FAQs about photovoltaics, battery storage & more

Yes, in the vast majority of cases, a photovoltaic system is absolutely worth it—both ecologically and economically. Without a battery, you can typically cover around 30% of your electricity needs yourself. When combined with a battery storage system, self-consumption often rises to 60–70%.

Thanks to intelligent energy management, this value can be increased even further: appliances like heat pumps or wallboxes are specifically activated when solar power is available. This can boost self-sufficiency by up to an additional 20%, depending on the household.

Natur Energietechnik plans your energy system holistically, ensuring that photovoltaics, storage, and energy management work together optimally so you get the maximum out of your solar power.

As a rule, no planning permission is required for private rooftop systems. However, it is essential to register your system with the local grid operator and enter it into the Marktstammdatenregister (MaStR)—the Central Core Data Register of the Federal Network Agency. This officially integrates your system into the power grid and allows you to feed in excess energy. Natur Energietechnik supports you with all the formalities, ensuring your system is connected to the grid safely and in compliance with all standards.

Photovoltaic systems are designed for a lifespan of 30 years and more. Many manufacturers now offer performance warranties spanning 30 to 35 years, and even after this period, the modules usually continue to work reliably—just with slightly reduced output. The keys to success are high-quality components, professional installation, and regular inspections—which is exactly what Natur Energietechnik and its experienced team stand for.

Absolutely — a photovoltaic system is a meaningful investment in your property and the next generation. It increases the value of your home, reduces ongoing energy costs, and leaves behind a legacy of independence that lasts.

And best of all: Natur Energietechnik takes full care of the planning, installation, and registration—so you can sit back, relax, and enjoy the benefits.

Since 2023, significant tax reliefs have applied to residential photovoltaic systems. For systems up to 30 kWp, income tax on earnings is generally eliminated—both for self-consumed and fed-in electricity. Furthermore, a 0% VAT rate applies to the purchase and installation of the system.

These regulations, introduced as part of the EEG 2023 (Renewable Energy Sources Act), make starting your own power production financially highly attractive.

For further detailed tax information, we recommend reviewing publications by the Verbraucherzentrale (Consumer Advice Center) or speaking with your tax advisor.

Natur Energietechnik keeps you informed about the latest regulatory frameworks and supports you throughout the implementation—though, of course, this does not constitute formal tax advice.

Yes, there are various funding and financing programs available to make the transition to solar energy easier. In addition to nationwide KfW loans, many federal states, municipalities, and energy providers offer their own grants or low-interest loans. This can be an attractive option to make the investment highly predictable, especially for families or modernization projects.

If you are considering third-party financing, we also recommend discussing potential financing models with your primary bank at an early stage. A specialized subsidized loan isn't always more favorable than a conventional bank loan — it definitely pays to compare.

Natur Energietechnik provides transparent information on current programs and supports you in finding an economically viable solution tailored to your project.

Photovoltaic systems are generally very low-maintenance. Since there are no moving parts installed, there is hardly any wear and tear. Nevertheless, we recommend regular visual and functional inspections by professionals to check for dirt, inspect cable connections, and monitor the condition of the inverters. This ensures that your system operates reliably and delivers full performance for many years to come.

Upon request, Natur Energietechnik offers tailored maintenance packages—ranging from professional cleaning to technical inspections.

In addition to a energy storage system , there are several ways to increase your self-consumption:

• Automated control of household appliances (e.g., washing machines or heat pumps) during peak sunshine hours.
• Charging electric vehicles with solar power via a wallbox.
• Adjusting consumption habits to match daily energy production.
• With a suitable energy management system, your setup automatically detects when surplus power is available and utilizes it efficiently—without any loss of comfort.

Auch bei schlechtem Wetter arbeitet Ihre PV-Anlage – wenn auch mit geringerer Leistung. Hochwertige Module erzeugen selbst bei diffusem Licht noch Strom. An Tagen mit wenig Sonneneinstrahlung wird der zusätzliche Bedarf automatisch über das Stromnetz gedeckt. Mit einem  können Sie sonnige Tage ausgleichen und den Solarstrom auch nachts oder bei trüber Witterung nutzen.

