2.25 kWp solar system with 200L Fothermo boiler for hot water preparation

The Offgridtec 2.25kW solar system with the 200l Fothermo boiler (MPN 018915) offers a comprehensive solution for your hot water supply. It includes 5 bifacial Luxen Solar modules, each with 450Wp, as well as all necessary cables to ensure a smooth installation. The photovoltaic stand-alone boiler features an integrated heat exchanger for environmentally friendly hot water supply and can be seamlessly connected to existing heating systems.

You can use hot water in the sink, shower, or kitchen without having to connect to the power grid. The installation of the solar system does not require a professional and can be completed with just a few simple steps.

Components of the Offgridtec 2.25kW Solar System with 200l Fothermo Boiler

• 5x Luxen Solar 450W Bifacial TopCon N5 Full Black Solar Modules
• 1x Fothermo 200 Liter Photovoltaic Boiler
• 2x Offgridtec 2-way Junction Boxes Y-Connectors including Cable Extension (Pair)
• 3x Connection Cable MC4 to MC4 6mm² 10m red/black

Fothermo Photovoltaic Water Boiler 200 Liters - Hot Water Heater

The Fothermo 200L water boiler utilizes solar energy for cost-effective and environmentally friendly hot water. With three independently operating photovoltaic heating elements, it provides rapid and reliable hot water. The 3 MPPTs and DC heating elements ensure a photovoltaic heating capacity of up to 1,800W.

Flexible inlets and outlets allow for custom installation, including the option to connect a circulation line. Each boiler comes with overpressure and non-return valves. The stand-alone boiler can utilize a total of up to 6,000Wp of photovoltaic power. Existing heating systems can be directly connected to the built-in heat exchanger to ensure sufficient hot water even on cloudy days.

Technical Specifications of the Fothermo 200L Water Boiler

• Volume: 200 liters
• Max. Heat Loss: 47.5W
• Nominal Pressure: 0.8 MPa
• Dimensions: 1430 x 600 x 690 mm
• Weight: 74kg
• 3 MPPTs

Heat Exchanger

• Nominal Pressure: 1 MPa
• Max. Temperature of Heating Fluid: 110°C
• Max. Temperature in the Tank Heated by the Heat Exchanger: 95°C
• Area: 0.90 m²
• Volume: 4.3 liters
• Continuous Power according to DIN 4708: 25kW
• Flow Rate according to DIN 4708: 10 L/min
• Power according to EN 12897: 18.6kW
• Heating Time according to EN 12897: 28.8 Min
• Pressure Drop: 120 mbar

Photovoltaic Heating

• Max. Current Consumption: 16A
• Electrical Rated Power: 1800W
• Max. Connected Power: 6000Wp
• Max. Connected Power per MPPT: 2000Wp
• Max. Water Temperature: 65°C
• Max. Open Circuit Voltage: 50V

Supplementary Heating

The boiler can be supplemented in various ways when solar radiation is insufficient. One option is to use an existing pellet, gas, or oil heater that can be connected to the boiler via the integrated heat exchanger. A temperature sensor in the boiler controls the supplementary heating. Alternatively, an electric heating rod with a 6/4 inch thread can be installed. The maximum water temperature is 65°C, and a heated 200-liter boiler can supply about 450 liters of water at 34°C.

The Bifacial Luxen Solar 450W Full Black Solar Module

The bifacial 450W Full Black solar module from the Luxneri N5 series by Luxen Solar (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-layout to maximize efficiency. Additionally, the SMBB half-cut cell technology is used to 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
• Reduced hotspot risk
• 3 bypass diodes - minimized power loss in shading
• High cell efficiency of over 22.52%

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): 16.02A
• Module Efficiency: 22.52%
• Max. Operating Voltage: 1500V DC
• Operating Temperature Range: -40°C to +85°C
• Dimensions: 1762 x 1134 x 30mm
• Cells: 96 (6x16)
• Protection Class IP68
• Connection: MC4
• Weight: 24kg