MyEnergi Eddi User Manual

1. Introduction

Thank you for choosing Eddi. Eddi is an automatic power controller that tracks available surplus power from a grid-tied PV or Wind turbine system and varies the power to your heater to match the surplus, ensuring all green energy is utilised. These instructions will help you familiarise yourself with the Eddi for maximum benefit from this 'eco-smart' device.

varisine™ Technology

varisine™ is the proprietary power control technology used in Eddi. It enables the output voltage to be smoothly adjusted to alter the power to the heater, always maintaining a sine wave output. This technology ensures trouble-free operation with all inverters and compatibility with import/export energy monitors and electric meters.

2. Safety

The device is manufactured to state-of-the-art safety standards. Incorrect operation or misuse may result in:

• Injury or death to the operator or third parties
• Damage to the device and other property
• Inefficient operation

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.

3. Disposal

In accordance with European Directive 2012/19/EU on waste electrical and electronic equipment (WEEE), used electrical devices must be collected separately and recycled responsibly. In the UK, this is covered by The Waste Electric and Electronic Equipment (WEEE) Regulations 2013. Return your used device to your dealer or find information on a local, authorised collection and disposal system. Failure to comply may negatively impact the environment.

4. Copyright

Copyright of these operating instructions remains with the manufacturer. Text and images correspond to the technical level at the time of printing. MyEnergi reserves the right to make changes. Suggestions for improvement and error notices are welcome. myenergi zappi, myenergi eddi, and myenergi harvi are registered trademarks of myenergi Ltd.

5. Overview

Microgeneration systems are most efficient when generated energy is consumed on-site ('self-consumption'). Eddi is an energy management system for grid-tied PV or wind turbine systems that uses excess energy to heat water or rooms instead of exporting it to the grid. A supplied grid current sensor clips around the incoming cable to monitor excess power, allowing Eddi to automatically adjust voltage to the heater load. A self-powered wireless sensor (harvi) is available separately. An internal expansion interface allows for a Relay & Sensor Board (optional extra) for functions like day/night supply switching, heat pump interfacing, and temperature sensing. Eddi uses myenergi's proprietary varisine™ technology for worldwide power grid standard compliance.

Feature Set

• 3.68kW / 16A max. heater load
• Supports two heaters (sequentially)
• Integral bypass switch
• varisine™ PWM technology
• Fan-less cooling
• Built-in programmable boost timers
• Energy savings data logging
• Graphical back-lit LCD screen
• Overload and short-circuit protection
• Automatic Daylight Saving Time adjustment
• Relay & Sensor Board add-on option
• Wall mounting bracket
• Fully EMC and safety compliant (UKCA & CE)
• 3-year warranty
• Integrated WiFi for internet connection

5.1 Overview Diagram

The diagram illustrates the MyEnergi Eddi as part of a complete home energy management system, showing integration with other myenergi products, the grid connection, and the microgeneration system.

6. Box Contents

• 1 x Eddi unit with mounting bracket
• 1 x Current transformer with 5m cable (Grid CT sensor)
• 2 x Antenna
• 1 x Quick Start Guide
• 1 x vHub & WiFi Operation Manual
• 4 x screws (for cable clamps)

6.1 Optional: Relay & Sensor Board

This add-on board allows multiple wiring configurations and includes:

• Relays with a 16A capacity
• Two temperature sensor units (PT1000)
• eSense input (isolated detection for economy tariff)

The relays can be set independently or as a pair for functions including Export/Import Threshold, timed operation, de-stratification pump control, and BMS fault signals.

7. Operation

7.1 Controls & Indicators

The Eddi unit features several controls and indicators:

• 1. Display: Graphical LCD display with LED backlight.
• 2. Power 'ON' Indicator: Illuminates when the unit is connected to the mains and the ON/OFF/BYPASS switch is in the ON position.
• 3. Control Buttons: Four tactile buttons for menu navigation and settings adjustment: [Enter/Exit] (X), [Up] (↑), [Down] (↓), [Select/Confirm] (✔).
• 4. Heater Output Indicators (1 & 2): Illuminate when Heater 1 or Heater 2 is active, with brightness indicating output voltage. Both illuminated means both heaters are at maximum temperature.
• 5. ON/OFF and BYPASS Switch: Has three positions: [ON] for normal operation, [OFF] to power down the unit, and [BYPASS] to directly connect mains supply to Heater 1.

