A home without an energy storage system often struggles with low self-consumption. This is because photovoltaics are most effective around midday, while typical household consumption increases in the morning and evening. During the day, residents are usually away from home, and the main appliances run only briefly or not at all. In the evening, the situation reverses: cooking, laundry, lighting, electronics and heating cause energy demand to rise, while PV production drops to zero.

Low self-consumption is usually not a problem of a poor installation, but rather a mismatch between two profiles: when electricity is produced and when it is needed. As a result, surplus energy appears around midday and is exported to the grid, while later – when the home uses more electricity – energy is drawn from the grid again.

In a home with photovoltaics, degradation is a natural part of battery operation, but in practice it is usually not a problem for the user. Home energy storage systems are designed for many years of use, which is why manufacturers anticipate gradual changes in performance and clearly define them in their warranties.

This means that the battery continues to operate efficiently and predictably for years, while any changes in capacity remain within the range considered normal for modern energy storage systems.

SigenStor is an intelligent, modular energy storage system for homes and small commercial properties. Its greatest advantage lies in the fact that, instead of building an installation from many independent components made by different manufacturers, the user receives one integrated solution that can be expanded as energy needs grow.

The system has been designed as a modular solution. This means that you can start with a smaller configuration and then expand it when a heat pump, air conditioning, an EV charger, or simply higher energy consumption appears in the home. Sigenergy’s official materials emphasize that the system is stackable and scalable, and that the configuration can be tailored to different usage scenarios.

V2L, V2H, and V2G are three names for the same idea: an electric car does not have to be only a consumer of electricity, but can also supply it. The difference lies in where that energy is meant to go and the scale of the overall solution. Below, we present three different technologies worth understanding if you are interested in drawing power from an electric car. The terms V2L, V2H, and V2G refer to the same underlying concept – electricity can flow not only to the car, but also from the car – yet in practice they describe three different use cases.

It is also worth keeping the ISO 15118 standard in mind – this is an international standardization framework that enables the car and the charger to communicate securely (including, among other things, Plug & Charge, intelligent EV charging station management, and preparation for bidirectional charging). From 1 January 2027, stricter regulations resulting from the AFIR Regulation (EU 2023/1804) will begin to apply in the European Union: new and modernized publicly accessible charging points will have to meet interoperability requirements, which in practice means the need to support EN ISO 15118-20:2022 (in accordance with the timeline described in the implementing/delegated acts under AFIR). That is why we are already focusing on equipment prepared for this direction – the Zaptec Go 2 is designed to be ISO 15118-20 ready and V2G-ready, and functions related to this standard are to be activated/developed through updates when the market and operator implementations are ready.

During property modernization, it is easy to focus on the most visible elements, such as a new kitchen, a refreshed bathroom, or impressive flooring – these changes improve first impressions and help with the sale of a property. However, it is worth remembering that aesthetics age quickly, and the new owner will often arrange the interior to their own taste anyway. Functional upgrades are therefore becoming increasingly important, as they have a real impact on everyday comfort: warmth in the home, no dampness or drafts, quietness, stable indoor temperature, and lower, more predictable bills. These are precisely the solutions that improve energy performance and are now becoming a strong advantage, because they are measurable, comparable, and increasingly often translate into a higher property value. In addition, an energy audit or energy performance certificate may be required when selling a house, and banks are increasingly taking such data into account when assessing a property and credit risk. As a result, upgrades aimed not only at appearance but also at energy efficiency can make a sale easier and make the house significantly more attractive to buyers.

Hybrid inverters are chosen primarily by people who want to make better use of the energy from their own PV system. Instead of feeding most of the surplus back into the grid, they can use it for current household consumption or, after adding an energy storage unit, save it for later. This higher self-consumption is one of the most common reasons for choosing a hybrid solution.

The second important reason is preparing the system for an energy storage unit in the future. Many people do not want to invest in a battery right away, but they want the system to be ready for expansion in a year or two. In this sense, a hybrid inverter can be a “future-proof” solution, because it simplifies the later addition of storage and provides more flexibility than a conventional on-grid inverter.

Another motivation is greater control over how the system operates and how much energy is fed into the grid. In practice, users care not only about producing electricity, but also about more predictable management of surplus energy, limiting energy fed into the grid, and better aligning the system’s operation with household consumption. In Luxembourg, this is of additional importance, because Creos – the main electricity and gas grid operator in Luxembourg – provides specific technical requirements for PV installations with self-consumption, including limits concerning inverter power in certain connection models.

For some investors, emergency functions are also important. Some hybrid inverters can work with an energy storage unit in such a way that, during a power outage, they can keep selected household circuits running. This is an important argument especially where the user wants to secure the refrigerator, internet, lighting, or a few of the most important devices. It should be remembered, however, that the scope of such support depends on the specific model and configuration, and the term “hybrid” itself does not always mean full backup power for the entire building. For some devices, additional modules that cooperate with the hybrid inverter are also installed.

BIPV, or building-integrated photovoltaics, works differently from traditional panels mounted on a finished roof. In a conventional system, the modules are an additional layer installed on top of the existing roofing. In the BIPV model, the photovoltaic element becomes part of the building envelope itself – replacing a section of the roof, roof tiles, or façade. That is why a solar roof is so often chosen where a consistent architectural appearance, design restrictions, or a high finishing standard matter. However, this solution involves higher costs and also requires greater involvement from the building designer. In this case as well, a high standard of workmanship is extremely important. It is necessary to think not only about energy production, but also about airtightness, ventilation, loads, and integration with the entire building structure. For this reason, simple calculations based on price per kWp are not particularly meaningful here. In the case of integrated photovoltaic panels, part of the cost includes construction or finishing materials that are not present in standard PV systems. The economic value of such an investment is therefore not assessed solely by the purchase cost of the installation itself, but from a broader perspective – combining construction, aesthetic, and energy functions in one system.

At first glance, ground-mounted panels may seem more efficient, while roof systems appear simpler and more cost-effective. In practice, however, neither option is universally better—the right choice depends on the roof structure, available land, shading, long-term energy goals, and local permitting rules. 

To make comparison easier, below is a brief summary of the key differences. You can also jump directly to the full comparison table 👉 see the comparison.

Traditional solar panels are mounted on top of the roof on dedicated racking hardware. This preserves the original roof underneath and creates a visible technological layer. This method is familiar to installers across Luxembourg, making it efficient, predictable and relatively inexpensive. The structure remains intact, and the PV system can be installed without altering the building envelope. 

Solar inverter clipping occurs when a photovoltaic array generates more DC power than the inverter can convert into AC at that moment. Every inverter has a fixed maximum AC output rating, and once the PV array surpasses that limit, the solar inverter clipping effect begins: the inverter automatically reduces the power it delivers. Instead of processing the full amount of available DC energy, it outputs only what its rating allows, while the excess is lost as inverter clipping losses.