1) Status symbols

 2) The top bar shows the current date, time, unit number and operating mode.

3) Temperature reading(s) and sensor number. If the external temperature sensor T2 is connected, two temperature values are displayed.

To set the target temperature for heating with PV surplus, tap the lower temperature display Tmax (solar) and use the up and down arrow buttons on the right edge of the screen. Then save the settings with the button below.

To set the target temperature for the optional temperature safety setting, tap the upper temperature display Tmin (Boost) and proceed in the same way.

4) Current power output.

In operating mode M3, the power bar is automatically extended by the additional power at the AUX relay.

5) The button "Single-Boost" appears when a backup mode is activated. Pressing the button starts a single backup operation. This can also be deactivated again while the operation is running.

If the backup takes place automatically due to the day of the week, time and temperature, it cannot be deactivated via the button.

6) In operating mode M1, the status of the AUX relay is displayed if the "Activate AUX relay for heat output" setting is enabled. See the chapter "Special Configuration Options in the Web Interface."

In operating mode M3, the status of the AUX relay is displayed.

7) See chapter "Data logger” (internal on device). This is to be distinguished from data recording in the cloud live.my-pv.com. See chapter "Cloud mode".

8) See chapter „Status information on the display“

9) The "Home" button always returns you to the home screen.

10) Settings
See chapter "General settings" for general unit settings, also chapter "Operating modes" for settings specific to the respective operating mode.
In addition, there are unit settings that can only be made in the web interface, but not on the display. See chapter "Special settings on the web interface"

11) Help
When pressed, the display shows brief information about the current view. In the web interface, the button leads to the documents on the AC ELWA 2 on the my-PV homepage.

2.2 Data logger (internal on device)

The internal data logger is to be distinguished from the online data recording in the cloud live.my-pv.com. See chapter Cloud Mode.

Recorded performance data, meter values and temperatures can be viewed at any time. The respective values can be selected via the "Open" button. Using the "Calendar" button, these can be displayed in the three views of the current year, month or day.

The following data can be displayed:

Total power: Shows the sum of the power values of AC ELWA 2 and heating rod at the AUX relay. The orange bars show the PV excess power used, the pink bars show the share of grid energy when using the optional temperature boost backup or the legionella mode.

Meter: indicates the value of the total power drawn from the grid (blue) including household loads and grid feed-in (orange) at the feed-in point.

Power 1: shows the power data for AC ELWA 2.

Power 2: shows the power data for the heating rod at the AUX relay.

Temperature 1 and 2: shows the data of the temperature probes.

2.3 Status information on the display

The data of all variables relevant to the operation are shown in a list.

Power: shows the total power output of AC ELWA 2.

Meter: shows the current data for the meter at the measuring point. A positive value shows drawing from the grid, a negative value, feeding into the grid.

PV: If a corresponding measuring point has been set in the Web-Interface under Setup, the value of the PV power is available here. See Measurement Settings.

Temperature 1: Current measured value of internal temperature sensor T1

Temperature 2: Current measured value external temperature sensor T2

Power 1: Current power at the heating element of the AC ELWA 2

Power 2: Current power at the external heating rod at the AUX relay

IP: shows the current IP address of AC ELWA 2.

Ctrl IP: shows the current IP address of the signal source. Shown in addition in the line below is the designation of the signal source and the current measured value. A positive value shows drawing from the grid, a negative value, feeding into the grid.

Status: Shows the unit's current status.

Mains voltage: shows the current input voltage.

Frequency: shows the current grid frequency.

Temperature power stage: shows the current temperature of the power electronics.

Fanspeed: shows the current speed setting of the internal fan.

Serial: shows the unit serial number.

MAC: shows the MAC address of the unit.

Hardware version: Shows the status of the installed hardware.

Version: shows the current firmware version of the controller.

Version Co: shows the current firmware version of the co-controller.

Version PS: shows the current firmware version of the power stage.

Device number: shows the unit number set. This is also visible on the home screen.

