80 l PV Water Heater

549,00 

incl. 19% VAT

Photovoltaic water heater for the kitchen or under the sink.

Description

The photovoltaic boiler offers the ideal solution for a cost-effective and independent hot water supply. Once installed, the boiler produces free hot water for years.

The 80 litre boiler is ideal for an economical 2-person household. The boiler can also be used in holiday homes, garden or mountain huts and in combination with instantaneous water heaters, oil or gas heating systems.

Installation:
Installation of the photovoltaic modules is very easy thanks to Plug & Play connections. The modules are plugged directly into the boiler via standard plug contacts (MC4). Optionally, an extension cable can be used to bridge longer distances between the photovoltaic modules and the boiler. (Photovoltaic modules and extension cables are not included in the scope of delivery, these can be purchased separately in the online shop).

Reheating:
In case there is not enough energy from the sun to heat the water for a longer period of time, the boiler can be automatically reheated via the optional 230V reheating device. To activate the reheating, a minimum temperature can be set on the boiler. This could be 35°C, for example. As soon as the water temperature falls below the set minimum temperature, the water is reheated via electricity from the mains. During the reheating phase, existing photovoltaic energy is also converted into heat. The reheating process ends automatically as soon as the water has reached the set minimum temperature again. fothermo recommends the 240 W power supply unit for the 80 litre water heater. (The reheating device is not included in the scope of delivery).

The maximum water temperature of the boiler is 65°C. When the boiler is completely heated, about 180 litres of 34-gram water can be taken from it. As a rule of thumb, 80 litres of hot water are available every day. Either by the power of the sun alone or with the support of the optional 230V reheater.

Product Highlights

550 Wp

Up to 550W heating power.

80 liter volume

Use up to 180 litres of hot water at 34°C water temperature for showering.

8 hours

Time the boiler needs to heat water from 20°C to 65°C at full heating power.

Digital Display

Check the savings and the current electricity consumption.

Easy Installation

Plug & Play connection of the photovoltaic modules for easy installation. 

MPP Tracker

Integrated MPP tracker for maximum solar yield.

Heating the boiler with a 12V or 24V battery

The photovoltaic boiler can be connected directly to a 12V or 24V battery via a separately available battery cable (can be found in the online shop). Depending on the battery voltage, the appropriate mode can be selected on the boiler. A list of all modes is shown below.

Primary energy source

Secondary power supply

Description

Mode 1

Solar panel

Primary energy source: Solar panel

External power supply unit

Secondary power supply: External power supply unit

Standard photovoltaic mode:

The boiler is heated via the directly connected photovoltaic modules.

Optionally, an external power supply unit (can be found in the online shop) can be connected to the boiler for automatic reheating of the water on days with low solar radiation.

Notice:
Mode recommended for the following boiler size: 10l, 30l, 80l

Mode 2

12V battery

Primary energy source: 12V battery

12V excess energy use

In mode 2, the battery is charged first. As soon as it is fully charged, the photovoltaic boiler uses the surplus energy to heat the water. The boiler switches on automatically when the battery voltage reaches 13.5V and stops heating when the voltage drops below 13.5V.

Notice:
Mode recommended for the following boiler size: 10l
Maximum heating power of the boiler: 79W
Approved battery types: LiFePO4, lead acid

Mode 3

12V battery

Primary energy source: 12V battery

12V reheating from the battery

In mode 3, the boiler can be reheated via the battery. In this case, the battery is discharged.
If the temperature of the water falls below a minimum water temperature set on the boiler (e.g. 30°C), the boiler uses the energy from the battery to heat up the water.

However, the battery is only discharged to a residual capacity of 50% to ensure that other electrical consumers such as lamps or a refrigerator continue to be supplied with sufficient power. The boiler stops the reheating process when a battery voltage of 12.4V is reached.

If, on the other hand, the water temperature in the boiler is higher than the set minimum water temperature, the battery is not discharged. In this case, the boiler would act as in mode 2 and only start the heating process when the boiler is fully charged.

Notice:
Mode recommended for the following boiler size: 10l
Maximum heating power of the boiler: 79W
Approved battery types: LiFePO4

Mode 4

External energy management

Primary energy source: External energy management

Energy management system

Mode 4 can be selected if the battery connected to the boiler has energy management. In this mode, the boiler is always activated and uses all the energy provided by the energy management system.

