ELWA: Use solar power only for hot water


ELWA is a 2 kW photovoltaic water heating device. Direct current from photovoltaic modules is transferred directly to the built-in heating element and immediately converted into heat without loss. The built-in MPP Tracker ensures that the PV generator is always operated at the optimum operating point (similar to a PV inverter).

For operation, no connection to the mains is required as the unit is powered by the PV generator (pure off-grid operation). The desired DHW temperature is set with a rotary knob, LED displays inform about the current device status.

Would you like a short introduction to ELWA?

As the video is in German just activate the English subtitles on youtube.

Hot water always available, even during bad weather.

Due to the patented boost-backup function, hot water supply can be guaranteed even during bad weather. This makes it possible to completely switch off the conventional heating system in summer. This also increases its lifespan.

For commissioning the boost-backup function, ELWA can be easily connected to a mains socket. There is no feed-in into the grid, so it does not need a metering point like a grid-connected PV system.

Tip With our my-PV Power-Coach you can easily and quickly get a personal analysis of your system.


Your advantages with hot water from photovoltaics

  • Easier and cheaper than thermal solar systems

  • No grid operator approval required: You save yourself tedious administrative work, because ELWA does not feed electricity into the grid. Especially in multi-storey apartment projects, the approval can take several months for grid-connected PV systems.

  • Easiest installation with "cables instead of pipes", less valuable copper, no maintenance costs.

  • Stratification-heating possible with 2 devices.

  • Even works in case of power failure.

  • Boost-backup optionally usable.

  • No anti-freezing liquid necessary

  • Cables have almost no energy loss compared to pipes

Tip Further advantages can be found here.



Data evaluation with USB interface

ELWA has an integrated data logger. With the USB interface and the free ELWA software, you can read out your solar yields and see, for example, the temperature increase of your hot water. In addition, device settings can be easily customized for your individual needs.

Remote monitoring with Modbus interface

In case that several devices are to be controlled and monitored from a central location, my-PV has developed a suitable Modbus interface. This solution is particularly suitable for apartment projects. In addition, a further temperature sensor can be integrated into the controller.

Technical data

DC nominal power 0 - 2000 W with MPP tracking
DC inputs 1 string, 100 - 360 VDC, MC4
AC boost power 750 W for boost-backup
Mains connection Single-phase, grounded plug, 230 V, 50 - 60 Hz
Dimensions (WxHxD) 130 x 190 x 600 mm with heating element
Protection class IP 21


So that everything runs smoothly with the ELWA


my-PV GmbH
Betriebsstraße 12
A-4523 Neuzeug

+43 7259 39328

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     Friday: 8 am - 2 pm


About us


We at my-PV get more out of photovoltaics than just electricity, we move your building technology into the future. Use your solar power yourself instead of feeding it into the public grid: Electricity, hot water, heating and charging options for your e-car. With our products, you can use your self-generated photovoltaic electricity for your own needs without any detours. This way, you save costs in the long term and act environmentally friendly!



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