Grid switching box for your PV system
True emergency power supply in case of power outage – fully automatic & VDE compliant
Continue using your solar power even during a grid outage. A grid transfer box will ensure your solar power is always available. entire house independently supplied from the public electricity grid – including heat pump, electric stove and all 3-phase consumers.
Discover the network switching box now
Rates: Emergency power solutions at a glance
Emergency power outlet vs. hybrid inverter vs. true grid transfer box
| Property | Emergency power socket at the inverter |
hybrid inverter with backup function |
Genuine network switching box dedicated solution |
|---|---|---|---|
| switching time | Manual / 30+ sec. | 10-20 seconds | 20-100 milliseconds |
| supply area | Only 1-2 devices | Selected circuits | entire house network |
| Maximum Performance | Max. 3 kW | 3-10 kW | Up to 20 kW (63A) |
| 3-phase care | No (single-phase) | Often only single-phase | Fully 3-phase |
| Heat pump / electric stove | Not possible | Usually not possible | Fully supported |
| IT systems / servers | Not recommended | Data loss possible | UPS-like safety |
| All-pole network disconnection | No | No | Yes (L1+L2+L3+N) |
| Black start capable | No | Limited | Grid-forming capable |
| Can be retrofitted | If available | WR replacement needed | Easy to retrofit |
| VDE conformity | Not compliant with standards | Manufacturer dependent | DIN VDE 0100-551 |
Our recommendation: For a fully self-sufficient home energy supply in off-grid mode – including heat pump, heating, IT equipment, and all critical appliances – a dedicated grid transfer switch is essential. The seamless switchover within 20-100ms prevents data loss and protects sensitive electronics.
Applications: Supply the whole house
A network switching box supplies ALL electrical circuits in your house – not just individual sockets.
Heat pump
Heating and hot water remain available in winter
Refrigerators
Refrigerator and freezer without interruption
Home office / IT
Continue operating PCs, routers, and NAS devices without data loss
Heating control
Pellet heating and gas heating remain controllable
Electric stove / oven
Continue using 3-phase kitchen appliances
Aquarium / Terrarium
Life support systems remain active
Office / Commercial
Securing business-critical systems
Medical devices
CPAP, ventilation, dialysis at home
✓ Complete home power supply – not just individual sockets
You can supply your system with a 3-phase network switching box. entire home network In island mode. All circuits, all sockets, all consumers – up to 20 kW continuous power and 63A fuse protection.
Understanding island operation: Backup • EPS • Grid forming
The network switching box is the heart of true off-grid operation.
Grid-forming
The grid transfer switch enables the hybrid inverter to create an independent island grid – with a stable frequency (50Hz) and voltage (230V/400V). The house becomes a self-sufficient energy island.
EPS / Emergency Power Supply
In the event of a power outage, the system automatically switches to emergency power mode (EPS). The transfer switch coordinates the transition and activates island operation within milliseconds.
Backup / Emergency power
The stored solar power is used as a backup. When the sun is shining, the PV system recharges the storage unit in parallel – this way, the power supply can be maintained for several days.
Why a backup network switch box makes sense for private households and offices
The average power outage duration in Germany is about 12 minutes per year. However, significantly longer outages can occur regionally – especially during extreme weather.
Without a grid transfer switch, your inverter will shut down for safety reasons in the event of a power outage. Your PV system and storage will then be useless, even though there would be enough energy available.
- Private household: Heating, cooling, internet and lighting remain available – especially important in winter
- Home office: No work interruption, no lost data, stable internet connection
- Office / Commercial: Servers, cash registers, alarm systems and critical systems remain online
- Medical care: Operate CPAP devices, ventilators or dialysis at home without interruption
This is how the network switching box works
The grid transfer switch is the heart of your emergency power supply. It coordinates the energy flows between the PV system, storage, and the house grid.
In the event of a power outage, it disconnects your house from the public grid and activates island operation – all fully automatically within milliseconds.
- Intelligent load management prioritizes important consumers
- Compatible with Fronius, SMA, Sungrow, SolaX, SOFAR, GoodWe
- All-pole network isolation (L1, L2, L3 and N) for maximum safety
- Integrated smart meter continuously monitors network quality
- Automatic switchover after power supply return
Technische Specifications
All systems meet the highest security standards.
TN-S & TT networks
Suitable for various network types
DIN VDE 0100-551
Fully compliant with standards
-20 ° C to + 40 ° C
Wide temperature range
Max. 10kA
Short-circuit withstand capability
Frequently asked Ask
Everything you need to know about the network switching box at a glance
A grid transfer switch enables automatic emergency power supply to your home during a power outage, provided by your PV system. Without this switch, the inverter shuts down for safety reasons during a grid failure. The transfer switch disconnects your home's electrical system from the public grid, allowing for off-grid operation with your solar panels and battery storage.
High-quality network switching boxes switch over within 20 to 100 milliseconds. This speed is comparable to a UPS system and ensures an uninterrupted power supply. Sensitive devices such as computers, servers, or heating controls continue to operate without needing to be restarted.
Grid transfer boxes are compatible with hybrid inverters from leading manufacturers such as Fronius, SMA, Sungrow, SolaX, SOFAR, GoodWe, Huawei, and Growatt. The box works with the inverter's EPS/backup output. Please contact us for specific model compatibility.
Installation must be carried out by a qualified electrician. The network transfer box is installed in the meter panel or as a wall mount and must be connected according to VDE standards. The network operator must be informed of the installation.
Yes! A three-phase grid transfer switch supplies your entire home electrical system, including all three-phase appliances such as heat pumps, electric stoves, and instantaneous water heaters. With a fuse rating of up to 63A and a continuous power output of up to 20kW, you can operate your entire house in off-grid mode.
