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

Fothermo photovoltaic water boiler 200 liters – water heater
The Fothermo 200L water boiler uses solar energy to provide 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 DC heating rods provide a photovoltaic heating output of up to 1,800W.

Flexible inlets and outlets allow for individual installation, including the option of connecting a circulation pipe. Each boiler is supplied with pressure relief and check valves. The floor-standing boiler can utilize up to a total of 6000Wp of photovoltaic power. An existing heating system can be connected directly to the heat exchanger integrated in the boiler to ensure that sufficient hot water is available even on days with little sunshine.

Technical data 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: 74 kg
3 MPP trackers
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
Surface area: 0.90 m²
Volume: 4.3 liters
Continuous output according to DIN 4708: 25 kW
Flow rate according to DIN 4708: 10 L/min
Output according to EN 12897: 18.6 kW
Heating time according to EN 12897: 28.8 min
Pressure drop: 120 mbar
Photovoltaic heating
Max. current consumption: 16 A
Nominal electrical power: 1800 W
Max. connected power: 6000Wp
Max. connected power per MPPT: 2000Wp
Max. water temperature: 65°C
Max. open-circuit voltage: 50V
Reheating
The boiler can be reheated in various ways if there is insufficient sunlight. One option is to use an existing pellet, gas, or oil heater, which is connected to the boiler via the integrated heat exchanger. A temperature sensor in the boiler controls the reheating. Alternatively, an electric heating element with a 6/4 inch thread can be installed. The maximum water temperature is 65°C, and a heated 200-liter boiler can draw approximately 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. In addition, 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 case of shading
high cell efficiency of over 22.52%
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 (6×16)
Protection class IP68
Connection: MC4
Weight: 24 kg