Intelligently Connecting Solar Carports, Storage Systems, and Electric Cars

Photovoltaics no longer need to be limited to traditional rooftops. A carport, a garden shed, a patio canopy, or other surfaces that are already paved or in use can generate additional solar energy—without taking up any new land. This concept becomes particularly interesting when multiple components are not operated in isolation: The existing photovoltaic system on the home, an additional PV carport, an energy storage system, and the electric car can all be connected to form a single integrated energy system.

What matters most here is not so much the number of solar panels as the intelligent management of the energy generated and consumed. An energy management system can determine whether solar power is used in the home at that moment, stored in a battery, used to charge an electric car, or fed into the public grid.

That is precisely where the potential of modern energy systems lies: not only generating electricity ourselves, but also using it as efficiently as possible at the right time and in the right place.

Make use of additional PV space instead of letting unused potential go to waste.

The roof of a house is often the starting point for a residential solar power system. But it is by no means the only suitable surface.

Additional options include, for example:
• Carports and parking canopies
• Garden sheds & greenhouses
• Outbuildings
• Garages
• Fences
• Patio covers & pergolas
• Facades
• Storage and utility buildings

A PV carport serves two purposes at once: It protects vehicles from the sun, rain, snow, and the elements, while also functioning as a small solar power plant. This is particularly useful when paired with an electric car. The vehicle is often parked right where the electricity is generated. A wallbox can automatically use excess solar power to charge the vehicle. This turns a simple parking space into an active part of the energy supply.

Can a solar carport be connected to an existing home solar system?

Generally speaking, yes. An existing solar power system on a residential building does not need to be replaced simply because a solar carport or additional solar panels are added later. In many cases, existing systems can be expanded or combined with an additional system.

Technically, there are various ways to do this.

Option 1: Existing and new PV systems operate together on the AC side

In a commonly used solution, for example, the existing home PV system has its own inverter, and the new PV carport is also equipped with an inverter.
Both feed into the home’s electrical system on the AC side.

To put it simply:

• Home PV → Inverter → Home Electrical System
• PV carport → inverter → home electrical system
• Home electrical system → Appliances / Storage / Wallbox / Power grid

At the grid connection point, the system then records how much electricity the entire building draws from or feeds into the public grid.

The big advantage: The existing system can often remain largely unchanged.

A higher-level energy management system can also collect the production data from both inverters and use it to calculate total PV production.

Option 2: Expansion using an existing inverter

Under certain conditions, additional modules can also be connected to an existing or hybrid inverter.

However, this only works if, among other things:

• there is sufficient inverter capacity,
• additional MPP trackers are available,
• voltage and current are within the permissible ranges,
• the module arrays and shading conditions are technically compatible.

When roof orientations vary significantly—for example, a south-facing roof on a residential building and an east-west orientation on a carport—separate MPP trackers or dedicated inverters are often the more technically sound solution.

Option 3: Separate hybrid inverter with storage

Another option is to equip the new PV carport with a hybrid inverter and, if necessary, a battery storage system. However, it is important to carefully verify whether the storage system can actually accommodate the surplus from all PV systems or whether it only accounts for the modules connected to its own inverter. For retrofits, an AC-coupled storage system may therefore be a viable option. Such a system can determine, based on measurements at the utility connection point, whether there is an overall surplus of PV power—regardless of which inverter is producing that power.

A shared meter does not automatically mean just a solar power system

A common misconception concerns current measurement.

Multiple PV arrays or inverters can constitute technically separate systems and still be operated at the same grid connection point.

The utility’s bidirectional meter primarily measures:

How much electricity is drawn from the public grid?
And how much electricity is fed into the public grid?

Internal measurement data is also required for intelligent energy management. Smart meters, energy meters, or data from inverters are used for this purpose, for example.

This allows the energy management system to see, for example:

Residential PV system generates 4.0 kW
PV Carport Generates 3.5 kW
Household requires 1.5 kW
The Wallbox charges at 4.0 kW
The battery draws 2.0 kW

This means the system not only monitors the flow of electricity to the public grid, but can also control the flow of energy within the building.

