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As simple is hot-water with PV-excess

House illustration -hot-water with PV-excess

How AC ELWA works

The AC ELWA exclusively uses excess-energy from your PV-system and can be installed in hot-water boilers or storage tanks.

The excess-power is determined with a digital electricity-meter which sends the control variable to the AC ELWA(s).

The AC ELWA controls its power linear, so that as little enery as possible is fed into the grid and that your self-consuption is increased significantly. Grid-connected PV-systems reach only 30% self-consumption on average. For a typical household with a 3 kWp PV-system the self-consuption can be raised up to 89%.

This solution replaces devices with thyristors, which are not allowed in accordance with the requirements of the grid operators in Austria and Germany for power ratings above 200VA.

Stratification charge or synchronic charge possible for 6 AC ELWAs.

The desired water-temperature can be adjusted with a knob.

PV Excess Energy Hot-Water System - AC ELWA

Advantages

  • Linear power control 0 - 3.000W for maximum self-consumption
  • 3 - 18 kW power for each PV-system
  • Sinusoidal current consumption (no thyristor), grid compliant
  • Independent from the inverter
  • 3-phase electricity-meter included
  • Plug and play installation: no adjustment or programming required
  • Communication cable can be installed in normal AC cable channel
  • Hot-Water securing (Boost-Backup) included
  • Easy installation - perfect for retrofitting

System overview AC ELWA PV excess-management
One solution - many possibilities:

AC ELWA control with the PLA 3-phase-meter

 Schematic Illustration AC ELWA - AC ELWA control with the PLA 3-phase-meter

The PLA 3-phase electricity-meter measures the energy flow of the house and determines the energy-excess. If excess is present, it activates the AC ELWA and transmits the value of the available power.
The AC ELWA transformes this excess PV-energy to heat.

  • A PLA can control up to 6 AC ELWAs for stratification charge or synchronic charge simultaneously.
  • PLUG and PLAY: no adjustment or programming required when the AC ELWA is connected to the PLA
  • Communication cable can be installed in normal AC cable channel
  • Wiring diagram

AC ELWA control with 0-10V via Universal Interface

Schematic illustration AC ELWA - control with 0-10V via Universal Interface

The AC ELWA can be controlled via the Universal Interface with 0-10V signals by thrid-party providers.

  • Several AC ELWAs can be controlle simultaneously

Note: A Connection to the PLA is not possible.

AC ELWA control with RS485 via Universal Interface

Schematic illustration AC ELWA - control with RS485 via Universal Interface

The AC ELWA can be controlled and requested via the Universal Interface with RS485 control commands.

  • Several AC ELWAs can be controlled and requested in bus-mode individually via their adresses
  • Status information and hot-water temperature can be requested
  • Integration in smart-homes

AC ELWA control with Loxone IR Control Air via Universal Interface

Schematic illustration AC ELWA - control with Loxone IR Control Air via Universal Interface

The AC ELWA can be controlled wireless via the Universal Interface with IR signals of the Loxone IR Control Air.

  • Wireless control
  • Integration in smart-homes

 Note: With this configuration only one AC ELWA is possible in the system.

This solutions are not approved for the use with batteries!