Your PV system keeps working even in poor weather—albeit at a lower output. High-quality modules generate electricity even under diffuse light conditions. On days with low solar radiation, any additional demand is automatically covered by the power grid. With a battery storage system, you can balance out sunny days and use your solar power at night or during overcast weather.

Photovoltaic systems don't have a "traditional" end of life. Even after 25 or 30 years, most modules continue to produce electricity—experiencing only a slight degradation in performance of just a few percent over the decades.

A replacement is only considered when a system can no longer be operated economically or is due for modernization. When that time comes, photovoltaic modules are almost entirely recyclable: glass, aluminum, and silicon can be recovered and integrated into new modules.

In Europe, manufacturers are legally required to properly recycle old systems, and many already run their own take-back programs. This ensures that solar power remains a sustainable source of energy—not just during operation, but over the long term.

An energy storage system is highly viable whenever the objective is to optimize the utilization of self-generated solar electricity. Rather than exporting surplus energy to the public grid, you retain it for periods without solar generation—specifically evenings, nighttime, or overcast days. This significantly reduces your electricity expenses and enhances your autonomy from energy suppliers.

In conjunction with dynamic electricity tariffs and predictive energy management, storage units unlock further economic advantages: the system leverages price fluctuations by charging during off-peak hours and releasing the stored energy at economically optimal times. Consequently, depending on your specific consumption patterns, the return on investment can be accelerated.

The exact payback period of the storage system depends on your electricity consumption, the storage capacity, and the operational concept. Natur Energietechnik provides customized calculations tailored to your requirements.

The right storage size depends on how much electricity you use daily and the size of your photovoltaic system.

As a rule of thumb, the storage system should cover about one-third to one-half of your average daily consumption—for a single-family home, this is typically between 10 and 20 kWh. A system that is too small can limit your self-consumption, while one that is too large often won't pay for itself.

Our experts at Natur Energietechnik will provide personalized advice to ensure your storage system perfectly matches your energy needs—both today and in the future.

Yes. The energy storage systems we utilize are based on a modular architecture, allowing for subsequent expansion in response to rising energy demands. For instance, if a smart charging station (Wallbox), a heat pump, or further electrical loads are integrated into your household, the storage capacity can be scaled to match.

We evaluate the feasibility and optimal scope of an upgrade on an individual basis—ensuring both technical compatibility and long-term cost-effectiveness. Consequently, your energy ecosystem remains adaptable and evolves with your changing needs.

Don't worry—your home will remain reliably supplied with power.

As soon as the battery is empty or the PV system generates too little energy, your household automatically draws electricity from the public grid.

The switch happens completely seamlessly—you won't notice a thing. If you wish, your system can even be configured to recharge immediately as soon as the sun comes out, ensuring it is always prepared for the following night.

Natur Energietechnik provides the intelligent control between your storage system, PV installation, and the grid—ensuring maximum power security in any weather.

Within an energy storage system such as the sonnenBatterie, power undergoes thousands of charging and discharging cycles over a prolonged lifespan. Consequently, tier-one manufacturers utilize exceptionally dependable and sustainable lithium iron phosphate ($LiFePO_4$) battery technology.

This chemistry is recognized for its longevity, thermal stability, and enhanced safety profile compared to alternative lithium-ion variants commonly found in smartphones or electric vehicles. Furthermore, lithium iron phosphate stands out as the sole battery material that exists as a natural compound and is entirely free of toxic heavy metals—benefiting both public health and environmental sustainability.

Modern energy storage systems, such as the sonnenBatterie, are engineered for a service life of 10 to 20 years, depending on operational patterns and environmental conditions. The integrated lithium iron phosphate technology guarantees that substantial capacity is retained even after thousands of charge-discharge cycles.

Due to smart management systems, charging and discharging cycles are gently regulated, thereby maximizing the overall longevity of the equipment.

Natur Energietechnik designs each installation individually to ensure you derive reliable, long-term value from your investment.

Yes, provided the system configuration is appropriately selected. In conjunction with a backup power feature or a comprehensive emergency power solution, the storage unit can sustain the energy supply to your home in the event of a grid outage. Crucially, this functionality must be factored into the initial design phase and properly integrated technically. Our specialists will outline the available possibilities and determine which storage systems best align with your specific requirements.

