Solar Panels and Smart Meters: Do They Work Together

If you are considering solar panels or already have them installed, you may be wondering how a smart meter fits into the picture. The good news is that solar panels and smart meters work together very well in the UK, and having a smart meter actually unlocks several financial benefits that are not available without one. From accurate export tracking for SEG payments to accessing smart tariffs that can save hundreds per year, a smart meter is an important part of the modern solar home setup. This guide explains everything you need to know.

Do Solar Panels Work with Smart Meters?

Yes, solar panels and smart meters work together, but your smart meter must be correctly configured to track both the electricity you import from the grid and the surplus you export. A SMETS2 smart meter with an export MPAN (Meter Point Administration Number) is required to receive Smart Export Guarantee (SEG) payments for the electricity you send back to the grid, currently worth 3–15p per kWh depending on your tariff.

If you already have a smart meter and then install solar panels, your energy supplier will need to update your meter settings to record export as well as import. This is usually free but can take 2–6 weeks to arrange. Some older SMETS1 meters may not support export metering and will need replacing with a SMETS2 model. Once configured correctly, your smart meter’s in-home display will show your real-time generation, usage and export — helping you shift high-consumption activities to daylight hours and maximise your self-consumption savings.

Do You Need a Smart Meter for Solar Panels?

You do not need a smart meter to install or operate solar panels. Your panels will generate electricity and reduce your grid imports regardless of your meter type. However, a smart meter provides significant advantages that make your solar investment work harder.

Without a smart meter, you have limited visibility into how much you are importing, exporting, and consuming. Your energy supplier may estimate your usage between manual meter readings, which can lead to inaccurate bills. And critically, you may not be able to access the best Smart Export Guarantee (SEG) tariffs, which require a smart meter for export measurement.

How Smart Meters Track Solar Import and Export

A smart meter measures electricity flowing in both directions: into your home from the grid (import) and out from your home to the grid (export). When your solar panels generate more electricity than you are using at any given moment, the surplus flows back through the meter to the grid. The smart meter records this export separately from your import.

This two-way measurement is essential for accurate SEG payments. Under the Smart Export Guarantee, energy suppliers pay you for every kilowatt-hour you export. Current SEG rates range from 4p to 15p per kWh, with the best rates typically requiring a smart meter that provides half-hourly export data.

Without a smart meter, some suppliers estimate your export at 50% of generation (a deemed export figure). This may over or underestimate your actual export depending on your self-consumption habits, and it locks you out of the more generous tariffs that pay based on actual metered export.

SMETS1 vs SMETS2: Which Smart Meter Do You Need?

There are two generations of smart meter in the UK, and the distinction matters for solar panel owners.

SMETS1 (first generation)

SMETS1 meters were installed from 2013 to 2018. They communicate directly with the installing energy supplier rather than through a central network. The main issues with SMETS1 meters and solar panels are:

• They sometimes “go dumb” when you switch energy supplier, losing smart functionality
• Export metering may not be enabled or may not work correctly with solar
• Half-hourly data may not be available, limiting access to time-of-use tariffs
• The in-home display may show confusing readings when solar is generating

Many SMETS1 meters are being migrated to the central DCC (Data Communications Company) network, which gives them SMETS2-like functionality. However, not all have been migrated yet, and some older models cannot be upgraded. If you have a SMETS1 meter and are experiencing issues with solar export tracking, request a SMETS2 upgrade from your energy supplier.

SMETS2 (second generation)

SMETS2 meters have been the standard since 2018 and communicate through the DCC network. They are fully compatible with solar panels and offer:

• Accurate import and export measurement
• Half-hourly data collection for both import and export
• Continued smart functionality when switching energy supplier
• Compatibility with all SEG tariffs and time-of-use tariffs
• In-home display showing real-time import, export, and generation data

If you are getting solar panels installed, request a SMETS2 meter if you do not already have one. Your energy supplier is obligated to offer a smart meter installation free of charge.

How Half-Hourly Data Unlocks Better Tariff Deals

A SMETS2 smart meter records your electricity usage in half-hourly intervals. This granular data is the key to accessing time-of-use tariffs that can dramatically reduce your electricity costs when combined with solar panels and a battery.

Popular time-of-use tariffs for solar households include:

With Octopus Flux, for example, you can charge your battery at 14p per kWh in the early hours, then export to the grid at 22p per kWh during the evening peak, while also using solar generation during the day for free. The profit from this arbitrage can save an additional £200-£500 per year on top of standard solar savings.

Half-hourly settlement data is only available through a smart meter. Without it, you are restricted to flat-rate tariffs that do not reward flexible consumption or strategic export.

Common Problems With Smart Meters and Solar Panels

Export not registering

This is the most common complaint. Some smart meters are not configured to record export when they are first installed. Your energy supplier needs to enable the export register on the meter, which is a remote software change. If your SEG provider cannot see your export data, contact them and ask them to check the meter configuration.

Meter not upgraded to SMETS2

If you have an older SMETS1 meter that is not communicating properly or not tracking export, request a free upgrade to a SMETS2 meter from your energy supplier. You have a right to a smart meter installation, and suppliers have government targets to meet for meter rollouts.

In-home display showing confusing readings

The in-home display can show negative consumption when you are exporting, which confuses some users. This is normal behaviour. The display may also show a running cost that does not account for export income. Most solar owners find the inverter’s own monitoring app (or battery app) more useful for tracking generation and self-consumption than the in-home display.

Meter losing smart functionality after supplier switch

This primarily affects SMETS1 meters. If your meter went dumb after switching supplier, your new supplier should be able to re-enrol it on the DCC network or replace it with a SMETS2 meter. Contact them and explain the situation.

Should You Get a Smart Meter Before or After Solar Installation?

Ideally, have a SMETS2 smart meter installed before your solar panels go in. This ensures export metering is active from day one and you do not miss out on any SEG income during the first weeks of generation. Some solar installers will arrange the smart meter as part of the installation package.

If you already have solar panels without a smart meter, request one from your energy supplier as soon as possible. The installation is free and usually takes about an hour. Once installed, contact your SEG provider to ensure the export register is active and your account is set up to receive actual metered export payments.

To get started with a solar panel installation that includes guidance on smart meters and export tariffs, request a free quote from MCS-certified installers in your area.

Frequently Asked Questions

Will my smart meter show how much my solar panels are generating?

The smart meter itself does not measure generation directly. It measures what flows in and out of your home at the grid connection point. Your solar inverter or battery monitoring app shows generation data. However, by comparing your smart meter import data with your generation data, you can calculate your exact self-consumption and export figures.

Can I get SEG payments without a smart meter?

Some SEG tariffs accept deemed export (estimated at 50% of generation) rather than metered export, which means a smart meter is not strictly required. However, the best-paying SEG tariffs require actual metered export data from a smart meter. You could be leaving money on the table by not having one.

Is it free to get a smart meter installed?

Yes. Under the government’s smart meter rollout programme, your energy supplier must offer smart meter installation at no direct cost to you. The cost is covered through general energy bills across all customers. Contact your supplier to arrange an installation, which typically takes 30-60 minutes.

Do solar panels affect my smart meter readings?

Solar panels reduce your import readings because you are using self-generated electricity instead of buying from the grid. When you are exporting surplus, the meter records this separately. Your energy bills should show both import and export figures. If your bills seem unusually high after solar installation, check that the meter is correctly configured and that export is being recorded.