Item number: 4273
EAN: 4250497820223

my-PV AC ELWA 2 hot water heater

AC ELWA 2 is a 3.5 kW continuously controlled water heating device for grid-connected photovoltaic systems

The AC ELWA 2 communicates via Ethernet/ WiFi, RS485 or PWM-in with battery storage or smart home solutions and minimizes the feed-in of solar energy by using excess energy to heat hot water. The battery system and electrical consumers have priority. Decentralized storage and hot water preparation avoid the usual distribution losses, while at the same time providing hygienic hot water preparation.

With AC ELWA 2

  • turn self-generated electricity into hot water
  • Infinitely variable control 0 - 3500W +16A switching output for maximum self-consumption
  • increase your self-consumption rate to over 75%
  • they produce hot water despite a power failure
  • avoid energy losses and downtime problems
  • intelligent communication with energy management systems and battery storage
  • optimal PV use with battery and water storage
  • Cheaper and easier than solar thermal systems

Choose tax zone / country of delivery

874,98 €

including 19% VAT.

Shipping time: 41 - 42 workdays
Available from: 30.07.2024 (Pre-order is possible)

AC ELWA-E photovoltaic water heating device

AC ELWA 2 communicates with the house's energy management system or the battery management system. As soon as excess energy is detected or the manager releases the AC ELWA 2, energy is stored in the hot water. With this, 10 - 20 kWh additional storage capacity can be realized easily and cheaply. The installed battery storage or the energy management system can be selected in an easy-to-use web interface. The desired hot water temperature can be set with a rotary knob.



  • Heating element with already integrated power electronics
  • AC ELWA 2 uses energy that can no longer be stored in the battery storage
  • Infinitely variable control 0 - 3,500W + 16A switching output for maximum self-consumption
  • The AC ELWA 2 communicates with the battery management system via Ethernet / WiFi / RS485 and PWM-in 3-24V
  • Sinusoidal current consumption (no thyristor), conform with TAB/TAEV
  • Suitable for numerous storage and smart home energy management systems
  • Open system for various inverters, battery systems and smart homes
  • Can be installed in hot water and buffer tanks
  • Easy to use thanks to the display like the AC-THOR

For compatible storage and management systems see:



Performance  0-100% linear, HF clocked
Heating power     0-3500W
Power Connector 3 pin terminal, 2.5mm² 230V, 45-65Hz
Interfaces Ethernet RJ45, WLAN, RS485, PWM-in 3-24V, potential-free switching output
Standby consumption
Efficiency  >99% at rated power
Cos Phi 0.999 at rated power
degree of protection IP21
Operating temperature range 10°C to 40°C (enclosure ambient temperature)
Display Color Graphic Touch Screen 2.83"
Installation position horizontally
Dimensions (W/D/H) 580 x 133 x 117mm with heater
Weight 2kg
Heater rod length 46 cm (from sealing surface)
Heater cartridge connector 1 1/2 inches
Certificates CE, TOR D1, TAEV, TAB
Warranty 2 years





Datenblatt AC ELWA 2 A4 DE

Datasheet AC ELWA 2 A4 EN

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