Nexol NEX-R1 Energy Controller & Screw-in Heater for PV and Grid

With the Nexol screw-in heating element and Energy Controller (MPN: NEX-R1), you can use solar energy directly from your PV modules to heat water in a cost-effective and uncomplicated way. Additional reheating via the grid ensures that you always have a reliable hot water supply, even without high PV yields. The controller automatically switches between PV and grid power. Thanks to the control parameters for temperature, PV input power, and heating cycles, the supply can be precisely adapted to your individual usage behavior. For optimum efficiency, the heating element should be installed as low as possible in the storage tank. The system also does not require registration or approval, as the electricity generated is not fed into the grid. Ultimately, you have low investment costs, as cables are laid instead of pipes.

Your advantages and highlights

• Hot water generation using solar power
• Heating output of 1500W
• Secure hot water supply
• Legionella program
• Retrofitting existing systems - Compatible with 1.5" E-sleeve
• Heating support
• Smart touch display control
• Easy installation
• Plug & Play

How it works in detail

As soon as the sun shines, the PV modules generate electrical voltage and current flows through the Nexol Energy Controller. There, the current is conducted with low loss to the DC coil of the AC/DC screw-in heating element, which immediately begins converting the energy into heat and heating the storage tank. In bad weather or when the sun is not shining, the Energy Controller can also use mains power for additional heating.

That's why it's worth it

Depending on the energy source, there are different savings potentials. However, these can be clearly illustrated using the following key figures:

50% energy cost savings compared to gas boilers. That means savings of up to $150 per year.
75% energy cost savings compared to electric boilers. That's up to €300 in savings per year.
90% - Use over 90% of the solar power you generate yourself - maximum efficiency and savings for you.

Hot water supply

The system offers flexible settings for different user types. You can individually specify how often per day reheating takes place, to what temperature the water is heated, and at what PV output this occurs. If the maximum number of reheating cycles has not yet been reached, the temperature for supply has not been reached, and the incoming solar module output is too low, the grid takes over the reheating. This gives you full control and ensures that you always have sufficient hot water available.

Legionella program

To kill Legionella bacteria, the water in the tank must be heated regularly to at least 60°C. There is a standard program for this. The interval between heating cycles can be flexibly set to 1-14 days, with an interval of 7 days preset. The Energy Controller starts each interval after the last temperature of over 60°C has been reached. If this is not reached, the system automatically activates reheating via the mains.

Quick and easy installation

Simply connect the PV modules directly to the Nexol Energy Controller via MC4 connectors. The controller is also supplied with power via a conventional mains plug. After installation, the screw-in heating elements in the hot water tank can be easily connected to the controller via a plug. This allows you to benefit from environmentally friendly and cost-efficient hot water in no time at all.

Technical data

Energy Controller

• Display: 2.8" color touch display
• Ambient temperature range: 5°C - 40°C
• Humidity: 10-95% non-condensing
• Permissible degree of contamination: 1
• Protection class: IP21
• Weight: 2.4 kg
• Dimensions: 339 x 177 x 104 mm

Heating element

• Number of elements: 1
• Max. heating power: 1.5 kW
• Screw-in depth: 350 mm
• Protection class: IP65
• Screw-in thread: 1.5"
• Unheated area: 100 mm
• Max. tightening torque Screw-in thread: Brass/60 Nm
• Wrench size: 60 mm
• Max. operating pressure: 1MPa = 10bar
• Dimensions: 89 x 89 x 500 mm
• Electrically insulated

Photovoltaic specifications

• Recommended installed PV power: 2.5 kW
• Max. usable power: 1.5 kW
• Min. PV nominal voltage: 100V
• Max. PV open-circuit voltage: 300V
• Max. PV short-circuit current: 15A
• PV connections_ MC4
• MPP tracking included

Grid connection (optional)

• Power: 1.5kW
• Input voltage: 230V
• Input frequency: 50-60Hz
• Fuse protection: 10-16A

Scope of delivery:

1x Nexol NEX-R1 Energy Controller
1x screw-in heating element for PV and mains