and might be measured, but the principal day-to-day win is usually reduced import.
Why a suitable meter matters
If electricity is exported and the intention is to be paid for it, the export has to be measured properly.
That sounds obvious, but it is one of the most practically important parts of the whole subject.
Without appropriate metering, there is no reliable basis for accurate export payment. More broadly, metering also gives the homeowner a clearer view of what is actually happening:
- how much is being imported,
- how much is being exported,
- and how much solar is simply being absorbed on site by normal house demand.
So even beyond payments, good metering helps clear up the confusion around whether the solar is “doing anything”. Very often it is. It is just doing it by reducing imports rather than by creating dramatic visible exports.
What about batteries and cheap overnight tariffs?
This sits slightly alongside the export conversation but is worth covering because it often comes up at the same time.
Some households have access to cheap overnight electricity and use that to charge a battery for later use. In a broader home energy strategy, that can make sense. A battery may then discharge during higher-cost periods and reduce grid imports later in the day.
But that is not the same thing as saying plug-in solar is suddenly becoming an export-income machine.
Cheap overnight charging and daytime solar generation are two different levers in the wider energy picture:
- solar can reduce daytime imports and may occasionally export,
- batteries can shift energy from one time to another,
- and cheap overnight tariffs can make storage strategies more attractive in the right circumstances.
If you want the wider storage side of this, read battery storage and plug-in solar in the UK.
What this means for expectations in the real world
The cleanest way to think about small plug-in solar is this:
- during daylight hours, it can help cover part of your home’s demand,
- if it generates more than your home is using, the excess may become export,
- that export behaviour is part of why grid connection rules and type-tested equipment matter,
- and if you want to be paid accurately for exports, metering and supplier arrangements matter as well.
That is a much more grounded picture than either of the two extremes often seen online:
- “it cannot possibly export at all”,
- or “you will be making easy money from the grid”.
Neither of those descriptions is good guidance.
How this connects back to the other core guides
This page is best read as part of a wider group:
- does plug-in solar need to be registered?
- is plug-in solar legal in the UK?
- RCBOs, bidirectional current and plug-in solar
- can you plug solar panels into a normal socket in the UK?
- is plug-in solar actually worth it?
- what to watch out for before buying
Together, those pages explain not just whether a product sounds attractive, but how it really behaves electrically and where the UK rules fit into the picture.
FAQ: the questions people usually mean when they ask about backfeed
Can plug-in solar really send electricity back to the grid?
Yes. If the inverter is generating more power than the home is using at that moment, the excess can flow back out through the meter into the grid.
Does that mean you get paid automatically?
No. Export payments are not automatic just because export happens. Proper metering and a suitable export arrangement are needed if payment is the aim.
Is backfeed the reason G98 matters?
It is one of the reasons. Small generation still operates in parallel with the public network, so connection rules, suitable equipment and notification matter.
Will the solar keep running during a power cut?
A proper grid-tied microinverter should stop exporting during loss of mains. It is not supposed to continue energising the network during an outage.
The bottom line
Plug-in solar can export electricity back to the grid. That is not a strange loophole or an unusual edge case. It is simply what can happen when a grid-tied inverter is generating more power than the home is consuming at that moment.
The more useful practical point, however, is that small solar is often most valuable because it reduces imported electricity first. Export may happen. Payment may be possible in the right circumstances. But for modest systems, the day-to-day benefit usually lies in covering base load and trimming daytime imports rather than creating meaningful export income.
The simplest honest summary is this:
yes, plug-in solar can backfeed the grid, and that is exactly why proper connection rules, compliant inverter behaviour, G98 notification and sensible metering matter. But if you are thinking clearly about a small UK setup, the main aim should usually be self-use and reduced import, not chasing a tiny export payment.
This page is intended as practical guidance, not a substitute for current standards, DNO requirements, supplier export terms, product documentation or professional advice on a specific installation. For decisions involving grid connection, compliance, certification, protection or export metering, use the current applicable requirements and competent professional judgement.