AC ELWA 2: Make the most of solar energy and increased self-consumption


AC ELWA 2 is a 0 - 3.5 kW linearly controlled water heating device for grid-connected photovoltaic systems and is the successor to our proven AC ELWA-E. In order to maximize the self-consumption of your current PV system, AC ELWA 2 harnesses the system's surplus photovoltaic energy to heat your water. Increasing self-sufficiency simultaneously safeguards against unpredictable or rising operating costs. The PV feed-in power can be regulated to zero by the linear control. 

Our trusted optional hot water backup function is included in AC ELWA 2: In the absence of sufficient sunlight, energy from the public power grid can be used to heat the water to the desired temperature. AC ELWA 2 can be installed in hot water and buffer storage tanks. 

Advantages of AC ELWA 2 over AC ELWA-E include:

  • More power: 3.5 kW as opposed to 3.0 kW

  • Very straightforward installation: Heating element and control unit can be installed one after the other

  • Ease of use thanks to the touchscreen display

  • Flexible control options: in addition to RJ45/Modbus TCP Ethernet, RS485/Modbus RTU, PWM-in, galvanically isolated relay contact

  • Integrated external temperature sensor

  • A second standard heating element can be controlled

  • Even more compact design than its predecessor 

  • No cable, fixed wiring and a shockproof plug

  • Transitioning from AC ELWA-E to AC ELWA 2 is simple

Tip Grid-connected PV systems often only reach a self-consumption level of 30%. With AC ELWA 2, self-consumption could be easily increased to 75% in a typical home (5kWp PV system). 


AC ELWA 2 in combination with my-PV WiFi Meter

In combination with my-PV WiFi Meter, AC ELWA 2 only uses surplus energy from your photovoltaic system. The heating power of the heating element is controlled linearly so that almost no energy is fed into the grid and your self-consumption reaches a maximum.

The connection to the router is made via a patch cable or wirelessly via WLAN.

More information about the my-PV WiFi Meter is available here.

AC ELWA 2 in combination with battery storage

AC ELWA 2 is compatible with many commercially available battery storage systems. It takes into account the optimal use and prioritisation of photovoltaic energy.

AC ELWA E Kilowatt Ueberschuss 2

The battery storage is always charged first. As soon as the battery is full, AC ELWA 2 takes over the storage of excess photovoltaic energy in the form of hot water. Water is the cheapest form of storage and can be perfectly complemented with chemical storage batteries. This way, the electricity you generate stays with you and is not fed into the grid.

Click here for the compatible manufacturers.


AC ELWA 2 in combination with Smart Home

Thanks to the open-system control, AC ELWA 2 also communicates with commercially available Smart Home and energy management systems. Control is carried out by the Smart Home system. This way, even complex control systems with priority setting by the consumers can be realised.

In residential buildings, systems with multiple devices work together on this basis. Remote monitoring and energy cost billing are possible at the apartment level.

Click here for the compatible manufacturers.

Tip Click here to see the projects which we have implemented with innovative partners. 

Advantages of AC ELWA 2

  • Self-consumption increases

  • Easy communication via network cable or WLAN

  • Heating power is linearly controlled

  • Installation in hot water and buffer storage tanks possible

  • System open for various inverters, battery systems and Smart Homes

Tip With our my-PV Power-Coach you receive an analysis of your self-consumption/own use with just a few details. 


Technical Data

Heat output 0 – 3.500 W + 16 A switch output
Mains connection 3-pin terminal, 2.5 mm2 230 V, 45 ‒ 65 Hz
Protection type IP21
Dimensions (W x H x D) 580 x 133 x 117 mm (with heating element)
Heating element length 460 mm (from the sealing)
Cartridge heater connection 1 1/2 inch
Displa​​y Color Graphic, Touch Screen 2.83“
Interfaces Ethernet RJ45, WLAN, RS485, PWM-in 3 ‒ 24V 0 ‒ 1 kHz, galvanically isolated relay contact
External temperature sensor 5 m


So that everything runs smoothly with AC ELWA 2


my-PV GmbH
Betriebsstraße 12
A-4523 Neuzeug

+43 7259 39328

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   Monday- Thursday: 8 am - 5 pm
     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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