1. Introduction
  2. Safety
  3. Overview
  4. Box Contents

1. Introduction

Thank you for choosing eddi. Of course, we think you have made an excellent choice and are sure you will be very happy with the features, benefits and quality of this myenergi product.
eddi is an automatic power controller for heaters. It ‘tracks’ available surplus power from a grid-tied PV or Wind turbine system and varies the power to the heater to match the surplus power, therefore ensuring all of the green energy is fully utilised.These instructions will help you to familiarise yourself with the eddi, by reading the instructions, you will be sure to get the maximum benefit from this ‘eco-smart’ device.

varisineTM Technology

varisineTM is the proprietary power control technology used in the eddi. The technology enables the output voltage to be very smoothly adjusted in order to alter the power to the heater. The power to the heater is always a sine wave and only the voltage is altered.
This control technology is more sophisticated than many other products on the market and the technology ensures trouble free operation with all inverters and compatibility with all import/export energy monitors and electric meters.

2. Safety

The device has been manufactured in accordance with the state of the art and the recognised safety standards. However, incorrect operation or misuse may result in:

Injury or death to the operator or third parties.

Damage to the device and other property of the operator.

Inefficient operation of the device.


All persons involved in commissioning, maintaining and servicing the device must:

Be suitably qualified and competent.

Have knowledge of and experience in dealing with electrical installations.

Read and follow these operating instructions carefully.

Always disconnect the device from the supply before removing the cover.


The device is not to be used by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the device by a person responsible for their safety.

Be aware that the heat sink (at the rear of the device) can on occasion reach high temperatures.


In accordance with European Directive 2002/96/EC Waste Electrical and Electronic Equipment (WEEE) and its implementation in national law, used electrical devices must be collected separately and recycled in an environmentally responsible manner. Ensure that you return your used device to your dealer or obtain information regarding a local, authorised collection and disposal system. Failure to comply with this EU Directive may result in a negative impact on the environment.


Copyright of these operating instructions remains with the manufacturer. Text and images correspond to the technical level at the time of going to press. We reserve the right to make changes. The content of the operating instructions shall not give rise to any claims on the part of the purchaser. We are grateful for any suggestions for improvement and notices of errors in the operating instructions.


3. Overview

Microgeneration systems such as Solar PV and small wind turbines are at their most efficient when the generated energy is consumed on-site rather than exporting it to the grid. This is what we call ‘self-consumption’.

eddi is an energy management system for use with grid-tied PV or wind turbine systems. Excess energy from the microgenertation system is used to heat water or rooms rather than exporting it to the grid.

A grid current sensor (supplied) simply clips around the incoming supply cable. This sensor is used to monitor excess power and eddi automatically adjusts the voltage to the heater load, thereby consuming the surplus power. A self-powered wireless sensor (harvi) is available separately.

An internal expansion interface provides a means to install a Relay & Sensor Board to enable various functions such as auto switching from day-time and night-time supply, heat pump interfacing for Legionella control and temperature sensing.

eddi utilises myenergi’s proprietary varisineTM technology to ensure compliance with worldwide power grid standards.

Feature Set

–   3.68KW / 16A max. heater load

–   Supports two heaters (sequentially)

–   Integral bypass switch

–   varisineTM PWM technology

–   Fan-less cooling

–   Built-in programmable boost timers

–   Energy savings data logging

–   Graphical back-lit LCD screen for ease of use

–   Overload and short-circuit protection

–   Automatic Daylight Saving Time adjustment

–   Relay & Sensor Board add-on option

–   Wall mounting bracket for ease of installation

–   Fully EMC and safety compliant (CE)

–   3-year warranty

Overview Diagram

This diagramshows the eddi as part of a complete energy management system. Other myenergi products are shown and how they integrate with the grid connection and the microgeneration system.


4. Box Contents

–   1x eddi unit with mounting bracket attached

–   1x Current Transformer with 5m cable (Grid CT sensor)

–   1x Antenna

–   1x Operation & Installation Manual