8. Display

The Eddi display provides key information:

• 1. Import/Export Power: Shows power flow to/from the grid (kW) with directional arrows. 0.0kW indicates the property is 'in balance'.
• 2. House Load Power: Displays the property's current power usage (kW), shown when a Generation Sensor is connected.
• 3. Operating Modes: Indicates the current operating mode.
• 4. Generation Power: Shows power generated by the microgeneration system (kW), displayed when CTs are connected.
• 5. Date & Time: Displays the current date and time.
• 6. Mode Icons: Icons indicate import limiting [house icon], Demand Side Response [~ icon], or eSense input active [e icon].
• 7. Eddi Icon: Represents the Eddi unit. Wavy lines above indicate thermal limiting, reducing output power.
• 8. Energy Diverted Today: Shows accumulated energy sent to heaters today.
• 9. Temperature: Displays the temperature of the active heater if probes are installed.
• 10. Heater Icon: Represents the active heater, with its number.
• 11. Power Diverting to Heater: An arrow indicates when Eddi is heating, shown with power in kW.

9. Operating Modes

• 9.1 Waiting for Surplus: Eddi waits for surplus power. The display shows the house icon with grid import (e.g., 0.8kW) and 0.00kWh accumulated energy.
• 9.2 Heating: Eddi diverts power to the heater. The display shows the Eddi icon, heater icon (e.g., 1) with diverted power (e.g., 1.6kW), and accumulated energy (e.g., 1.30kWh).
• 9.3 Max Temp Reached: The heater is at maximum temperature. The display shows a thermometer symbol and export power (e.g., 0.8kW). If a second heater is present, Eddi may switch to it.
• 9.4 Boosting: Eddi delivers maximum power to the heater, potentially drawing from the grid. The display shows boost duration (e.g., 1h00m), heater power (e.g., 3.0kW), grid import (e.g., 2.8kW), and accumulated energy.

10. Manual Boost

Manual Boost allows a heater to reach full power for a short period, regardless of available export power. The boost starts with a 1-hour duration, adjustable during the boost, and can be cancelled anytime.

10.1 Activating Manual Boost

1. From the main screen, press the [Select/Confirm] (✔) button.
2. If multiple heaters are connected, use the [Up]/[Down] (↑/↓) arrows to select the desired heater, then press [Select/Confirm] (✔) to start the boost.
3. During the boost, the duration can be altered using the [Up]/[Down] (↑/↓) arrows.

10.2 Cancelling Manual Boost

The boost can be cancelled by pressing the [Select/Confirm] (✔) button twice.

11. Boost Timer

Eddi can be programmed to 'boost' heating at specific times, operating at full power regardless of export power, potentially drawing from the grid. There are four editable time slots per heater. Setting duration to 0h00 makes the boost inactive.

11.1 Programming Boost Times

1. From the main screen, press [Enter/Exit] (X) to access the Main Menu.
2. Select 'Boost Timer' using the [Down] (↓) arrow and press [Select/Confirm] (✔).
3. Select the heater (e.g., Heater 1) using the arrows and press [Select/Confirm] (✔).
4. The 'BOOST TIMER' screen will appear, showing time slots, durations, and days.
5. Use the [Up]/[Down] (↑/↓) arrows to highlight a time slot to edit.
6. Adjust the start hour using the arrows, then press [Select/Confirm] (✔) to move to minutes.
7. Edit duration and days of the week similarly. Days can be toggled on/off using the arrows. Press [Select/Confirm] (✔) to move to the next day or confirm the slot.
8. Press [Enter/Exit] (X) to exit the 'BOOST TIMER' screen.

11.2 Economy Tariff Boosting

Boosting during economy tariff periods can be achieved in three ways:

1. Set the boost timer to coincide with economy tariff times (for dual-rate meters).
2. Boost only at set times AND when economy rate electricity is available.
3. Automatically boost whenever economy rate electricity is available, regardless of boost times.

*Options 2 and 3 require the eSense input on the optional Relay & Sensor Board. The 'e' icon on the BOOST TIMER screen indicates availability for option 2.