Example:
The energy management of the battery activates an electrical output from a state of charge of 80%. As soon as the electrical output is activated, the boiler uses all the energy until the electrical output is switched off again via the energy management system.

Notice:
The nominal voltage of the battery should be 12V or 24V..
Maximum heating power with 12V batteries: 79W
Mode recommended with 12V: 10l
Maximum heating power with 24V batteries: 316W
Mode recommended at 24V: 30l

Mode 5

24V battery

Primary energy source: 24V battery

24V excess energy use

In mode 5, the battery is charged first. As soon as it is fully charged, the photovoltaic boiler uses the surplus energy to heat the water. The boiler switches on automatically when the battery voltage reaches 27.0V and stops heating when the voltage drops below 27.0V.

Notice:
Mode recommended for the following boiler sizes: 10l, 30l, 80l
Maximum heating power of the boiler: 316W
Approved battery types: LiFePO4, lead acid

Mode 6

24V battery

Primary energy source: 24V battery

24V reheating from the battery

In mode 6, the boiler can be reheated via the battery. In this case, the battery is discharged.
If the temperature of the water falls below a minimum water temperature set on the boiler (e.g. 30°C), the boiler uses the energy from the battery to heat up the water.

However, the battery is only discharged to a residual capacity of 50% to ensure that other electrical consumers such as lamps or a refrigerator continue to be supplied with sufficient power. The boiler stops the reheating process when a battery voltage of 24.8V is reached.

If, on the other hand, the water temperature in the boiler is higher than the set minimum water temperature, the battery is not discharged. In this case, the boiler would act as in mode 5 and only start the heating process when the boiler is fully charged.

Notice:
Mode recommended for the following boiler sizes: 10l, 30l
Maximum heating power of the boiler: 316W
Approved battery types: LiFePO4

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Recommended photovoltaic power

Boiler volume:

10 Liter

30 Liter

80 Liter

Area I:

Area II:

100 Wp

300 Wp

300 Wp

600 Wp

600 Wp

800 Wp – 1200 Wp

Explanation: 
Area I: Southern Europe (e.g. Spain, Italy, Greece), Afrika, India, South East Asia
Area II: Central Europe (e.g. Germany, Switzerland, Austria), Northern Europe (e.g. Sweden, Norway)

Important:
All photovoltaic modules with an open circuit voltage Uoc of less than 42.4V can be connected to the photovoltaic boiler. These are usually all 60- or 120-cell photovoltaic modules. 72-cell and 144-cell photovoltaic modules can NOT be connected to the boiler, because then the boiler will be operated outside the safety extra-low voltage with a maximum of 42.4V and will lose its warranty. Suitable photovoltaic modules can be purchased in the online shop. 

More Highlights

100% renewable

Renewable heat supply through the power of the sun.

No registration needed

The photovoltaic modules do not have to be registered, as they do not feed into the grid. 

Made in Germany

Development and production of all boilers in Germany.

Scope of delivery

– 1x 80 liter photovoltaic boiler
– 1x instruction manual
– 1x relief and check valve

Download area more documents:

(data sheets, manufacturer’s instructions, declarations of conformity, installation videos, circuit diagrams, etc.)

Additional information

Weight 27 kg
Dimensions 47 × 51 × 91 cm
Model

PVB-80

Volume

80 l

IP class

IP 24

Gross weight (+/- 3%)

25 kg

Max Heating Power

550 W

Max. current

15.5 A

CE – certification

Yes

Max. current consumption

15,5A

Energy efficiency class

A+

Rated Pressure

7 bar

max. water temperature

65 °C

Water connection

G½ (M) (Standard 1/2 inch)

Adjustable water temperature range

10 – 65 °C

Integrated MPP tracker

yes

Integrated reverse polarity protection

yes

Digital display

yes

Boiler prepared for external reheating and battery connection

yes

Boiler made of steel with enamel coating

yes

Check and pressure relief valve

yes

Max. connected photovoltaic power

2500 Wp

Max. open circuit voltage

42.4 V

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