Important: If a carport or outbuilding is connected to a separate utility connection or metering point, the situation is different. In that case, the systems cannot simply be treated as part of a shared residential electrical system. In this scenario, the metering plan, utility connection, and—if applicable—local energy communities or self-consumption models must be reviewed.

Why an Energy Management System Is Essential

The more electrical components there are in a building, the more important it becomes to coordinate them.

A typical modern setup, for example, consists of:

• A solar panel system on the house
• An additional solar panel system on the carport
• Battery storage
• A wallbox
• An electric car
• A heat pump
• A hot water tank

Without a central control system, each component operates largely on its own.

A Home Energy Management System—HEMS or EMS for short—takes the entire energy system into account.
For example, it can detect that 8 kW of solar power is currently being generated, while the household only needs 1.5 kW. Instead of feeding the remaining 6.5 kW into the power grid immediately, flexibly controllable appliances can be activated.

Load Management: Targeted Distribution of Solar Power

One possible prioritization could be, for example:

1. Meet current household consumption,
2. Build up the necessary storage reserve,
3. Charge the electric car with surplus PV power,
4. Smartly control hot water or heat pump,
5. Charge the battery based on the situation,
6. Feed any remaining surplus into the grid.

However, the ideal order isn’t always the same.

For example, if it’s known that strong sunlight is expected in the afternoon, it may make sense to deliberately keep part of the battery capacity available. This allows the storage system to absorb a high PV peak later on.
If, on the other hand, the electric car needs to be ready for a long drive at 4 p.m., the energy management system can prioritize its charging process.

Smart energy management therefore relies not only on current measurement data, but increasingly on forecasts and rules as well.

Storing Excess Solar Power: Using the Electric Car as a Flexible Consumer

An electric car is one of the largest flexibly controllable energy consumers in a private household. That’s exactly why it pairs so well with a solar power system. With a simple wallbox, for example, the car charges at 11 kW regardless of the current PV output. If the solar system is producing only 4 kW of surplus power at that time, the remaining 7 kW must be drawn from the grid.

A smart wallbox, on the other hand, can adjust its charging power to match the available surplus solar power. If the energy system produces more electricity, the charging power increases. If clouds roll in or household consumption increases, it decreases again. As a result, a significantly larger portion of the vehicle’s electricity can come directly from the homeowner’s own PV system. This is particularly interesting for PV carports: generation and consumption take place right at the same location.

Energy storage and electric cars aren't in competition—if they're managed properly

A common question is: Should excess solar power be fed first into the home battery or into the electric car?
There is no one-size-fits-all answer to that.

Suppose the battery is already fully charged by mid-morning. At noon, however, the solar array produces its maximum output. At the same time, the electric car is sitting idle in the carport. Without smart planning, valuable storage capacity was used up too early. A modern energy management system can instead take into account weather forecasts, past consumption, charge levels, and scheduled departure times.

This can lead to the following strategy, for example:
• Morning: Power the household and charge the electric car slowly.
• Noon: Use high PV output for the vehicle and battery storage.
• Evening: Power the household from the battery storage.
• Night: Draw as little grid power as possible.

The goal, therefore, is not to charge the battery to 100 percent as quickly as possible, but to optimize self-consumption, grid load, and energy costs throughout the day.

Peak Shaving: Avoiding Power Peaks

Load management can offer yet another benefit: it can reduce power spikes.

For example, if the following are all active at the same time:
• an electric car is charging at 11 kW,
• the heat pump is running,
• a battery storage system is charging from the grid,
• and other household appliances are in use,
this can result in a significant amount of power being drawn from the grid.

Energy management can prevent such situations. For example, the wallbox can temporarily reduce its output, or the battery storage system can support the household.
This process, known as “peak shaving,” is becoming increasingly important as buildings become more electrified.

Intelligently Incorporating Dynamic Electricity Rates

The next step in development involves taking into account not only PV production and consumption, but also electricity prices. If the electricity price is very low at night, an energy management system could, for example, decide to charge the storage system or electric vehicle partially from the grid—provided this makes economic and tariff-related sense. If prices rise again later, the system will prioritize using its own solar or battery-stored electricity. As a result, the role of an energy storage system is increasingly shifting from purely optimizing self-consumption to flexible energy management.

Germany: Grid-oriented control makes EMS particularly attractive

In Germany, Section 14a of the Energy Industry Act also plays an important role.

