2.58kWp solar system with 300L Fothermo boiler for hot water preparation

The Offgridtec 2.58kW solar system with 300l Fothermo boiler (MPN 018920) offers a comprehensive solution for your hot water supply. It includes 6 bifacial solar modules from Luxen Solar, each with a power output of 430Wp, as well as all necessary cables to ensure a smooth installation. The photovoltaic stand boiler features an integrated heat exchanger for environmentally friendly hot water provision and can be seamlessly connected to existing heating systems.

You can use hot water in the sink, shower, or kitchen without needing to connect to the power grid. Thanks to the plug-and-play principle, the installation of the solar system can be done with just a few easy steps.

Components of the Offgridtec 2.58kW Solar System with 300l Fothermo Boiler

• 6x Luxen Solar 430W TopCon Bifacial Solar Module Full Black Luxneri Series N5
• 1x Fothermo 300 Liter Photovoltaic Boiler
• 3x Offgridtec 2-way branching connectors with cable extensions (pair)
• 3x connection cables MC4 to MC4 6mm² 10m red/black

Fothermo Photovoltaic Water Boiler 300 Liters - Water Heater

The Fothermo 300L water boiler utilizes solar energy for cost-effective and environmentally friendly hot water. With three independently operating photovoltaic heating rods, it delivers hot water quickly and reliably. The 3 MPP trackers and direct current heating rods ensure a photovoltaic heating capacity of up to 1,800W.

Flexible inlet and outlet options allow for individual installation, including the possibility of connecting a circulation line. The boiler comes with overpressure and non-return valves. The stand boiler can utilize a total photovoltaic capacity of up to 6000Wp. The integrated heat exchanger allows for direct connection to an existing heating system, ensuring sufficient hot water availability even on cloudy days.

Technical Data for Fothermo 300L Water Boiler

• Volume: 300 liters
• Max. heat loss: 50.2W
• Nominal pressure: 0.8 MPa
• Dimensions: 1605 x 670 x 760 mm
• Weight: 88kg
• 3 years manufacturer warranty
• 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
• Area: 1.12 m²
• Volume: 5.4 liters
• Continuous output according to DIN 4708: 35kW
• Flow rate according to DIN 4708: 14 L/min
• Output according to EN 12897: 19.3kW
• Heating time according to EN 12897: 39.4 Min
• Pressure drop: 50 mbar

Photovoltaic Heating

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

Additional Heating

The boiler can be supplemented with various heating sources in case of insufficient sunlight. One option is to use an existing pellet, gas, or oil heater 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 6/4 inch thread can be installed. The maximum water temperature is 65°C, and a heated 300-liter boiler can supply about 675 liters of water at 34°C.

The Bifacial Luxen Solar 430W Full Black Solar Module

The monocrystalline and bifacial 430W Full Black solar module from the Series N5 by Luxen Solar (MPN LNVB-430ND) impresses with a combination of various technologies, such as N-TOPCon cell technology and a 108-cell half-cell layout. For enhanced performance, the production process also utilizes SMBB half-cut cell technology. This state-of-the-art solar module represents the pinnacle of solar technology, providing impressive output and low levelized cost of electricity (LCOE).

• 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
• 30 years performance warranty and 15 years product warranty
• High cell efficiency of over 22%

Technical Data

• Max. power: 430W
• Module voltage (Vmp): 32.04V
• Max. current (Imp): 13.42A
• Open-circuit voltage (Voc): 38.96V
• Short-circuit current (Isc): 14.13A
• Module efficiency: 22.02%
• Dimensions: 1722 x 1134 x 30 mm
• Operating temperature range: -40°C to +85°C
• Cells: 108 (6x18)
• Protection class IP68
• Max. operating voltage: 1500V DC
• Weight: 23.5kg