Mode: shows the operating mode set. This is also visible on the home screen.

SEV relay state: shows the current status of the switch output (0 or 1).

AUX relay state: shows the current status of the switch output (0 or 1).

Cloud Status: Regardless of whether the cloud mode is active or not, it is displayed whether the cloud server is reachable. If the info "99, Timeout" is displayed at this point, please send the 16-digit serial number to support@my-pv.com.

3.1 Possible Controls

3.1.1 my-PV WiFi Meter: Instructions can be found here

3.1.2 Compatible manufacturers:

Instructions can be found here

Further preset controls (without separate instructions) are listed here:

3.2 Frequency control

Can only be set if the system requirements are met.

3.2.1 Explanation

In AC offgrid systems, battery inverters can change the grid frequency depending on the battery's state of charge. With frequency control, the AC ELWA 2 is thus given the power via the power grid connection. Wiring for communication is not required!

As soon as frequency control is selected as the signal source, the measured value is shown on the display at the bottom right above the help button.

3.2.2 System requirements

Hardware version: 1.5A or higher
Firmware version: e0000600 or higher
Power stage firmware version ep102 or higher

3.3 PWM control with 3 - 24 V DC voltage from external source

The AC ELWA 2 can also be operated via an external PWM signal with variable power. The corresponding signal input is located at the 8-pin connector to which the external temperature sensor T2 is also connected.

This control is independent of the selected operating mode. If a PWM signal is present, all other control signals that might be available are also overridden.

If the boost backup mode is set, it remains valid.

As soon as a PWM signal is present, it is displayed in percent on the bottom right of the display above the help button.

4.1 M1: Hot water 3,5 kW

4.1.1 Explanation

In this operating mode, the heating rod at the electronics until is linearly powered with PV surplus until the target temperature is reached at the internal sensor T1.

4.1.2 Optional boost backup

Optionally, the AC ELWA 2 can also maintain a minimum temperature. Two boost modes are available in operating mode M1. See "Specific settings for operating mode M1".

4.1.3 Specific settings for operating mode M1

Hot water 1 temperatures

The maximum temperature that may be reached at the internal temperature sensor T1 due to PV excess can be set (factory setting 60°C).

If the optional automatic temperature boost backup is shown "On" in the window on the right (factory setting "Off") or the “SELV relay” output has been selected, a minimum temperature can then be set (factory setting 50 °C).

Automatic temperature boost backup "On":
When active, the heating rod at the electronics is supplied with maximum power. This can lead to current being drawn from the mains or to a battery discharging!

Automatic temperature boost backup "SELV relay":
Alternatively, the minimum temperature can be maintained by enabling an external heat source. Enablement is by means of a potential-free contact. For details of wiring the potential-free contacts, please refer to the assembly instructions in the chapter "Wiring diagram Mode M1".

The external temperature sensor T2 is always required for the "SELV relay" backup mode and it must always be installed on the storage tank above the AC ELWA 2 to provide a usable measurement result!

Hot water 1 min switching times

This setting can be selected when the boost backup is not "Off" under "Hot water 1 temperatures".

There are two time windows available to maintain the minimum temperature. Start and finish can each be defined at full hours. Factory settings suggest switching times of 5 to 11 pm and 5 to 7 am.

Hot water 1 min weekdays

This setting can be selected when the boost backup is not "Off" under "Hot water 1 temperatures".

You can select the weekdays on which the minimum temperature has to be maintained. In the factory settings, all weekdays are activated.

Legionella program

For ensuring drinking water hygiene, a period can be specified by the end of which a set minimum temperature must again be reached at the internal sensor T1 after the last time it was reached. The number of days in this period can be set between 1 and 14. A time at which the legionella program is to start can also be specified. Factory settings are number of days 7, starting time 8 pm, temperature is 60 °C, the legionella program is "Off".
The AC ELWA 2 is supplied with maximum power until the legionella temperature at the internal sensor T1 is reached. This may result in current being drawn from the mains or a battery discharging!

