How Do You Read A Smart Meter With Solar Panels?

A smart meter in a solar home records more than one energy flow, and the display figures can look confusing when you're not sure what each one means. Where a standard meter shows a single cumulative total, your meter now records electricity coming in from the grid and electricity going back out, while a separate device tracks everything your panels generate. 

This guide explains what each reading represents, how to find it, and how to use the figures together to understand whether your system is performing as expected.

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Key Takeaways

• A smart meter in a solar home records grid import and grid export as two separate cumulative figures, but neither reading shows how much solar energy you are using directly in your home.
• SMETS1 meters, commonly installed before 2019, often cannot transmit half-hourly export data to the national grid network, meaning some suppliers estimate rather than measure export when calculating Smart Export Guarantee (SEG) payments.
• Self-consumption, the proportion of solar energy used directly in your home rather than exported, is not displayed on any standard smart meter; calculating it requires comparing your generation meter total against your smart meter export figure.
• Adding battery storage typically reduces both the import and export figures shown on your smart meter, which can appear misleading without knowing that stored solar energy moving within the home is invisible to the meter.

Why A Smart Meter Works Differently When You Have Solar Panels

A smart meter in a solar home records grid import and export separately, but it does not directly display how much of your solar generation you are using yourself. In a standard home, electricity flows in one direction only. Once solar panels are installed, your home becomes a two-way meter point: some energy enters from the grid when generation is low, and some surplus solar energy leaves when generation exceeds demand.

The Three Figures That Matter

Three separate figures describe what’s happening with energy in a solar home:

• Import shows the kilowatt-hours (kWh) drawn from the grid. A kilowatt-hour is a unit of energy equivalent to running a kettle roughly ten times.
• Export shows the kWh sent back to the grid as surplus solar.
• Generation shows everything your panels have produced, regardless of whether it was used in the home or exported.

The import and export readings appear on your smart meter. The generation total appears on a separate generation meter, usually located near your solar inverter.

What The Smart Meter Does Not Show

Self-consumption, the share of solar energy your home uses directly, does not appear on any standard smart meter display. You cannot read this figure from a single screen. It must be calculated by subtracting your export total from your generation total. 

This gap is the single most common source of confusion for solar owners reviewing their meter data, and it is why reading these figures in isolation tells only part of the story. For a broader overview of how smart meter and solar panels interact, including tariff considerations, see our dedicated guide.

SMETS1 vs SMETS2, Why Your Meter Generation Matters For Solar

SMETS1 meters often cannot transmit half-hourly export data to the grid network, meaning some suppliers estimate rather than measure export when calculating SEG payments. The two generations of UK smart meter behave differently for solar owners, and this difference has a direct bearing on whether your export payments reflect your actual generation.

The table below summarises the key differences between SMETS1 and SMETS2..

SMETS1 meters were widely installed before the DCC network rollout reached completion, broadly before 2019, though dates varied by supplier and region. Because they weren’t required to transmit half-hourly export data in a standardised format, many suppliers fall back on deemed export figures for SEG purposes:

• Deemed export means a fixed percentage of your generation total is assumed to have been exported, rather than using a measured figure.
• Under the older Feed-in Tariff (FiT) scheme, this was typically set at 50% of generation.
• SEG rates and deemed percentages are agreed separately with each supplier, so the figure in your tariff agreement may differ.

SMETS2 meters connect directly to the DCC and can transmit half-hourly import and export data automatically, enabling suppliers to pay on actual measured export. Some SMETS1 meters were subsequently retrofitted or enrolled into the DCC network, so the boundary isn’t absolute, checking with your electricity supplier confirms which basis your payments use.

The Smart Export Guarantee framework sets out supplier obligations for paying export tariffs, and our guide on how UK homes get paid for solar exports covers the SEG in more detail.

How To Read Your Smart Meter Display Step By Step

Reading your smart meter display involves cycling through screens using the A button (or equivalent on your model) to locate the import and export figures stored as cumulative kWh totals. The meter display and the IHD (in-home display), the small wireless unit often placed on a kitchen worktop, serve different purposes. The meter holds the official cumulative data. The IHD shows real-time flow and indicative figures that may differ from what is used for billing.

Reading Your Import Figure

Press the A button on your meter to cycle through the display screens until you see a screen labelled IMP or Import. The figure shown is a cumulative kilowatt-hour total representing all electricity your home has drawn from the grid since the meter was installed or last reset. This is not a daily or monthly figure on its own. 

To calculate consumption over a specific period, note the reading at the start and end of that period and subtract the earlier figure from the later one.

Reading Your Export Figure

Continue cycling through the screens to find a screen labelled EXP or Export. This cumulative figure shows the total kWh your home has sent back to the grid as surplus solar energy. On SMETS1 meters, this screen may not be present, or the figure may not be automatically transmitted to your electricity supplier for billing purposes. 

If you cannot locate an export screen, contacting your supplier will confirm whether your meter supports export metering and what basis is used for your SEG payments.