New controllable consumption devices with a grid connection capacity exceeding 4.2 kW—including, in particular, residential wallboxes, heat pumps, and energy storage systems with regard to their grid consumption—are generally subject to the relevant regulations.
In the event of impending local grid congestion, the grid operator may limit the grid consumption of these controllable devices. In return, operators receive reduced grid fees. Normal household consumption remains unaffected.

An energy management system can be particularly beneficial when there are multiple consumers: The grid operator specifies a permissible power draw, while the EMS determines internally how that power is distributed—for example, among the wallbox, storage unit, and heat pump.

This is particularly relevant for households with PV systems: The electricity generated by the home’s own PV system is not treated the same way as electricity purchased from the grid. A wallbox can therefore receive more power when additional energy comes directly from the home’s own PV system.

Since April 2025, Germany has also offered the option of time-variable grid fees under what is known as Module 3 in combination with Module 1. This allows consumers to shift their loads more significantly to grid-friendly time slots.

Grants for Photovoltaics, Energy Storage, and Energy Management

Grants in Austria in 2026

Austria is particularly attractive for the expansion of existing PV systems in 2026.

The following subsidy rates apply for the EAG investment subsidy in 2026:
• up to 10 kWp: 150 euros/kWp
• from 10 to 20 kWp: 140 euros/kWp
• from 20 to 100 kWp: maximum 130 euros/kWp
• over 100 kWp: maximum 120 euros/kWp
• Battery storage: 150 euros/kWh

A maximum of 30 percent of the eligible investment costs is funded.

A battery storage system is eligible for funding only in conjunction with a newly proposed PV system or a PV expansion. A storage expansion on its own is not eligible for funding. A minimum storage capacity of 0.5 kWh per kWp of applied-for PV capacity is required; a maximum of 50 kWh of storage is funded. This means, for example, that expanding an existing residential PV system with an additional PV carport could be a particularly attractive option.

Of particular relevance: Funding for energy management

In addition, the “Energy Management – Flexibility in the Distribution Network for Households” incentive program has been in effect in Austria since June 23, 2026.

Funding is provided for automated energy management systems with communication capabilities that include at least two components such as

Solar power system,
Battery storage,
Wallbox,
Heat pump or electric water heating

actively manage together. As of now, the call for proposals for private households will remain open until April 15, 2027, or until the relevant funding is exhausted.

This incentive is therefore particularly relevant for a system consisting of a PV carport, a residential PV system, a storage unit, and an electric car.

The Austrian federal subsidy program “E-Mobility for Private Individuals 2025,” which provided funding for wall boxes, among other things, has already closed to new applications. Existing registered subsidy applications can still be processed.

In addition, you should always check for state, municipal, and utility company subsidies.

Sources:
https://www.eag-abwicklungsstelle.at/wissen/investitionszuschuss-photovoltaik-und-speicher/
https://www.klimafonds.gv.at/foerderung/energiemanagement-haushalte-2026/

Funding and Framework Conditions in Germany in 2026

Germany is placing greater emphasis on feed-in tariffs, tax breaks, and promotional loans for photovoltaic systems. For rooftop systems that become operational between August 1, 2026, and January 31, 2027, the EEG feed-in tariff for partial feed-in currently amounts to 7.70 cents/kWh for the portion of capacity up to 10 kW, for example. Higher feed-in rates apply to full-feed-in systems.

The KfW Renewable Energy Program – Standard 270 can be used to finance, among other things, the installation and expansion of photovoltaic systems as well as battery storage systems. The program is open to individuals, businesses, and public institutions.

Another factor that remains relevant for private PV projects is the zero VAT rate for eligible photovoltaic systems. Under certain conditions, this rate may apply not only to modules and inverters but also to battery storage systems and essential components. However, an important distinction applies to solar carports: While the PV components may qualify for the tax exemption, the actual load-bearing carport substructure does not automatically qualify.

The former KfW subsidy program 442, “Solar Power for Electric Cars,” which combined a PV system, storage, and a wallbox, is no longer open to new applications. In addition, there are numerous subsidy programs offered by individual federal states, municipalities, and energy providers. New PV systems and storage units must also be registered in the Market Master Data Registry, among other places, in accordance with current regulations.