4.2 M3: Hot water 3,5 + 3 kW

4.2.1 Explanation

In this operating mode, another heating element is supplied with PV surplus in addition to the AC ELWA 2 until the target temperature is reached at the internal sensor T1. Only the AC ELWA 2 can adjust the power output linearly, the other heating element is switched on as soon as sufficient surplus is available. If this is the case, the AC ELWA 2 starts power control again from 0. The total control range is thus extended.

The heating element is switched on for the first time when a surplus level of 3 kW is exceeded. As soon as a measured value of the load is available, this is taken into account as the switching threshold in further operation!

If the nominal power at the switched load is reduced at a later time (e.g. due to a modification of the system), it is necessary to reset to factory settings.

4.2.2 Optional boost backup

Optionally, the AC ELWA 2 can also maintain a minimum temperature on the external sensor T2. Three boost modes are available in operating mode M3. See "Specific settings for operating mode M3".

4.2.3 Specific settings for operating mode M3

Hot water 1 temperatures

Adjustable is the maximum permitted temperature to be reached at the internal temperature sensor T1 (factory setting = 60 °C).

If the optional automatic temperature boost backup is shown "On" in the window on the right (factory setting: Off), or the setting "SELV relay" or "AUX relay" has been selected, then a minimum temperature can also be set (factory setting: 50°C).

Automatic temperature boost backup "On":
When active, the heating rod at the electronics and the heating element on the AUX relay are supplied with maximum power. This can lead to current being drawn from the mains or to a battery discharging!

Automatic temperature boost backup "SELV relay":
Alternatively, the minimum temperature can be maintained by enabling an external heat source. Enablement is by means of a potential-free contact. For details of wiring the potential-free contacts, please refer to the assembly instructions in the chapter "Wiring diagram Mode M1".

Automatic temperature boost backup "AUX relay":
As a third possibility, the minimum temperature can also be maintained only by the switched heating element on the AUX relay. This can lead to current being drawn from the mains or to a battery discharging!

Hot water 1 min switching times

This setting can be selected when the boost backup is not "Off" under "Hot water 1 temperatures".

There are two time windows available to maintain the minimum temperature. Start and finish can each be defined at full hours. Factory settings suggest switching times of 5 to 11 pm and 5 to 7 am.

Hot water 1 min weekdays

This setting can be selected when the boost backup is not "Off" under "Hot water 1 temperatures".

You can select the weekdays on which the minimum temperature has to be maintained. In the factory settings, all weekdays are activated.

Legionella program

For ensuring drinking water hygiene, a period can be specified by the end of which a set minimum temperature must again be reached at the internal sensor T1 after the last time it was reached. The number of days in this period can be set between 1 and 14. A time at which the legionella program is to start can also be specified. Factory settings are number of days 7, starting time 8 pm, temperature is 60 °C, the legionella program is "Off".
The AC ELWA 2 and the heating element on the AUX relay are supplied with maximum power until the legionella temperature at the internal sensor T1 is reached. This may result in current being drawn from the mains or a battery discharging!

IP address: can only be set when "Static IP" has been selected and there is no direct connection to the my-PV Power Meter (meanwhile replaced by my-PV WiFi Meter).

Subnet mask: can only be set when "Static IP" has been selected and there is no direct connection to the my-PV Power Meter (meanwhile replaced by my-PV WiFi Meter)..

Gateway address: can only be set when "Static IP" has been selected and there is no direct connection to the my-PV Power Meter (meanwhile replaced by my-PV WiFi Meter).

DNS server: can only be set when "Static IP" has been selected and there is no direct connection to the my-PV Power Meter (meanwhile replaced by my-PV WiFi Meter).

Display timeout: the number of seconds elapsing until the display is turned off can be set. A value between "10" and "250" seconds can be entered.

Display brightness: brightness of the display can be adjusted in ten steps.

Logo brightness: brightness of the illuminated my-PV logo on the unit can be adjusted in ten steps. "0" indicates that the logo will not be turned off.