11.3 Boost Time Conflicts

If boost times conflict, the heater with higher priority takes precedence. For a single heater, conflicting boost times will follow the latest start time or longest duration.

11.4 Cancelling Boost

A boost can be cancelled by pressing the [Select/Confirm] (✔) button twice.

11.5 Boost Stop Mode

To temporarily disable scheduled Timed Boost (e.g., during holidays), go to Heater Settings > Stop Mode and press [Select/Confirm] (✔). To reactivate, go to Heater Settings > Stop Mode and press [Select/Confirm] (✔) to turn off Stop Mode.

12. Configuration Settings

Commonly altered settings are detailed below.

12.1 Time & Date

The correct time and date are crucial for the Boost Timer and savings calculations. Eddi retains time and date for several days during a power cut. Time is in 24-hour format; date format is changeable. Eddi automatically adjusts for Daylight Saving Time (DST) if Auto DST is enabled and the correct time zone is selected.

12.2 Priority

Heater output priority can be set to Heater 1 or Heater 2. The priority heater is heated first with surplus power. Eddi switches back to the priority heater if it cools down. The 'Check Period' setting determines how often the priority heater is checked. If the Relay & Sensor Board and temperature probes are used, Eddi will switch back to the priority heater if the temperature drops by more than the set Hysteresis.

12.2.2 Hot Cancel Delay

A delay can be set between switching from the priority heater to a lower priority heater. This 'Hot Cancel Delay' can be set from 0 to 61 minutes via Heater Settings > Boost > Select delay duration.

13. Advanced Settings

The Advanced Settings menu is passcode protected. The default passcode is 0000.

13.1 Supply Grid - Device Settings

13.1.1 Supply Grid – Phase: Used in 3-phase properties to match the Eddi's wiring phase for accurate measurements and response, especially with harvi sensors. Refer to 'Three-Phase Systems and Net Phases' for more information.

13.1.2 Supply Grid - Device Limit: Sets the maximum current Eddi will draw, useful for supply limitations like a 13A fused spur.

13.1.3 Supply Grid – Grid Limit: Sets the maximum import current from the grid connection. This is a global limit for all networked myenergi devices. For example, if a property has a 65A limit and is using 52A, Eddi will limit a 3kW heater to 1.8kW (8A) if the Grid Limit is set to 60A, preventing exceeding the total import current.

13.1.4 Supply Grid – Battery: Allows Eddi to integrate with AC battery systems. Settings include:

• None: No battery system installed.
• Limit to Gen: Limits Eddi output (except boosting) to prevent draining AC coupled batteries. Requires a CT for generation monitoring.
• Avoid Drain: Stops Eddi from draining the battery when using surplus power.
• Avoid Charge: Allows Eddi to take priority over the battery when charging from solar/wind.
• Avoid Both: Combines 'Avoid Drain' and 'Avoid Charge' functions.

13.1.5 Supply Grid – Net Phases: When enabled, readings from 3-phase devices are netted, allowing surplus generation on any phase to be used on any other phase.

13.1.6 Supply Grid – Exp Threshold: The minimum export level that must be exceeded before Eddi starts diverting power to heaters.

13.1.7 Supply Grid – Response Delay: Sets a delay before Eddi diverts power after the Export Threshold is met. This may be needed for AC-side battery systems to allow batteries to charge first.

13.1.8 Supply Grid – Export Margin: Sets a minimum export power level to be maintained while Eddi diverts surplus to heaters. Normally zero, but can be set higher if desired.

13.2 CT config

CT1 and CT2 inputs are configured based on connected CT sensors. The internal CT measures output current.

Note: Settings for harvi devices are found in the Linked Devices menu.

IMPORTANT: Only one Grid CT per phase is allowed.

CT Type

• None: No CT connected.
• Grid: Monitors property import/export power. Must be one Grid CT per phase.
• Generation Only: Monitors Solar PV or Wind generation.
• Storage Only: Monitors devices that store energy (e.g., third-party diverters), allowing Eddi priority. Power used by these devices is considered surplus unless they are using grid power. CT should be on the Live supply cable feeding the diverter, arrow pointing away.
• Generation & Battery: Monitors Solar PV or Wind generation with a DC-coupled battery.
• Monitor: Monitors any load (e.g., washing machine, lighting). Can limit current drawn by myenergi devices on a circuit.
• AC Battery: Used to monitor an AC-coupled battery, managing surplus energy distribution. CT should be on the battery inverter/charger's Live supply cable, arrow pointing away.

