2.7 kWp solar system with 300 L Fothermo boiler for hot water production

The Offgridtec 2.7 kW solar system with a 300-liter Fothermo boiler (MPN 018920) offers a comprehensive solution for your hot water supply. It includes 6 bifacial solar modules from Luxen Solar, each with an output of 450 Wp, as well as all the necessary cables to ensure a smooth installation. The photovoltaic stand-alone boiler features an integrated heat exchanger for an eco-friendly supply of hot water and can be seamlessly connected to existing heating systems.

You can use hot water at the sink, in the shower, or in the kitchen without needing to connect to the power grid. Thanks to the plug-and-play principle, you can install the solar system yourself in just a few simple steps.

Components of the Offgridtec 2.7kW solar system with 300L Fothermo boiler

• 6x Luxen Solar 450W Bifacial TopCon N5 Full Black solar modules
• 1x Fothermo 300-liter photovoltaic boiler
• 3x Offgridtec 2-way Y-connectors with extension cables (pair)
• 6x Offgridtec 10m 6mm² MC-4 connection cable plug/socket extension

Fothermo 300-Liter Photovoltaic Water Boiler - Water Heater

The Fothermo 300L water boiler uses solar energy to provide cost-effective and eco-friendly hot water. With three independently operating photovoltaic heating elements, it delivers hot water quickly and reliably. The 3 MPP trackers and DC heating elements provide a photovoltaic heating output of up to 1,800W.

Flexible inlets and outlets allow for custom installation, including the option to connect a circulation line. The boiler comes equipped with pressure relief and check valves. The floor-standing boiler can utilize up to a total of 6,000 Wp of photovoltaic power. An existing heating system can be connected directly to the heat exchangers integrated into the boiler to ensure a sufficient supply of hot water even on days with little sunlight.

Technical Specifications Fothermo 300L Water Boiler

• Volume: 300 liters
• Max. heat loss: 50.2 W
• Nominal pressure: 0.8 MPa
• Dimensions: 1605 x 670 x 760 mm
• Weight: 88 kg
• 3 MPP trackers

Heat exchanger

• Nominal pressure: 1 MPa
• Max. temperature of the heating fluid: 110°C
• Max. temperature in the tank heated by the heat exchanger: 95°C
• Surface area: 1.12 m²
• Volume: 5.4 liters
• Continuous output according to DIN 4708: 35 kW
• Flow rate according to DIN 4708: 14 L/min
• Output according to EN 12897: 19.3 kW
• Heating time according to EN 12897: 39.4 min
• Pressure drop: 50 mbar

Photovoltaic heating

• Max. current consumption: 16 A
• Rated electrical power: 1800 W
• Max. connected power: 6000 Wp
• Max. connected power per MPPT: 2000 Wp
• Max. water temperature: 65°C
• Max. open-circuit voltage: 50V

Supplementary heating

The boiler can be reheated in various ways if there is insufficient sunlight. One option is to use an existing wood pellet, gas, or oil heating system, which is connected via the integrated heat exchanger in the boiler. A temperature sensor in the boiler controls the supplementary heating. Alternatively, an electric heating element with a 6/4-inch thread can be installed. The maximum water temperature is 65°C, and a heated 300-liter boiler can supply approximately 675 liters of water at 34°C.

The Luxen Solar 450W Full Black Bifacial Solar Module

The bifacial 450W Full Black solar module from Luxen Solar’s Luxneri N5 series (MPN LNDX-450ND) sets new standards in solar technology. It combines innovative technologies such as LECO N-TOPCon cell technology and a 96-cell half-cut layout to maximize efficiency. It also utilizes SMBB half-cut cell technology, which helps optimize performance.

• LECO N-TOPCon cell technology
• SMBB Half-Cut Cell Technology
• Low BOS & LCOE
• Bifacial cell module technology
• Excellent anti-PID and low LID performance
• 3 bypass diodes - minimized power loss under shading

Technical Specifications

• Maximum power: 450W
• Module voltage (Vmp): 30.08V
• Max. current (Imp): 14.96A
• Open-circuit voltage (Voc): 35.21V
• Short-circuit current (Isc): 16.02 A
• Module efficiency: 22.52%
• Max. operating voltage: 1500 V 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