In addition, you should always look into state and local funding options in Germany, because subsidies for energy storage systems, wall boxes, or solar panels can vary significantly from region to region.

Sources:
https://www.kfw.de/inlandsfoerderung/Privatpersonen/Neubau/F%C3%B6rderprodukte/Erneuerbare-Energien-%28270%29/
https://www.bundesnetzagentur.de/DE/Specialized Topics/Electricity and Gas/Renewable Energy/start.html

Grants in Switzerland in 2026

In Switzerland, photovoltaic systems are supported primarily through the federal government’s one-time subsidy (EIV). In addition, cantonal and municipal incentive programs are relevant, particularly for storage systems and charging infrastructure, as these are not uniformly supported through Pronovo.

For systems under 100 kW, the KLEIV—the one-time payment for small photovoltaic systems—is generally available. For systems of 100 kW or more, other incentive programs apply.

Important for existing systems: You can also apply for a grant to expand an existing PV system. Pronovo explicitly provides for procedures for system expansions.

Also of interest are special incentive components, such as those for specific system designs. For example, the current Pronovo rate calculator takes into account not only the base and performance fees but also potential bonuses for systems with steep slopes, high altitudes, or parking areas.

Unlike photovoltaic modules, battery storage systems are not eligible for a one-time, nationwide PV feed-in tariff. However, individual cantons and municipalities offer storage subsidies or other local programs. The Federal Office of Energy explicitly points out these cantonal subsidy options.

Since January 1, 2026, the regulatory framework for the local use of solar power has also evolved. Among other things, new models make it easier to consume solar power locally or share it with others. These include, for example, virtual groups for self-consumption.

This makes the smart, local use of solar power even more important.

Sources:
https://pronovo.ch/de/foerderung/photovoltaik/
https://pronovo.ch/de/foerderung/photovoltaik/gesuch-stellen/

Expanding an Existing PV System: What to Consider Before Implementation

Anyone who, for example, adds a PV carport to an existing residential PV system should therefore not base their project planning solely on the available module area.
The technical planning should include at least the following points:

1. Analyze the existing system
: Record the system’s capacity, age, inverters, metering configuration, and existing interfaces.

2. Evaluate additional PV areas
Check orientation, shading, structural requirements, and cable routes.

3. Check the grid connection
The additional generation capacity and, if applicable, charging capacity must be coordinated with the requirements of the relevant grid operator.

4. Define the metering concept
If the entire system is to be operated behind a common grid connection point, the electrical integration must be planned accordingly.

5. Determine the storage strategy
It’s not just capacity that matters. It’s also crucial that the storage system be able to accept energy from all available PV generators.

6. Integrate the wallbox
To maximize the proportion of solar charging, the wallbox should be able to communicate with the energy management system or its metering system.

7. Consider Open Interfaces
When selecting a system, care should be taken to ensure that the inverter, storage system, and charging infrastructure can communicate with one another. Cross-manufacturer systems are technically more challenging than fully integrated ecosystems.

8. Check for grants before placing an order
Many grant programs have deadlines or requirements regarding applications, orders, and commissioning. You should therefore always check for grants before starting a project.

From a Solar Carport to a Smart Energy System

The future of photovoltaics does not lie solely in installing more and more solar modules. It is becoming increasingly crucial to intelligently integrate generation, storage, and consumption.

A solar carport can be much more than just additional space for solar panels. When combined with an existing solar power system on the home, a battery storage system, a smart wallbox, and an energy management system, it creates an integrated energy system.

Solar power is used where it is most beneficial:
• in the home,
• in battery storage,
• in the heat pump,
• or directly in an electric car.

In this way, areas already in use can make an additional contribution to the energy supply, self-consumption increases, and electricity purchases from the public grid can be reduced.

The crucial step, therefore, is not the question“Where else can we install solar panels?” but rather:
“How can we create a unified smart energy system out of all available generators, storage systems, and consumers?”
That is precisely where the potential of modern PV carports and networked energy solutions lies.

Note: Funding programs, reimbursement rates, and legal frameworks are subject to change at short notice. The information provided is current as of September 2026. Before making an investment decision, you should review the current terms and conditions of the relevant funding agency and the respective grid operator.