DNO Notification for EV Chargers, Heat Pumps and Plug-In Solar
- Home Electrification and Growing DNO Connection Requirements
- DNO Notification Scenarios for EV Chargers and Heat Pumps
- Plug-In Solar Alongside EV Charging, Heating and Home Energy Use
- Home Energy Options for Plug-In Solar and Wider Electrification
- Practical Checks Before Adding New Home Energy Technologies
- Conclusion
- FAQs
As more electric vehicle charging, heat pumps, solar generation, and battery storage technologies are installed in UK homes, homes are becoming increasingly electrified. These upgrades will reduce fossil fuel use and increase homes' energy independence, but they can also affect electricity flow through the home and, in some cases, the local electricity system.
This is where DNO notification for EV chargers and other home energy equipment becomes relevant. A Distribution Network Operator is the company responsible for the local network which supplies a property and may require information regarding some new loads or generating equipment before and/or after installation.
The exact sequence will vary, depending on the type of equipment being installed, the household supply and the total electrical installation. Knowing these requirements early makes it easier to plan EV charging, heating, and plug-in solar upgrades together rather than as separate upgrades. This guide aims to help DNO checks be considered as part of a modern home electrification plan and to identify where solar and battery storage can enable more widespread home energy use.
Home Electrification and Growing DNO Connection Requirements
Home electrification isn't typically about a single device anymore. This can start with a home EV charger, then a gas boiler-to-heat-pump conversion, and then a solar energy system or battery storage. Each upgrade will affect the home's electrical profile differently, so it is more helpful to plan upgrades together than to consider them individually.
EV Chargers and Heat Pumps Increasing Household Electricity Demand
EV chargers and heat pumps can both be a big new load on a property. In colder weather, a heat pump can run for extended periods; an EV might draw several kilowatts while charging. While these technologies can be handled on their own, together they can drive higher continuous demand than the home was built to withstand.
This is where DNO notification for EV chargers and heat pumps can help. Installers may need to check the property supply, main fuse, and likely maximum demand before connecting. Load management is one solution that can be employed in some instances to avoid excessive high power apparatuses drawing energy simultaneously.
Plug-In Solar Adding Local Generation to an Electrified Home Setup
Plug-in solar changes the approach in another way. It's not a large electrical load, but it's a local electricity source that can help supply some of the electricity the house uses during the day.
This is helpful when a home has an EV charger or Heat Pump as some of the power needed by these devices may be supplied by solar power rather than the grid. The real value is dependent on the timing. For instance, an EV charged at night will not get much help from the sun during the day unless it also has a battery storage system.
The key is that plug-in solar, EV charging and electric heating impact the same home energy system in different ways. It's easier to understand both demand and generation by looking at them together before adding further upgrades.
DNO Checks as One Part of Planning Modern Household Upgrades
DNO notification involvement isn't something that happens at the end of the planning process, like paperwork. Installers might have to certify the household supply capacity, existing electrical equipment or determine whether the planned technologies are compatible.
This is particularly helpful for houses that have been upgraded over the years. If a later addition of a heat pump, solar generation or battery is added to a property that already has an EV charger, a re-assessment of the property may be required.
Early planning of the entire energy system can minimize the risk for redundant work and unforeseen connection problems. The next step is an in-depth review of EV charger and heat pump-specific DNO notification scenarios, as requirements may vary by equipment type and household supply.
DNO Notification Scenarios for EV Chargers and Heat Pumps
While both EV chargers and heat pumps are high-demand electrical technologies, the DNO process differs from home to home. The real question is whether the existing supply can safely handle the new equipment without any network changes. UK guidance distinguishes between installations that can be installed first and notified afterwards and those that require approval before installation.
EV Charger Installations That May Require Local DNO Notification
When an EV charger is installed, it becomes a new electrical load that may be in use for several hours a day. The installer should therefore evaluate the property supply before connecting the charger and determine whether the local DNO should be contacted before or after installation.
The charger could be installed on a 'connect and notify' basis, where the installer provides the relevant details to the DNO once it is installed. Other cases may require an apply-to-connect first, where network considerations affect the existing supply, the maximum demand, and/or the proposed equipment. Official guidance also directs authorised EV chargepoint installers to report installations to the relevant DNO.
Thus the homeowner is not left to make the decision on his/her own. A skilled installer should be able to determine the electricity supply and make the necessary DNO notification for an EV charger.