Reading Your Generation Meter

The generation meter is a physically separate device from your smart meter, typically mounted near your solar inverter, often in the loft, a utility cupboard, or on an external wall. It displays a cumulative kWh total representing everything your solar panels have generated, regardless of whether that energy was used in the home or exported. 

Note this figure alongside your import and export readings. The generation meter reading is not visible on your smart meter display or IHD.

How To Calculate What Your Solar System Is Actually Doing

Self-consumption is the most financially meaningful figure for a solar homeowner, and it doesn’t appear on any standard meter. Here’s how to work it out:

1. Take your generation meter reading (total kWh produced over a period, say twelve months).
2. Take your smart meter export reading (total kWh sent back to the grid over the same period).
3. Subtract export from generation. The result is your self-consumption.

For example: if your generation meter shows 3,000kWh produced and your smart meter shows 900kWh exported, approximately 2,100kWh was self-consumed by your home directly.

To estimate the bill saving from that self-consumption, multiply the figure by your unit rate:

• The Ofgem price cap sets the maximum standard unit rate, your actual tariff may sit below this.
• At an illustrative rate of 24 to 26p per kWh, 2,100kWh of self-consumed solar represents roughly £504–£546 in avoided electricity purchases over the year.

This is only an approximation. It assumes your household was using electricity at the same time the panels were generating it. When consumption and generation don’t coincide, self-consumption falls and more energy is exported at the lower SEG rate instead. Battery storage addresses this timing gap directly, our page on whether adding storage makes sense for your home covers this in more detail.

How Battery Storage Changes What Your Smart Meter Shows

Adding a battery to a solar system will typically reduce both the import and export figures shown on your smart meter, and this can look alarming at first glance if you don’t know why it’s happening.

• Lower export is logical: surplus solar is being stored rather than sent to the grid.
• Lower import happens because the battery is supplying power at night that would otherwise have come from the grid.
• Both changes are signs the system is retaining more value, not performing less well, you’re simply using more of what you generate instead of exporting it cheaply and buying it back at a higher rate later.

The reason both figures drop comes down to where the smart meter actually measures energy flow: only at the grid connection point, the boundary between your home and the wider network.

• Energy that charges the battery from solar and then discharges into the home later produces no import or export reading at all.
• That entire cycle happens within the home boundary and is invisible to the meter.
• A battery charging through the day and powering your home overnight generates no meter movement during either phase of that process, even though real, useful energy is moving around your system the whole time.

If your export and import figures both drop sharply after a battery is installed, that’s expected behaviour, not a fault. The battery is doing its job precisely by keeping energy inside the home rather than sending it back and forth across the meter.

How To Verify Your SEG Payments Using Your Meter Readings

Under the Smart Export Guarantee, licensed electricity suppliers are obligated to pay for exported electricity. Verifying whether your payments are accurate is a straightforward manual process for SMETS2 owners, and a useful check even for SMETS1 owners receiving metered rather than deemed export payments.

How to check:

1. Note your cumulative export reading at the start of a billing period, and again at the end.
2. Subtract the earlier figure from the later one, that difference in kWh is your measured export for the period.
3. Multiply this by the SEG rate stated in your tariff agreement.
4. Compare the result to the payment you actually received.

If the totals don’t match, contact your electricity supplier and ask whether the payment was calculated using metered export data or a deemed figure. A discrepancy doesn’t automatically indicate an error, deemed export is a legitimate contractual method, particularly for SMETS1 owners, but knowing which applies to you matters for understanding whether switching to metered export would be more favourable.

If a discrepancy persists and can’t be explained by deemed versus metered export, raise it with your supplier first. If they can’t resolve it, the correct escalation route is the Energy Ombudsman, not Ofgem directly, Ofgem sets the regulatory framework but doesn’t handle individual billing disputes.

Common Misreadings Solar Homeowners Make

Confusing The Generation Meter With The Import Meter

The generation meter and the smart meter are separate physical devices showing entirely different figures. A high generation meter reading alongside a high import reading does not mean the solar system is failing. It may simply mean generation is not occurring at the same times as demand, so the home is drawing from the grid in the mornings and evenings while exporting during the middle of the day.

Assuming Low Import Means High Savings

A low import figure confirms the home drew less from the grid, but it does not confirm where the substitute energy came from. If a battery charged overnight on a cheap time-of-use tariff supplied the home through the day, the saving calculation differs from solar self-consumption. The import figure alone does not distinguish between these two sources.

Treating The IHD Export Figure As A Billing Record

The IHD (in-home display) is an indicative display, not a billing instrument. Its export figure may not reflect the half-hourly data your meter is transmitting to your supplier. If the IHD shows zero export on a clearly sunny day, this more often indicates a communication gap between the meter and the IHD unit than a problem with the solar system. The meter display itself is the more reliable source for cumulative figures.