Generally, energy storage systems are virtually maintenance-free because the intelligent electronics continuously self-monitor and immediately flag any issues. In the unlikely event of a technical hitch, Natur Energietechnik guarantees premier regional support to minimize downtime and restore full operational readiness swiftly.

Various regional and federal incentive programs are periodically launched to subsidize the acquisition of energy storage systems. Certain federal states and municipalities offer direct grants, particularly for integrated installations alongside a photovoltaic setup. Given that funding guidelines adapt frequently, we will gladly advise you on the latest options and, if desired, manage the entire application procedure on your behalf.

Absolutely, and that is exactly where an energy storage system unleashes its maximum capabilities.

In conjunction with an EV charging station or a heat pump, you can optimize the utilization of your solar energy and drive your self-consumption rates even higher. Through a smart energy management system, Natur Energietechnik coordinates all components for seamless interoperability — guaranteeing peak independence and energy efficiency.

A solar PV system generates power, whereas energy management dictates its utilization.

While many installers conclude their service upon completing the PV installation, we take it a step further. By integrating smart energy management, we ensure your solar energy is utilized efficiently, stored, or supplemented as needed. This elevates a standard PV setup into a well-engineered, independent home energy ecosystem.

Energy management enables the smart integration of all relevant power generation assets and loads within a household. This encompasses the solar PV system, energy storage units, heat pumps, heating installations, EV charging stations, and selected domestic appliances. Natur Energietechnik provides comprehensive planning for this infrastructure, ensuring seamless interoperability across all components.

Yes. Even without a storage system or an EV, energy management can be highly beneficial, for instance, to target energy use within the household or to prepare for future expansions. We design systems to grow with your needs—from an entry-level setup to a fully networked, self-sufficient energy supply.

Yes! Existing photovoltaic systems or home automation technologies can easily be integrated into an energy management system. We will assess your current equipment and build a solution upon it that not only works today but extracts the absolute maximum from your solar power in the long run.

Yes. Energy management systems are eligible for subsidies under the Federal Funding for Efficient Buildings (BEG). This covers not only the central control unit itself but also necessary components such as meter and sensor technology, control modules for consumers (e.g., heat pumps or wallboxes), software licenses, data loggers, network technology, as well as installation and commissioning.

The subsidy currently amounts to 15% of the investment costs. If the measure is implemented as part of an Individual Renovation Roadmap (iSFP), the grant can increase to up to 20%. Eligible investments are capped at €30,000 per residential unit (or €60,000 with an iSFP).

Natur Energietechnik supports you in planning your energy system so that technical possibilities and funding programs align perfectly.

No, a standard household outlet is usually unsuitable for continuous charging: it delivers low power (often < 2.3 kW), is subject to higher thermal stress, and poses safety risks. A wallbox, on the other hand, is specifically designed for continuous operation, offers much higher charging power (up to 22 kW), and is significantly safer to operate.

No two parking spaces are alike—which is why our certified electricians inspect the conditions directly on-site. During this visit, they assess existing connections, the distance to the fuse box, and the required cable length. Based on this data, you will receive detailed documentation and a personalized cost estimate. This ensures you know exactly what is technically possible and what costs to expect right from the start.

The professional installers at Natur Energietechnik ensure a safe installation of your wallbox that complies with all relevant standards. After all, connecting a charging station involves high-voltage electricity—where technical expertise, experience, and the right measuring and protective equipment are critical. A DIY installation by non-professionals is not only dangerous but can also jeopardize insurance coverage and warranty claims. With us, you have the peace of mind that everything is professionally tested, connected, and documented.

Yes. In many cases, registration or at least a notification to the responsible grid operator is required. For wallboxes up to 11 kW, registration is usually mandatory, whereas higher capacities may require official approval.

We are happy to handle the coordination with the grid operator for you—from the initial registration to technical clarification. This ensures that your charging infrastructure can go into operation smoothly and in compliance with all regulations.

This depends on several factors:

• the maximum charging capacity of your vehicle,
• your home’s grid connection capacity,
• future plans (e.g., additional electric vehicles),
• and the amount of available solar power.