Heat Pump Installations and Relevant DNO Notification Requirements
Heat pumps also create a significant electrical load, particularly in colder weather when demand for heat is highest. They have an impact on the network based on equipment rating, property loads and other devices that are already operating in the home.
As with EV chargers, installers will run the relevant ENA process to determine whether a heat pump can be installed and then notify the DNO or obtain DNO approval before installation. Government guidance specifically calls out heat pumps as one of the energy devices that should be registered with the local network operator.
This makes it beneficial to have an early assessment for homes looking to change their gas heating to an EV charger (or other high power equipment).
Installer Checks Before High-Power Equipment Is Connected at Home
The installer must consider more than the individual appliance, before either technology is connected. The final decision depends on the existing electrical demand, the main supply, protective equipment, and any other planned upgrades.
For instance, a family planning to install an EV charger and a heat pump in the same year may want both considered. This can help identify if load management, upgrading the supply or another type of connection needs to be tackled first.
After those more sought-after technologies, the next set of questions is: How can plug-in solar power reduce the amount of electricity the home uses during the day, and how can battery storage increase that benefit after dark?
Plug-In Solar Alongside EV Charging, Heating and Home Energy Use
After the EV charging system and electric heating system are both part of the same household, the next question is how much of the extra electricity demand can be supplied more efficiently. Plug-in solar can also help to lower electricity demand during the day, but it's usefulness depends on how electricity is being consumed and how well the generation aligns with the household's consumption habits.
Plug-In Solar Generation Supporting Daytime Household Electricity
Plug-in solar is best suited for households that have already got a certain amount of daytime demand. Appliances, home-office equipment, the refrigerator, and other background loads can use solar electricity as it is produced, reducing the amount imported from the grid.
For a house with electricity, it can also contribute to the power consumption of an EV charger or heat pump during the day. The benefits are generally most pronounced when you use generation right away rather than exporting it unnecessarily.
This makes plug-in solar attractive as an enhancement to the broader energy mix, instead of an alternative to grid electricity. It will vary depending on the output of the panels, weather and the timing of household demand.
EV Charging and Heat Pump Demand Outside Peak Solar Hours
The problem is that EV charging and heating needs don't necessarily coincide with solar power production. An EV can be plugged in at the end of the working day and charged overnight, and heat pumps tend to be used when solar energy is at its weakest (early mornings, evenings and colder winter months).
This can mean daytime generation may not match the times these technologies are in use. Flexible loads can sometimes be scheduled differently to improve the match. For instance, if an EV is at home and the charger can be scheduled, it can be charged during the afternoon when solar energy is available.
This also applies to heating mode, as comfort needs and outdoor temperatures typically place greater restrictions on when a heat pump can operate.
Battery Storage Linking Solar Generation With Later Home Demand
Battery storage helps overcome time mismatches between solar supply and domestic loads. Excess production in the day may be stored and provided for evening load applications, heating demand and other loads during the time when solar production decreases.
That does not imply that a battery should only be designed around an EV charger or heat pump. A more effective way to think about this is to assess the home's entire consumption profile and consider it alongside solar production and typical evening consumption.
In multi-family houses where multiple technologies are being installed over time, it may be easier to manage the combination of plug-in solar power, EV charging, heat pumps and battery storage in a single energy plan and minimise unnecessary grid dependency. What follows is a discussion of possible home energy options for those households taking that path.
Home Energy Options for Plug-In Solar and Wider Electrification
Energy planning is becoming more about how the entire home functions, rather than just one appliance, with the addition of EV charging, electric heating and solar generation. Whether the focus is on daytime power generation, a new solar-and-storage installation or the addition of storage to a solar installation, the right solution exists.
EcoFlow STREAM 5000 for New Solar and Storage Home Installations
Homes planning solar and battery storage have different needs. The EcoFlow STREAM 5000 offers a 5.24kWh battery, can accommodate up to 4,000W of PV, and is ideal for families planning to build a larger solar-and-storage system all at once.
Excess solar energy can be stored for future use rather than relying solely on instant usage. This is especially beneficial when electricity usage extends into the evenings, such as for cooking, entertainment, heating or EV charging.
The advantage is greater flexibility: if a household reduces consumption in some areas, it can use grid electricity to meet demand; if it reduces consumption in other areas, it can use stored electricity to meet demand.
EcoFlow STREAM AC 5000 for Existing Solar Homes Adding Storage
Some households have already installed rooftop solar and then installed an EV charger or heat pump. In that case, it may be more sensible to replace the existing solar installation. The EcoFlow STREAM AC 5000 is geared towards owners with existing solar generation and additional battery storage as a post-installed addition.