Reading Meter Data Out Of Season

UK solar generation varies significantly by month. A comparison between an October reading and a December reading will show a material drop in generation, and this is entirely normal given reduced daylight hours and lower sun angles in winter. For context on what to expect at different times of year, our guide to how solar generation varies through the year sets out typical monthly output patterns.

How Upvolt’s Skygate® Simplifies Smart Meter Data For Solar Homes

The manual reconciliation process described throughout this article is what the Skygate® home energy management system replaces. Reading three separate devices, performing subtraction calculations, and cross-referencing supplier billing against cumulative meter totals are all tasks that take time and leave room for error.

Unified Energy Dashboard

Skygate® pulls generation, import, export, and battery data into one view, removing the need to read the smart meter, the generation meter, and a solar inverter app separately. All figures update in real time and are held historically, so comparisons across billing periods are available without manual note-taking.

Real-Time Self-Consumption Visibility

Because Skygate® receives both generation and import data simultaneously, it can calculate and display actual self-consumption in real time. This is the figure that no standard meter shows directly, and it is the figure that most accurately represents the financial return your solar system is delivering day to day.

SEG Payment Cross-Reference

Skygate® records export data in half-hourly intervals, giving you an independent record to compare against what your electricity supplier has billed. For homeowners on a SEG tariff, this means discrepancies between measured export and supplier payments can be identified and queried with specific supporting data, rather than relying on meter readings taken manually at billing period boundaries.

Let’s Recap

A smart meter in a solar home records import and export at the grid boundary, but it doesn’t display self-consumption or reconcile automatically with the generation meter. These are separate instruments serving different purposes, and neither gives you the complete picture alone.

The type of meter installed determines whether export data reaches your supplier as a measured figure or an estimate. SMETS1 owners receiving SEG payments should ask their supplier whether those payments are metered or deemed, the answer has a direct bearing on payment accuracy.

Self-consumption, the figure that most directly represents your solar panels’ financial value, appears on no standard meter display. It’s calculated by subtracting your export total from your generation total, then multiplying by your unit rate, a more meaningful benchmark than either figure read alone.

For homeowners who want that visibility automatically, a home energy management system integrating generation, import, export, and battery data into one platform removes the reconciliation problem entirely. That capability is already available.

About Upvolt

Upvolt is a renewable energy installer serving homeowners across southern England, specialising in solar panel installation, battery storage, and integrated home energy management. For solar homeowners trying to understand what their system is actually doing, Upvolt brings the technical expertise to make that practical, not just at the point of installation, but in helping homeowners interpret their system data and act on it.

Upvolt’s Skygate® home energy management system addresses the data visibility problem this article describes, replacing manual meter reading and calculation with a single real-time dashboard covering generation, import, export, battery, EV, and heat pump in one view. Upvolt’s MCS-certified operating companies install systems to the standards required for SEG eligibility, ensuring export metering is configured correctly from the outset.

Not sure whether your system is actually saving what it should? Get a free, no-obligation quote and Upvolt will check your meter data, generation, export, and self-consumption, against your setup to see if there’s more savings on the table.

FAQ

Can A Smart Meter Read Solar Panel Generation And Export?

A standard smart meter records what your home imports from the grid and what it exports back, but it does not record solar generation directly. Generation is measured by a separate device, the generation meter, typically installed near your solar inverter. The two meters serve different purposes and must be read separately. Neither one alone gives you a complete picture of your system’s performance.

How Do I Find My Export Reading On A Smart Meter?

Cycling through the display screens using the A button will bring up a screen labelled “EXP” or “Export” showing a cumulative kWh total. On SMETS1 meters, this screen may not be present or the figure may not be transmitted automatically to your supplier. If you cannot locate an export reading, contacting your supplier confirms whether your meter supports export metering and whether your SEG payments are based on metered or estimated figures.

Why Does My In-Home Display Show Zero Export On A Sunny Day?

An IHD showing zero export during periods of good solar generation usually indicates a communication gap between the smart meter and the display unit rather than a problem with the solar system. The IHD receives data wirelessly, and this connection can drop without affecting the meter itself. Reading the meter display directly gives a more reliable cumulative export figure during suspected communication gaps.

Does Adding A Battery Change What My Smart Meter Shows?

Yes. A battery stores surplus solar generation for later use rather than sending it to the grid, so adding a battery will typically reduce both your export figure and your import figure. Energy that charges the battery from solar and then discharges into the home is entirely invisible to the smart meter, because it never crosses the grid connection point. Lower readings on both figures generally indicate the system is retaining more value, not performing worse.

How Do I Know If My SEG Payments Are Correct?

Note your cumulative export reading at the start and end of a billing period and calculate the difference in kWh. Multiply this by the SEG rate in your tariff agreement and compare the result to the payment received. If the figures do not match, ask your supplier whether the payment was based on metered export or a deemed estimate. SMETS2 owners are more likely to receive metered payments. If the discrepancy cannot be explained, the Energy Ombudsman is the appropriate escalation route.

Alex Lomax

CEO & Co-Founder

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