13.2.1 CT Groups

CTs can be grouped to net their readings, e.g., monitoring multiple solar PV systems. Use the CT Config menu to assign groups. Different CT Types cannot be in the same group. The first 4 groups support current limiting.

13.2.2 Group Limits

Current limits can be set for CT Groups to manage power draw. Devices must be 'linked' first (Section 14). Group limits are set on the master device. Multiple group limit types can be used.

Group Limit Examples:

• Limit current for two Eddi devices on a 20A supply: Uses internal CTs, Type: Internal, Group: IL1, Limit: 20A.
• Limit current for an Eddi device on a 25A supply also feeding another appliance: Uses CT2, Type: Monitor, Group: MN1, Limit: 25A.
• Limit current for two devices in a garage on a 40A supply: Uses CT2, Type: Monitor, Group: MN1, Limit: 40A. The second Eddi needs its CT input configured in the same Monitor group.

14 Linked Devices

Up to six myenergi devices can be wirelessly linked for better energy utilisation and control. Available devices include:

• Eddi: Microgeneration energy diverter for heating water/rooms with surplus power.
• Zappi: Eco-smart EV charge point using surplus power.
• Harvi: Self-powered wireless sensor for detecting grid conditions and generation power, simplifying installation.

Devices can be linked via built-in radio or Ethernet cable.

14.1 Master & Slave Devices

When linked, one device acts as the master, controlling slaves. Some settings (e.g., Grid Limit) are only changeable on the master. Choose the most accessible device as master. Harvi only pairs with the master device. It is recommended to set the device with the Grid CT connected as the master for fastest response.

14.2 Channels

To avoid interference from other appliances, the RF channel can be changed on devices without re-pairing, ensuring all devices are on the same channel.

14.3 Removing Devices

Devices can be removed via Advanced Settings > Linked Devices > Device > Remove Device. To remove all devices, use Advanced Settings > Linked Devices > Reset Settings.

14.4 Device Settings

Many settings for Eddi and Zappi (like priority) and Harvi (CT inputs) are accessed via the Linked Devices menu. Select Devices, then the device, and press [+] to access settings. Allow a few seconds for device updates after pairing; 'DEVICES UPDATING' will be shown.

14.5 Device Priorities

The priority of linked load-controlling devices can be set from any device with a display. The example shows one Eddi, two Zappi, and one Harvi. The priority is shown on the left (1 being highest). If priorities are equal, surplus is shared. The '~' symbol indicates the device with the Grid CT. A '?' symbol indicates lost communication.

14.6 Linked Devices Information

The 'LINKED DEVICES INFO' screen, accessible from the Main Menu, shows the status of all linked devices. It lists devices, their real-time output power, priority, and status.

15 Fault Codes

16 Warranty

Full warranty details are available on the myenergi website or via the QR code provided, linking to https://myenergi.com/product-warranty/.

17 Product Registration / myaccount

Register your myenergi devices, track energy usage, and manage flexible tariffs via the myenergi online account at myaccount.myenergi.com.

18.1 The myenergi app

The myenergi app for iPhone and Android allows control and monitoring of Eddi and other myenergi devices. It is free to download from the appropriate app store. More details are available on the website (www.myenergi.com).

18.2 The myenergi Forum

The user forum at www.myenergi.info is a platform for customers and installers to share experiences, provide advice, and discuss product development. Firmware updates and Q&A are also posted here.

19. Technical Support

For any issues during or after installation, contact technical support by scanning the QR code provided, or directly via https://myenergi.com/manual-support/ for the quickest solution.

20. Declaration of Conformity

myenergi declares that the Eddi microgeneration energy diverter complies with Directive 2014/53/EU. The full text of the EU declaration of conformity is available via the QR code provided.

Product Identification and Manufacturer Information

This section indicates your unique product identification. Eddi is designed and manufactured in the UK by myenergi Ltd, Pioneer Business Park, Faraday Way, Stallingborough, Grimsby, DN41 8FF. Contact: T: +44 (0)333 300 1303, E: sales@myenergi.com, W: myenergi.com.