Control source: In this section, the selection of the control is made. See the enclosed Quick Start Guide or the chapter "Commissioning".

Ctrl IP: The IP address of the signal source can be selected manually. For example, this is necessary when there are several compatible sources in the network and a special one of them should be chosen as the control system.

Control target power: The setpoint value of the power at the measuring point is specified here. A negative value means grid feed-in. A target value of -50 W is preset at the factory. This parameter can be freely selected in the range between -9999 and +9999 W.

Mode: Detailed description will be found in the chapter "Operating modes".

Language: In addition to German and English, other languages will be available in the future.

Device number: Each AC ELWA 2 has the number 1 ex works. Higher unit numbers only have to be assigned in multi-mode (see Special setting options in the web interface).

Max. power: This setting can be used to limit the power at the heating element. The value can be set on the display between 17 - 100 percent.

This is necessary, for example, if other loads are connected to the same circuit as the AC ELWA 2. In this way, you can prevent the fuse from blowing.

Power timeout: With this setting, the timeout of the AC ELWA 2 (power timeout) can be set for several control types.

Hysteresis: Switching hysteresis for hot water can be set. These do not cause an increase at the target temperature! After reaching the target temperature, however, the value may drop by the set amount before the heating process is restarted.

Hot water maximum temperature (factory setting 3.0 °C)
Hot water minimum temperature (factory setting 3.0 °C)

Check for new firmware: This option is not yet available in this firmware version.

When a new version is available, the following buttons are displayed.

eXXXXXXX Download
The download may take several minutes. Do not interrupt the process!

eXXXXXXX Installation
After the installation, the unit will automatically restart.

ecYYY Download and installation
After installation, the machine will automatically restart.

epZZZ Download and installation
After installation, the machine will automatically restart.

Factory reset:
Factory reset: tapping on the menu point resets the AC ELWA 2 to its factory settings. This will cause all altered settings in the unit to be deleted!
CAUTION! No security confirmation is requested!

Debug mode: To analyse control problems, the debug mode can be activated in coordination with support@my-pv.com.

WiFi password: This option can be selected if "WiFi" is already selected in "Ethernet mode" (next menu item).
An automatic search for available networks is carried out. After the selection, you will be asked to enter the WiFi password. Press the shift key and the "123?" key to use additional special characters.

Ethernet mode: There are three options to choose from:

Ethernet

The AC ELWA 2 is connected to the router via a network cable. Two green arrows appear at the top right of the home screen as soon as the connection is established.

WiFi

The AC ELWA 2 is connected to the router via WiFi.
An automatic search for available networks is carried out. After the selection, the WiFi password is entered. Press the shift key and the "123?" key to use additional special characters.
As soon as the connection is established, a WiFi symbol appears in the top right-hand corner of the home screen (including a display of the signal strength).

WiFi Access Point

The AC ELWA 2 can set up an access point to which WiFi-capable devices can connect.
The WLAN password is: administrator
The IP address of the AC ELWA 2 is 11.11.11.2.
A WiFi symbol with the letters "AP" appears at the top right of the home screen.

Cloud mode / Cloud connection:

If desired, the settings of the AC ELWA 2 can also be accessed from outside the local network. For this purpose, it is necessary to register the device with serial number and device key in the my-PV data cloud: https://live.my-pv.com/

Open the website and log in or register as a new user. When you register for the first time, you will receive an email with a confirmation link. If the email does not appear in your inbox, it may be in the spam folder.

The serial number and the device key can be found under Cloud connection.

If the cloud mode is also activated, an overview of the recorded operating data is also available after connecting the device to the my-PV data cloud.

Activate the data transfer under Cloud mode.

Privacy: Information on the privacy regulations can be found at www.my-pv.com.

