The integration of wallbox, PV system, and home automation systems creates a smart energy ecosystem capable of optimizing self-consumption, reducing costs, and increasing grid independence.
A home equipped with solar panels, a connected wallbox, and an energy management system can coordinate production, storage, and consumption automatically, maximizing the use of self-generated energy and minimizing withdrawals from the grid.
In this article we explore how to integrate wallbox and PV, what are the benefits of home automation, and how to design an efficient and scalable energy ecosystem.
Why integrate wallbox and photovoltaics?
A home photovoltaic system produces energy during the middle hours of the day, when the sun is most intense. Using this energy to recharge your electric car allows you to maximize your self-consumption , drastically reduce charging costs and increase the energy independence of the home.
Without integration, EV charging takes energy from the home system, then goes to consumption, and ends up counting on the electricity bill. With a smart wallbox, the process is fully automated: the wallbox detects PV production and adjusts charging accordingly.
How does wallbox-photovoltaic integration work?
The integration between wallbox and PV is based on a monitoring system that detects solar production and household consumption in real time. This data is transmitted to the wallbox, which automatically adjusts the charging power and chooses if and when it is most convenient for you to charge with the energy produced by your PV system. Trivially, if you put your car on charge in the middle of the day, the wallbox will prioritize energy from PV instead of taking it from your home system.
When PV production is high and household consumption is low, the wallbox increases PV charging power, making maximum use of available energy. When production drops or household consumption increases, the wallbox reduces power or temporarily suspends charging. This system ensures that the self-generated energy is prioritized for vehicle charging, reducing grid withdrawals and maximizing savings.
Photovoltaic charging mode
PV-compatible wallboxes generally offer three charging modes.
Solar only: the wallbox uses photovoltaic power exclusively. If there is insufficient production, charging does not start or proceeds at reduced power. This mode maximizes self-consumption.
Solar + grid: the wallbox prioritizes solar power, but draws the energy needed to complete charging from the grid. This mode balances self-consumption and charging speed.
Network: the wallbox ignores PV and draws power from the grid. Useful for quick or nighttime recharges when the PV is not producing or you do not have a system to store the energy produced by the system .
Storage systems
Household batteries store the photovoltaic energy produced during the day and make it available in the evening and night hours. The integration of wallbox, photovoltaics, and batteries creates a complete energy system: during the day, the photovoltaics power household consumption, recharge the battery, and power the wallbox. In the evening, the battery provides energy for household consumption and, if configured correctly, can also power the wallbox. This system allows the car to be recharged almost exclusively with self-generated energy, even when the sun is not available.
Configuration of energy priorities
In a system with photovoltaics, batteries, and wallboxes, it is critical to define energy priorities:
- priority household consumption (refrigerator, lighting, essential household appliances);
- home battery charging;
- electric vehicle charging;
- Feeding the residual energy into the grid.
This hierarchy ensures that essential consumption is always covered, the battery is charged for evening use, and the car is recharged only when power is available.
Energy flow monitoring and analysis
An integrated ecosystem provides comprehensive visibility into household energy flows: instantaneous PV production, energy stored in batteries, household consumption by type, energy destined for the wallbox, energy fed into the grid, and energy withdrawn from the grid. This data enables analysis of system efficiency, identification of waste, and optimization of configurations to maximize self-consumption and savings.
Dynamic tariffs and energy sales
In some European countries (and Italy is no exception), dynamic electricity tariffs, which vary according to hourly grid demand, can be chosen. Integrated systems can take advantage of these variations to optimize costs by charging at the lowest-cost hours.
Scalability of the system
A home energy ecosystem must be designed to grow over time. Initially, a user may install only photovoltaics and wallboxes. Later, he or she can add storage batteries, heat pumps, or other smart devices.
Some practical examples of integration
Scenario 1: house with photovoltaics without batteries
A home with a 6 kW PV system installs a 7.4 kW PV-compatible wallbox. During the day, when the homeowner is working from home, the wallbox senses solar production and charges the car at variable power, using excess energy.
Estimated savings: 70-80% of charging cost compared to using the grid.
Scenario 2: house with photovoltaic and 10 kWh battery
A home with 8 kW PV and 10 kWh battery installs a smart wallbox. In the daytime, the PV powers consumption, charges the battery, and recharges the car. In the evening, the battery powers household consumption. At night, if necessary, the car recharges with energy from the battery or the grid at the night rate.
Estimated savings: up to 90-95% of charging cost compared to using the grid.
Silla’s solutions for energy integration
Wallboxes Prism Solar from Silla Industries are designed to integrate seamlessly with PV systems and home energy management systems. Prism supports the OCPP protocol, ensuring interoperability with third-party management platforms, and includes native functions for charging from PV with configurable modes (solar only, solar + grid, grid).
The system of Dynamic Load Management integrated enables coordination of wallbox, PV and household consumption, optimizing self-consumption without the need for additional hardware.
Prism is compatible with leading PV inverters and home storage systems, enabling the creation of complete and scalable energy ecosystems.
Do you want to create a smart energy ecosystem?
Contact us, also via chat for dedicated advice: we help you design the integration of wallbox, PV and home automation to maximize self-consumption, savings and energy independence.