It has a capacity of 5.24kWh which can store excess generation that may otherwise be exported to the grid and provide it to the household at a later stage when there is increased demand. This can be very useful if EV charging and/or heating extends beyond peak solar input times.
Practical Checks Before Adding New Home Energy Technologies
Once technologies start sharing the same household supply, good planning matters more than selecting individual products. There are some basic tests that can help homeowners better understand the interplay between EV charging, heating, solar generation and battery storage before they install any additional equipment.
List EV, Heating, Solar and Battery Equipment in One Plan
Beginning by documenting what is in place and what can be added later. Include EV chargers, heat pumps, solar inverters, battery systems and other significant electrical loads. Viewing the entire setup ensures one upgrade isn't planned without accounting for equipment already installed on the property.
Check Household Supply and Likely Combined Electricity Demand
When an EV charger is used with a heat pump, it can create significant demand. Have the installer determine the home supply, main fuse and maximum demand of the house instead of just each appliance.
When there is a high risk of demand reaching levels that are too high load management can help manage when power demanding equipment is used.
Confirm Applicable DNO Requirements With the Installer Early
Where possible, the appropriate DNO notification path must be confirmed prior to work commencing. Some installations may be subject to the connect-and-notify procedure, others require the network operator to examine the proposed connection before it can be made.
Early checks are especially helpful if you plan to install multiple energy technologies over a short period.
Review Plug-In Solar Generation Against Daytime Home Usage
Before determining how much plug-in solar generation will help, estimate your household's actual electricity use. Homes that are heated by the sun during the day, have flexible EV charging, or have remote work can potentially take in more solar power directly.
Battery storage and/or scheduled charging could better match generation and consumption, with most demand later.
Keep Installation and DNO Records After Future System Upgrades
Retain copies of equipment specifications and documents from the installer and any correspondence from the DNO following upgrades. Such records will facilitate the evaluation of changes in the future, especially when a second charger, heat pump, solar system or battery is installed later.
An expanded energy system is easier with a well-documented home energy system, as installers can visualize what is installed in the home instead of starting from scratch to build up the technical picture.
Conclusion
An EV charging station, heat pump or solar generation system adds another dimension to electricity flow in a house, and can be more easily managed if they are considered as one system. Early DNO notification for EV chargers and heat pumps can help installers identify potential supply constraints, registration requirements, and network checks before issues arise.
Meanwhile, plug-in solar can help meet a portion of daytime electricity needs, and battery storage can shift excess electricity to times of day when there is greater demand for heating, appliances, or EV charging.
When considering several updates, the most sensible approach is to assess the current equipment and, with input from the DNO, consider likely future demand. This creates a better opportunity to grow the home energy system without treating each new technology as a stand-alone installation.
FAQs
Can Plug-In Solar Affect an Existing EV Charger DNO Record?
Yes, as plug-in solar is generation and can be paired with other energy equipment on a property that might already be registered. The existing EV charger record may not need to be replaced, but the DNO may require an update to the property's overall electrical installation. The installer should verify the existing records and determine if the new generation needs to be notified or connected.
Does a Second EV Charger Require Another Local DNO Assessment?
The installation of a second charger will potentially add to the maximum electricity demand at the property and it is advisable for the installer to review the electricity supply to the property and existing loads. A second DNO notification for EV chargers may be needed, especially if changes in overall charging demand affect the initial connection assumptions. Sometimes, load management can prevent both chargers from drawing maximum power at the same time.
Can a Heat Pump and EV Charger Share the Same Household Supply?
In many houses, they can, but it depends on the available supply and the requirements of other appliances. Running both a heat pump and an EV charger can create a relatively high load. The installer will need to determine the installation's likely maximum demand and whether load management, a supply change, or a specific DNO assessment is required.
Does Moving Home Affect Existing DNO Records for Energy Equipment?
Yes, DNO records link equipment to the property and electricity supply point where it is installed. When an EV charger, heat pump, or other movable system is installed at a new address, the previous record does not automatically move with the homeowner. There are local DNO requirements for that property and the new installation should be checked against these requirements.
Can Plug-In Solar Be Added After a Heat Pump Has Been Installed?
Yes, you can add plug-in solar; however, the electrical installation and connection requirements must be appropriate. The home energy system needs to account for the existing heat pump's impact on household demand, as well as local solar generation. If battery storage is also to be provided, installers should consider the combined inverter configuration and any additional DNO requirements.