Compatibility mode: There are three options to choose from:

AC ELWA 2 (default)

Imitation AC ELWA-E

In the event that the signal source cannot yet control the AC ELWA 2, an AC ELWA-E is now imitated. The maximum power output is therefore only 3kW.
This may apply to signal sources that specify the power to my-PV via Modbus TCP!

Heating element AC ELWA-E

You use the electronic unit of the AC ELWA 2 on the heating rod of the older AC ELWA-E. The maximum power output is therefore only 3kW. Other immersion heaters are not permitted!

6.1 Download local Web-Interface

Check which IP address the AC ELWA 2 has in the local network. This can be read directly on the display. From the home screen, you can access the status information via the info button (second from the left). Scroll with the arrow to the right to the line "IP". Next to it are four numerical blocks, each separated by a dot. This is the IP address you will need next.

Enter the IP address of the AC ELWA 2 in the address line of the web browser.

Follow the download link (above) and save the file locally, then open the file to access the Web-Interface. Alternatively, you can open the Web-Interface directly in your web browser (link below).

Consider that the appearance and the scope of options can change with updated software versions.

6.2 Connect the local Web-Interface with AC ELWA 2

When opening for the first time, the IP address range of the network in which the unit is located must be set. The entry is saved by the web browser, but the address range can be redefined at any time via settings and the button "IP search range".

If the IP address of the device is known, it can be directly entered by selecting "IP Address Known." The address can be read from the status information on the display.

6.3 Home (homepage)

The home page in the web browser gives the same information as the home screen on the display.

The countdown (10 seconds) next to the home button shows the remaining time until the next data update.

The AC ELWA 2 can be switched off with "Unit status On/Off".

The web interface of other my-PV units in the same network can be accessed directly via a quick selection at the top right.

6.3.1 Widgets

If you are on the home page, the button "Arrange dashboard" is available under settings. This allows the windows on the home page ("Widgets") to be arranged differently. To hide them, drag a widget below the horizontal line and press the "Save" button to save the new arrangement.

6.4 Data logger

The data logger In the web browser gives the same information as the data logger on the display. The selection of values and time period is possible using the menu bar above the diagram.

6.5 Status information

The status information in the web browser contains more details than that on the display.

Explanations can be found in the chapter "Status information on the display".

Depending on the operating mode and application, this representation varies.

6.6 Device Setup

The setting options in the web browser are more extensive than those on the display. See next section " Special setting possibilities in the Web-Interface".

An explanation of the other general unit settings is included in the chapter "General settings".

An explanation of the other specific unit settings for the different operating modes is included in the chapter "Operating modes".

6.7 Special setting one the Web-Interface

The following unit settings are only possible in the web interface and cannot be carried out on the display.

6.7.1 Special settings for operating mode M1 (3.5 kW)

Special Settings for Operating Mode M1 (3.5 kW) The following parameters can be set in operating mode M1 (3.5 kW) via the web interface.

Activate AUX relay during heat output: If this option is "On," the AUX relay will be activated for at least 120 seconds during heat output. The relay can thus be used as a potential-free signal transmitter. It can also be used to switch smaller circulation pumps with power up to approximately 50 watts.

6.7.2 Special settings for operating mode M3 (3,5 + 3 kW)

The following parameters can be set on the web interface in operating mode M3 (3,5 + 3 kW).

Control tolerance: This value defines the reaction sensitivity of the AUX relay to changes in the power input. The second heating rod is switched by the relay.

6.7.3 Time

In the web setup, a time server or NTP server (NTP = Network Time Protocol) can be defined by means of a domain name. Region and location can also be set on the display under "Time zone".

6.7.4 Control Settings

In this section the choice of the signal source for the AC ELWA 2 is made.

The "Interval target value" function causes the AC ELWA 2 to automatically change the target value of the control to another adjustable target value for a certain duration in an adjustable time interval. This can ensure that other applications with regulated surplus control are not deprived of surplus energy by the my-PV application.

This includes, for example, charging stations for electric cars that are neither directly nor indirectly connected to my-PV. Therefore, my-PV sets -1500W as the default for the interval target value. This corresponds to the minimum charging power of many electric cars.