Many households opt for 11 kW (three-phase) as a practical compromise between charging speed and grid load. Some choose 22 kW (provided the grid and your system allow for it).

The experts at Natur Energietechnik will provide personalized advice to ensure your wallbox, vehicle, and photovoltaic system work together perfectly. This gives you a solution that fits today—and is already thought through for the future.

Yes—provided it features the right interfaces or smart load management. This allows surplus solar power to be prioritized for charging your vehicle. Combining this setup with a battery storage system is ideal, enabling you to use solar energy even during periods of low sunshine.

Yes. If there isn't enough solar power available, the wallbox can automatically draw electricity from the grid. Our energy management system  precisely controls exactly how and when charging occurs. By default, several charging modes are available, for example:

• Maximum charging power
• PV-optimized charging (with a defined minimum output)
• Manually adjustable charging power

The system is fully programmable and can be customized to your specific requirements. The ultimate goal is always to maximize your self-consumption and manage grid power consumption wisely.

This depends on three main factors:

1. your vehicle's battery capacity,
2. the charging power of your wallbox,
3. and whether you are charging with solar power or grid electricity.

As a general guide:
An electric car with a 60 kWh battery fully charges at an 11 kW wallbox in about 6 hours—making it easy to top up overnight. Vehicles with a smaller battery (e.g., 40 kWh) will charge faster, while larger batteries will take a bit longer.

If you combine your wallbox with your photovoltaic system, you can automatically manage the process to prioritize your own solar power. Natur Energietechnik helps you set up the perfect interplay between your vehicle, wallbox, and PV system—efficiently, safely, and ready for the future.

Yes, that is generally possible. Depending on your home's grid connection capacity, you can either use a single wallbox equipped with load management or multiple wallboxes that intelligently share the available power. Natur Energietechnik custom-designs these systems to ensure that charging remains reliable, well-thought-out, and grid-friendly—even with multiple vehicles.

Yes, modern wallboxes can be linked to your photovoltaic system and controlled to prioritize using your own solar power. Depending on the system, you can determine if and when grid power should be added—for example, when the sun isn't shining or if the car needs to be charged quickly. Natur Energietechnik sets up your wallbox so you can control charging easily and intelligently, tailored entirely to your needs.

With your own wallbox, you can conveniently charge your electric car right where it spends most of its time anyway—at home. You save yourself detours, waiting times, and the dependency on public charging stations. It becomes truly smart if you have a photovoltaic system and can use your own solar power for charging—which is particularly cost-effective and sustainable. Compared to public charging rates, this significantly lowers your electricity costs per kilometer.

Natur Energietechnik ensures that your wallbox, PV system, and energy management work together perfectly—for maximum independence and convenience.

Modern wallboxes are engineered to meet the highest safety standards. They feature built-in protection mechanisms such as residual current protection, temperature monitoring, and surge protection. When the system is professionally installed and regularly inspected, the risk of damage or overheating is extremely low.

By having it installed by the certified experts at Natur Energietechnik, you ensure that all components are perfectly matched and professionally protected—fully in line with all applicable standards. This allows you to charge your vehicle with complete peace of mind.

Currently, there are no longer any nationwide funding programs for private wallboxes (as of spring 2026). However, certain cities or municipalities still occasionally offer regional subsidies.

Important: Funding conditions change regularly, and applications generally must be submitted before purchase or installation. We provide transparent information about potential regional programs and work with you to check if your project qualifies for funding.

Many wallboxes are portable or can be uninstalled and moved with you. In apartment buildings or condominiums, approval from the homeowners' association (HOA) or the landlord is often required. (For tenants: in many cases, you have a legal right to request the installation.)

Yes, that is absolutely possible without any issues. Most wallboxes are designed for outdoor use and feature IP protection ratings against rain, dust, and temperature fluctuations. This means they can be mounted under a carport or on an exterior wall—without any worries about weather conditions.

It is important that the installation is performed professionally and that the electrical connections are properly protected and sealed. Our certified installation specialists at Natur Energietechnik ensure that your wallbox is perfectly positioned and that all wiring is routed safely.