900W solar system with Fothermo solar heating rod, switch device, and Hoymiles HMS-800W-2T with 800W grid feed-in

The Offgridtec solar heating rod set is the ideal complete solution for efficient hot water production using solar power. It combines high-quality Luxen Solar 450W bifacial modules, the powerful Fothermo photovoltaic heating rod, the separate Fothermo switchover device, and the modern Hoymiles HMS-800W-2T micro inverter with WiFi. Thanks to plug-and-play technology, the system is quick to install and reliably provides hot water—even in low sunlight conditions.

Solar heating rod set for self-sufficient hot water supply

The set contains all the components you need to operate your existing hot water boiler with solar power. The automatic switchover device seamlessly switches between solar and mains operation, ensuring that hot water is available at all times. You can flexibly configure the set with 2, 3, or 4 modules, depending on the desired output and individual consumption.

Why this set is the perfect combination:

• High energy efficiency: The bifacial Luxen modules with TopCon technology also use reflected light, thereby increasing power generation.
• Reliable hot water production: The Fothermo photovoltaic heating element converts solar power directly into heat, supported by the automatic switchover function to grid operation.
• Seamless switching between solar and grid power: The switchover device ensures safe and automatic switching – hot water is guaranteed at all times.
• Flexible system sizes: Choose between 2, 3, or 4 modules to suit your consumption and area of application.
• Convenient monitoring: The Hoymiles HMS-800W-2T micro inverter with integrated WiFi enables real-time monitoring and control.

Components of the Offgridtec solar heating rod set

• 2x / 3x / 4x Luxen Solar 450W bifacial solar module TopCon Luxneri Series N5 Full Black (depending on selection)
• 1x Hoymiles HMS-800W-2T micro inverter with integrated WiFi
• 1x Fothermo switch device for photovoltaic boiler to feed-in
• 1x Fothermo photovoltaic heating rod for hot water boiler
• 4x / 5x / 6x MC4 to MC4 6mm² 5m red/black connection cable - module & heating rod to switch device (depending on selection)
• 1x MC4 to MC4 6mm² 2m red/black connection cable - switch device to inverter
• 1x 10m 3x1.5mm² connection cable for Hoymiles HMS micro inverter

Fothermo switch device photovoltaic boiler to feed-in

The Fothermo switch is the intelligent control center of your system. It automatically detects when there is sufficient solar power available to supply the heating element. As soon as the solar output is no longer sufficient, the device automatically switches to grid operation or feed-in. This ensures maximum use of the solar power you generate yourself and guarantees a constant supply of hot water.

• Automatic switching between solar and grid operation
• Optimal use of self-generated solar power
• Plug-and-play installation without additional configuration
• Compact and robust housing

Fothermo photovoltaic heating rod

The Fothermo heating rod converts solar power directly into heat, thereby heating your existing hot water boiler. In conjunction with the switchover device, hot water is available at all times—even when solar output is insufficient.

Technical data Fothermo heating rod

• Heating capacity: up to 550W
• Automatic switchover (in combination with the switchover device) between solar and mains operation
• Direct connection to solar modules via MC4 connector
• Protection class: IP 24
• Simple plug-and-play installation
• Recommended PV power: 300-1,200 Wp
• Max. PV power: 2,000 Wp
• Max. open-circuit voltage: 50 Voc
• Housing dimensions: 10 × 15.4 × 13.4 cm
• Heating element dimensions: 41.5 × 15.4 × 13.4 cm
• Weight: 0.8 kg

The Luxen 450W Full Black bifacial solar module

The bifacial 450W Full Black solar module from Luxen Solar's Luxneri N5 series sets new standards in solar technology. Thanks to N-TOPCon technology, half-cut cells, and bifacial design, it achieves a particularly high efficiency. The module utilizes both direct sunlight and reflected light.

Technical data

• Maximum power: 450W
• Module voltage (Vmp): 30.08V
• Max. current (Imp): 14.96A
• Open-circuit voltage (Voc): 35.21V
• Short-circuit current (Isc): 16.02A
• Module efficiency: 22.52%
• Max. operating voltage: 1500V DC
• Operating temperature range: -40°C to +85°C
• Dimensions: 1762 x 1134 x 30 mm
• Cells: 96 (6x16)
• Protection class IP68
• Connection: MC4
• Weight: 24 kg

Hoymiles HMS-800W-2T micro inverter with WiFi

The micro inverter converts the direct current from the solar modules into grid-compliant alternating current. Thanks to integrated WiFi, you can conveniently monitor and control the system in real time.

• Rated power: 800W
• Monitoring via app and web portal
• High efficiency even in partial shade
• Robust design for a long service life