MY-PV AC ELWA-E Solar PV Off-Grid Water Heater

 The MY-PV AC ELWA-E Solar PV Off-Grid Water Heater – An ingeniously simple solution. Smart-Homes and photovoltaic storage systems are all the rage. Hardly anyone thinks about the fact that typical PV-systems produce far more energy a day than can be consumed in the house. That means that the battery is fully loaded and that excess-power goes to the grid afterwards.

This is exactly the starting-point for the AC ELWA-E: It communicates with the energy-management system of the building or the battery-management-system. As far as excess energy is detected respectively the management-system clears the AC ELWA-E, energy is stored in hot-water. In this way we can easily add 10 – 20 kWh of extra storage capacity.

In a simple web-interface the installed battery respectively the energy-management-system can be selected. The desired water-temperature can be adjusted with a knob.

The main features of the MY-PV AC ELWA-E Solar PV Off-Grid Water Heater

• AC ELWA-E uses energy that cannot be stored in the battery
• Linear power control 0 – 3.000W for maximum self-consumption
• The AC ELWA-E communicates via ethernet with the BMS
• Sinusoidal current consumption (no thyristor), grid compliant
• Hot-Water securing (Boost-Backup) included
• Suitable for the following battery and energy-management-systems

AC ELWA-E control via Modbus Meter Interface

In case that the installation of the battery or the management-systems should happen at a later stage, but the activation of the AC ELWA-E has already to be made, my-PV has developed an appropriate transitionsolution. The Modbus Meter Interface is a link between the AC ELWA-E and the electricity-meter EASTRON SDM630 Modbus. The electricity-meter detects the amount of the excess energy.