900W solar system with Fothermo heating rod for hot water boiler

The Offgridtec solar system with Fothermo heating element is the perfect all-in-one solution for self-sufficient hot water production using solar power. It combines high-performance, bifacial Luxen Solar 450W PV modules with the innovative Fothermo photovoltaic heating element for direct installation in standard hot water boilers. The kit is available in versions with 2, 3, or 4 modules and includes all the necessary connection components for quick and easy installation.

Self-Sufficient Hot Water Production with the Offgridtec Solar System

The kit includes all the components you need to power your existing hot water heater with solar energy. The simple plug-and-play installation is particularly convenient, as it can be done without the need for a licensed electrician. You can flexibly configure the system with 2, 3, or 4 modules—depending on your individual hot water needs and installation options.

Why this kit is ideal for your hot water needs:

• 100% self-sufficient hot water production: Complete independence from the power grid thanks to direct solar heat.
• Highly efficient modules: Luxen Solar 450W bifacial full-black modules with modern TopCon technology for maximum power output—even in diffuse light.
• Easy retrofitting: The Fothermo solar heating element fits into many standard boilers with a 1½-inch connection and makes existing systems solar-compatible.
• Plug-and-play: Quick installation including all necessary connection cables and connectors, no electrician required.
• Flexibly customizable: Choose between 2, 3, or 4 modules depending on your hot water needs.

Components of the Offgridtec solar system with Fothermo heating element

• 2x / 3x / 4x Luxen Solar 450W Bifacial Solar Module TopCon Luxneri Series N5 Full Black (depending on selection)
• 1x Fothermo photovoltaic heating element for hot water boiler
• 3x / 4x / 5x MC4-to-MC4 connection cables, 6mm², 5m, red/black (depending on selection)
• 1x Offgridtec 2-way Y-connector with extension cable (pair)

Luxen Solar 450W Bifacial Full Black Solar Modules with TopCon Technology

The Luxen Solar modules included in the set feature state-of-the-art N-TOPCon cell technology with a bifacial design, which increases output by capturing light on both the front and back sides.

• Maximum power: 450 W per module
• Module voltage (Vmp): 30.08 V
• Module efficiency: 22.52%
• Dimensions: 1762 × 1134 × 30 mm
• Weight: 24 kg
• Protection rating: IP68

Fothermo Photovoltaic Heating Element for Hot Water Boilers

The Fothermo heating element converts the direct current from the solar modules directly into heat and efficiently heats your existing water heater—without a grid connection or inverter.

• Heating power: up to 550 W
• Maximum Uoc: 50 V DC
• 1½-inch thread, compatible with standard water heaters
• Protection class: IPX4
• Ideal for garden sheds, tiny houses, or off-grid systems

Connection components

• Offgridtec 2-way Y-connector with 1 m extension cable (pair)
• MC4-to-MC4 connection cable, 6 mm², 5 m (quantity varies by model)

Solar-powered hot water – usable anywhere

With this kit, you can reliably produce hot water—completely off the grid. The Fothermo heating element activates automatically when exposed to sunlight and feeds excess PV power directly into the water storage tank. Operation is silent, maintenance-free, and particularly efficient thanks to DC direct heating.

• 100% solar-powered, no ongoing energy costs
• Ideal for off-grid systems, garden sheds, cabins, and much more
• No inverter or grid connection required