Plant Controller and Monitoring solution

Plant Controller and Monitoring Solution









The Delta Plant controller and monitoring solution can provide online monitoring export limitation using the RPI M-Series inverters to comply with the AS4777.1 2016 soft limit requirements for commercial PV installations >30kVA.

For end users, remote monitoring can be provided for both site consumption and the production, DC/AC voltages and currents at the connection point and for each individual inverter.

For installers, remote access can be provided to the inverters local interface for diagnostic purposes or change settings to improve the performance of the system or avoid nuisance tripping of inverters and protection equipment.

New features can be developed locally in the Delta Melbourne office by our in house engineering team for building management system integrations, SCADA functions for DNSP approval for specific projects, please inquire within for further details.

If using our consulting service, Delta By Design for your >30kVA grid connection application. In conjunction with our partners at CTP, we can provide switchboard incorporating secondary protection relay to suit the requirements of AS4777.1 2016  which is pre-wired with the plant controller and monitoring solution, simply install the switchboard and connect the inverters. see below the case study for 90 kVA system at Tradezone Arundel Qld.



System Overview - Functional Diagram

The diagram below shows how each component in the system works together  to provide online monitoring and remote access to end users and technical people.



Basic wiring - Example of Switchboard wiring diagram

The diagram below shows the DC1-100 connected to the P1E power meter via RS485. The meter is measuring power flowing through the incoming mains and providing this data to the DC1 which is power limiting the inverter in order to limit the amount of power exported to the grid. Please refer to the commissioning tab above to see how the installer would configure the DC1-100 and inverter using the app and make production and consumption data available to the customer online.

This drawing can be downloaded as a pdf from here - 401 -A2 - DC1-100 Data Management System

Table of features and components

Not all components in the solution are required for some features. This can be useful to save cost. For example, if export limiting is needed, but online monitoring and remote access are not required, then only a PLC and Meter is needed. The table below explains which components are required for a given feature.







Online Monitoring

Remote access to detailed inverter data and configuration parameters, this can be accessed by installers and Delta technical staff only.

Data can be accessed for Online monitiring for production, consumption data and inverter parameters via the argos portal , this can be accessed by end users and installers.

The phisical installation would be wired as shown in the Example "SLD for export limiting a single H5A" available in the "physical installation" tab above.



Remote Access




Application 1 - Example SLD for export limiting a single H5A

The installation below is an example of a RPI H5A with ~6.6kW of panels connected on a single phase property where export limiting is required. Please refer to the commissioning tab above to see how the installer would configure the DC1-100 and inverter using the app and make production and consumption data available to the customer online.

This drawing can be downloaded as a pdf from here -Download PDF - 400 -A2- 1xH5A Flex & 6.5kWp REC 295Wp


Application 2 - 2 x H5A inverters on a 2 phase installation with export limiting and phase interlocking

In many situations, it is required that no more than 5 kVA of unbalanced (or single phase) generation can be connected to the grid, otherwise current imbalance protection may be required. It is also required that if multiple single phase inverters are connected across different phases, if one inverter has a fault that causes it to stop working, the other inverter must also shut down. The diagram below shows how both of these requirements can be achieved on a 2 phase installation. A 5 kVA H5A is connected on each phase, a P3E meter with DC1 is installed at the connection point. see the comissioning tab above for a video on how the installer would use the MyDeltaSolar App and commission the system such that no more than 5kVA to be exported to the grid and enable the interlocking feature.

This drawing can be downloaded from WINAICO-2xH5A-A1-400 (2)

REmote access can help to get to the root cause of any abnormal conditions in the system more quickly than regular online monitoring and also allows those with administrative access to adjust configuration settings of the inverter, so that nuisance tripping can be stopped due to grid overvoltage errors, without costly site visits.

MyDeltaSolar App

  • The MyDeltaSolar app is constantly being updated and you should ensure that you upgrade to the latest version prior arriving on site.


  • Flex HX/HXA - The minimum firmware versions for current features are listed in the table below

Power Meter

  • P1E- The 7-9th digit of the serial number must be at least 172 (i.e. 172, 173,174,175 and above would be acceptable) example serial number - PPM P1E-000O2S1720000W0

Compatibility Table


Export limiting and Features


The Power meter communicates with the PLC and inverters via hardwired RS485. Export limiting can be configured to comply with the soft limit requirements of AS/NZS 4777.1:2016, where inverters are power limited such that the amount of power being exported to the grid is limited to a value which is set by the user. At Delta Australia we can pre-comission the system prior to providing equipment to suit your project requirements.

[/tab] [/tabs]