The function „Block“ allows to define a time window within AC ELWA 2 must not run. Unlike the two time frames for hot water securing the transition to the following day is possible (Start Hour is higher than Stop Hour). For example, this function can be used to give an existing battery time for charging and to do the water heating subordinate.

The function blocks the surplus control, as well as the optional boost backup. It also applies to the AUX relay in operating mode M3.

The blocking time does not apply to the optional boost backup setting via SELV relay.

6.7.5 Measurement Settings

As an option, other measurements can be queried in the system in addition to PV excess measurement (see Control Settings) and visualise them on the my-PV cloud. Available variables are Photovoltaic power, Battery power, EV Charging station power and Heat pump power.

Detect measuring point with "my-PV Meter"
If you are using the my-PV Meter to detect these values, you must enter the ID (serial number) of the device. You will find this number on the device.

Detect measuring point by requesting data from external device ("Adjustable Modbus TCP")

If the measured values come from an external device like an inverter or Modbus meter, the required communication registers shall be set according to the manufacturer's description.

Photovoltaic power

At the measuring point "Photovoltaic power" it is possible to block the my-PV device if the inverter does not produce any power. The operation for optional boost-backup is not affected by this.

Battery power

With the "Battery power" measuring point, it is also possible to query the SOC (State of Charge) of the battery and the battery status, if this information is provided by the battery.

EV Charging station power

At the "EV Charging station power" measuring point, it is also possible to query the SOC (State of Charge) of the vehicle, if this information is provided by the charging station.

If the "Interval target value" control function is used (see chapter "Control settings") and the "EV Charging station power" measuring point is also queried, it is possible to define an additional duration of the interval target value here. The interval target value is thus extended by this additional duration, provided the power at the charging station is at least above 500W at the end of the first interval.

The positive effect of this is that the time of the higher target value of the control can be significantly shortened. It is regulated back to the original target value more quickly, which in turn ensures higher self-consumption.

6.7.6 EV Function

This option is not yet available in this firmware version.

6.7.7 Multi units

Multiple AC ELWA-E, AC•THOR or AC•THOR 9s can be used in a network. Operation is based on the master / slave principle.

Settings on Slaves

For the slaves only the device numbers has to be specified (see Basic Settings). All other settings are only required on the master.

As soon as an assignment has been made, further control settings are no longer possible or required. The IP address field is disabled and “Slave” appears in the Signal source field.

After a device search in the quick selection at the top right, the slave with the set number appears. Switching between the devices is possible here.

Settings on Master

Only for devices with number 1 (= master) the following display appears in the setup:

To make the settings for several devices on the master, first choose between Synchron and Stratify. In the case of synchronous charging, the power is evenly distributed to the master and its slaves. In the case of stratified charge, the devices are controlled one after the other according to their numbers, in each case until the set target temperature is reached.

After selection, please start the "Search for slaves" and activate the desired devices. Then save the setting.

6.7.8 API

This menu item only appears in the device settings in the my-PV Cloud, not in the local Web-Interface! For this, it is essential that the device has an active internet connection and “Cloud mode” is activated.

The my-PV API allows current operating data to be queried and setup changes to be made via an internet-based interface (https). Power can be specified for the duration specified in the request.

An access token can be generated in the ‘API’ menu item. In conjunction with the 16-digit serial number of the device, the endpoints of the API can be used with the token. This token is only displayed once in the my-PV Cloud, so please make a note of it. However, you can generate a new token at any time if necessary.

The detailed documentation of the API (Swagger documentation) is available at: api.my-pv.com

With the button "Check for updates", the unit checks whether a newer firmware version is available. If this is the case, the latest version number appears next to the currently installed version number.

The button "Download update" starts the download of the latest firmware (State: Downloading).

The button "Update Firmware" starts the installation.

The my-PV logo on the unit flashes at short intervals during the installation of eXXXXXXX.

When installing, a display shows the installation progress.