The emergency power outlet on the inverter only supplies individual connected devices with a maximum of 3kW. A grid transfer switch, on the other hand, supplies the entire house network with up to 20kW, enables 3-phase supply, and offers a significantly faster switching time of under 100ms instead of several seconds.
The duration depends on your storage capacity and consumption. A 10kWh storage system can supply an average household for 8-24 hours. When the sun is shining, the PV system recharges the storage system simultaneously, making a multi-day supply possible.
With all-pole network disconnection, all conductors (L1, L2, L3 and N) are simultaneously disconnected from the public grid. This is the safest method and complies with the VDE standard. It protects installers and prevents backfeeding into the public grid during a power outage.
Yes, grid transfer switches can easily be retrofitted to existing PV systems. They require a compatible hybrid inverter with EPS/backup function and a battery storage system. Installation is carried out by an electrician in the meter panel or as a separate wall mount.
Yes, since 2023, photovoltaic components, including grid-tie inverters, are subject to a reduced VAT rate of 0% for private customers. This regulation applies to systems up to 30 kWp on or near residential buildings. This saves you 19% on your purchase.
Personal Consulting
Our team of experts will be happy to assist you:
Phone: 05068 7808880 (9am-12pm)
Email: ppgad@pucrs.br
WhatsApp: 05068 7808880
Network switching boxes at PVundSO
High-quality systems for your emergency power supply – now with 0% VAT for private customers
Do you have any questions about the network switching box?
Our team of experts will be happy to advise you • By phone, email or WhatsApp
Contact usBuy a grid switching box for your PV system online at a great price
A grid transfer switch enables emergency power supply to your home during power outages caused by your photovoltaic system. Without this component, the inverter automatically shuts down for safety reasons as soon as the public grid fails. The PV grid transfer switch disconnects your home's electrical system from the grid, allowing for off-grid operation. At PVundSO, you'll find high-quality grid transfer switches for various requirements with fast delivery.
The PV system transfer switch works in conjunction with hybrid inverters and coordinates the power supply between the public grid, the photovoltaic system, and battery storage. Modern systems perform the switchover fully automatically and detect grid outages within milliseconds. As soon as the public grid is stable again, the switchover back to the grid also occurs automatically. Installation must be carried out by qualified electricians to ensure compliance with VDE standards. At PVundSO, you receive only tested PV system transfer switches from renowned manufacturers with complete documentation.
Benefit from a reliable emergency power supply with a transfer switch box
A backup power transfer switch ensures the energy supply to critical appliances during power outages. The average power interruption duration in Germany is approximately 11 minutes per year, but longer outages can occur regionally. With a PV backup power transfer switch, you can continue to use your stored solar power independently. These systems operate on three phases and supply the entire household electrical system with either 230 volts or 400 volts.
The transfer switch detects a power outage via an integrated smart meter and activates island mode within 20 to 100 milliseconds. During this time, refrigerators, heating controls, IT systems, and other essential appliances remain operational. With sufficient storage capacity and solar radiation, the emergency power supply can be maintained for several days. The photovoltaic transfer switch optimally coordinates the energy flows between solar modules, storage, and appliances. PVundSO offers backup power transfer switch models with outputs from 10 kW to 20 kW for various household sizes.
PV grid switching box for independent energy supply in case of power outage
The PV emergency power transfer box creates true energy independence during grid outages. The system establishes its own island grid, operating independently of the public power grid. The transfer box supplies all connected circuits with self-generated solar energy. The battery storage provides stored energy, while the photovoltaic modules continuously recharge when exposed to sunlight.
Modern grid transfer switches feature intelligent load management functions. These prioritize critical loads and prevent system overloads. With a 10 kWh battery, typical household appliances can be supplied for between 8 and 24 hours, depending on consumption patterns. The solar transfer switch also allows for parallel charging of the battery during emergency power operation. PVundSO offers grid transfer switch systems for PV systems in TN-S and TT networks, all fully CE marked. All components comply with current safety regulations and have been tested according to VDE standards.
PV system switching box with automatic grid switching from PVundSO
The automatic grid transfer switch operates completely independently without manual intervention. An integrated smart meter continuously monitors the grid quality and detects voltage drops or frequency fluctuations. If defined limits are undershot, the system disconnects from the public grid within 20 milliseconds. The hybrid inverter then switches to island mode and supplies all connected circuits.
The transfer switch communicates with the inverter via data interfaces and coordinates all switching operations. After the grid voltage is restored, the system monitors the grid quality for several minutes. Only when stable values are reached does the system automatically switch back to the normal grid. This process prevents damage caused by unstable grid voltages. PVundSO offers transfer switches with integrated Fronius Smart Meters for compatible hybrid inverters. The systems are ready for connection and significantly reduce installation effort. PVundSO offers free shipping on orders over €100; shipping via freight carrier is available for orders over €899.
Solar switching box for 3-phase emergency power supply in private homes
A 3-phase transfer switch for emergency power supplies all three phases of your home's electrical system evenly. This allows three-phase appliances such as heat pumps, instantaneous water heaters, or electric stoves to operate even during power outages. The maximum fuse rating is 63 amps, which corresponds to a continuous power output of approximately 20 kW. All-pole isolation ensures maximum safety for installers and network operators.
The three-phase design prevents phase imbalances that can cause problems in single-phase systems. Modern hybrid inverters automatically distribute the load symmetrically across all three phases. At PVundSO, you'll find grid transfer box models for various grid configurations, including TN-S and TT systems. The devices are available for meter panel or wall mounting. All systems offered come with declarations of conformity and meet the requirements of DIN VDE 0100-551. Delivery time at PVundSO is 3 to 5 business days for parcel shipments. If you have any questions about the right grid transfer box for your PV system, our expert team is available by phone at +49 5068 7808880 or via WhatsApp.
