Kurzantwort
If you are planning to add battery storage to your solar installation, your quote will feature a hybrid inverter. Die optimale Konfiguration hängt von Ihrem tatsächlichen Verbrauch, der Dachausrichtung, dem Batteriebedarf und der Wahl des richtigen Einspeisetarifs ab.
What is a hybrid inverter?
A **hybrid inverter** (sometimes called a multi-mode inverter) is the central "brain" of a modern solar system. While a traditional inverter only converts DC power from your panels into AC power for your home, a hybrid inverter manages **both your solar panels and a home battery bank** simultaneously.
It directs electricity to where it is needed most in real time:
- First, it powers active appliances in your home.
- Second, if there is surplus solar energy, it routes it to charge your physical battery.
- Third, if the battery is full, it exports the remaining surplus to the grid for billing credits.
- At night, it draws stored energy from the battery to run your home, only pulling from the grid if the battery is empty.
Hybrid vs. normal string inverter: What is the difference?
When installers talk about a system being **"battery-ready"**, they mean it uses a hybrid inverter instead of a standard string inverter.
If you install a standard string inverter today and decide to add a battery in three years, you cannot connect the battery directly to the inverter. Instead, you must install an **AC-coupled battery** system, which requires its own separate battery inverter. This increases installation complexity, takes up more space, and introduces double-conversion efficiency losses (DC from panels to AC, then back to DC to charge the battery).
With a hybrid inverter, the battery connects directly into the main unit (DC-coupled). This is cleaner, more efficient, and saves significant hardware cost if you plan to start with solar and add storage later.
Battery-ready does not automatically mean backup power
This is one of the most common misunderstandings in the solar market. Homeowners assume that if they have a hybrid inverter and a battery, their home will stay powered during a grid outage. **This is usually false.**
By default, all grid-tied solar systems (including hybrid systems) are legally required to shut down immediately during a power cut. This is a safety feature (anti-islanding) to protect utility workers who may be repairing power lines.
If you want your battery to power your home during a blackout, you must specifically design for it:
- EPS (Emergency Power Supply) circuit: Many hybrid inverters (e.g., Sungrow, GoodWe) have a dedicated AC backup port. The installer must wire a separate critical loads panel (usually for your fridge, router, and a few lights) to this port. If the grid fails, only these critical appliances keep running.
- Full-home backup: Requires a hybrid inverter combined with a automatic transfer switch or backup gateway (like the Tesla Gateway or Huawei Backup Box). During an outage, this gateway physically isolates your home from the grid, allowing the solar and battery to run the entire house safely.
Always ask your installer: "Does this quote include the physical backup box and critical loads wiring, or does it only charge/discharge the battery while the grid is active?"
Ecosystem lock-in and battery compatibility
Unlike traditional 12V lead-acid batteries, modern high-voltage lithium batteries communicate directly with the hybrid inverter via a data cable. This means you cannot mix and match brands.
Most major manufacturers enforce brand lock-in:
- Huawei Hybrid Inverters: Are only compatible with Huawei LUNA2000 battery systems.
- SolarEdge Inverters: Work primarily with SolarEdge Energy Bank batteries or specific approved models from LG Chem.
- Open Hybrid Inverters (e.g., Victron, Solis, Deye): Offer wider compatibility, allowing you to connect batteries from BYD, Pylontech, or other certified third-party brands.
Before buying a hybrid inverter, look at the cost and availability of its compatible batteries. A cheap inverter might lock you into an incredibly expensive battery ecosystem.
Designing for future expansion
If you are buying a hybrid inverter now with the intention of adding a battery in 3 to 5 years, design with caution:
- Inverter Sizing: A hybrid inverter must be sized to handle the battery charge/discharge rate. If you buy a small 4kW hybrid inverter now, it will limit how fast a future battery can charge or feed power to your home.
- Rapid Technology Shifts: Battery chemistry and communication protocols change quickly. A hybrid inverter installed today might not support the battery models available on the market in 2030. If your budget allows, it is usually better to install the solar and battery together, or buy an open-standard inverter.
Questions to ask your installer about hybrid quotes
Review your hybrid inverter quote and ask the following:
- What battery brands and models is this exact inverter compatible with?
- What is the maximum charge and discharge speed (kW) of the inverter?
- Is the backup box (transfer switch) included in this quote, or is it an extra charge?
- How many critical circuits will remain powered during a blackout, and are they pre-wired?