EPM 5G-Plus + RHI-3P(3-10)K-HVES-5G Parallel Operation

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EPM 5G-Plus + RHI-3P(3-10)K-HVES-5G

Parallel Operation

Discover the untapped potential of your solar energy system with the parallel operation option offered by Solis RHI Three-Phase Inverters.

In this article, we explore how this feature allows users to maximize energy production effortlessly.

For any additional assistance, Solis Support team is readily available to assist you and to ensure a seamless solar experience.

Let's delve into the world of parallel operation and empower users to harness the full power of the sun with confidence in reliable support.

Note:

Currently, this scenario is not being accurately displayed on SolisCloud.

Our dedicated SolisCloud Support team is actively addressing the issue to ensure that this scenario will be correctly displayed on our SolisCloud Platform.

Index:

Applicable Devices
Requirements
Connection Diagrams
EPM 5G-Plus – Internal Data Logger Disconnection
Devices configuration

Applicable Devices:

Solis-EPM3-5G-Plus
RHI-3P(3-10)K-HVES-5G
Solis Three-Phase PV Inverters

Requirements:

For connecting in parallel Solis Hybrid Inverters RHI-3P(3-10)K-HVES-5G with Solis Three-Phase PV Inverters, some items are compulsory to be added into the system:

1 pc. - Solis-EPM 5G-Plus
2 pcs. - S3-GPRS/WiFi-ST Data Loggers
3 pcs. - CTs dimensioned with the primary according to site capacity and having 5A in the secondary
A stable Internet Connection

https://www.solisinverters.com/global/downloadcenter.html

Schedule a call/meeting with Solis Service, at least 4 days before commissioning, providing them all the information of the system (system components, configuration, missing parts, etc.).

Notes:

1. The firmware version of all devices must be upgraded to the latest tested version.

2. The EPM-Plus HMI firmware version required for this type of configuration is 1E.

3. The PV Inverters need to be upgraded to a special version only if the site requires Export Limitation function.

Connection Diagrams:

Electrical Diagram

ModBus RTU - RS485 Communication between the inverters and EPM

Yellow chain Positive (+)

Blue chain Negative (-)

EPM-Plus – Internal Data Logger Disconnection

To enable the EPM update via the S3-WiFi-ST Data Logger, it is necessary to disable the internal Logger of the device.

There are two ways to do this:

Note:

Before proceeding with this step please check with Support Team which is the model of the EPM-Plus internal Data Logger. If the internal Data Logger is already an S2-WiFi-Logger, the step below can be skipped.

1. Disabling by disconnecting the internal wiring (recommended)

You need to open the EPM enclosure and disconnect the connections, as shown in the image below:

Note: After internal Data Logger disconnection, the external S3-GPRS/WiFi-ST Logger can be twisted on the EPM.

2. Disabling from software

Step 1: Turn ON the EPM device.

Step 2: Turn ON the WiFi on your mobile phone, search for the Logger’s hotspot displayed as AP_xxxxxxxxx and connect to it.

Step 3:

Open a browser on your mobile phone (e.g. Safari, Chrome)
In the search bar of the browser type: 10.10.100.254 and access
Click on “Advanced”--> “Work Mode”
Change the Working mode to “Transparency”
Press “Save”

Wait for about 10 seconds, then the "Restart" option will appear, click "Restart".

Step 4:

During WiFi Restart, the signal will be disconnected from the mobile phone.

Try to refresh the WiFi list until you find again AP_xxxxxxxxx and reconnect.

Doble check in “Working Mode", to be sure that "Transparency" mode is active (VERY IMPORTANT).

DEVICES CONFIGURATION

1. EPM3-5G-Plus

1.1 Transmit ON/OFF

Path: Advanced Settings à Password: 0010 à Transmit ON/OFF

Set to: OFF

1.2. Address

Set the address: 01

Path: Settings à Set Address à 01

Note: If the S3-GPRS/WiFi-ST Data Logger is not properly detected, it is recommended to disconnect the internal wiring as indicated above.

1.3. Inverter Qty Set

Set the maximum number of slave addresses that will be allocated to the inverters.

Path: Advanced setting → Password: 0010 à Inverter Qty. Set à Set INV Num: Max number of slave address among all inverters.

Example: 3 hybrid inverters in parallel with slave address 02, 04, 06. Set Inverter Qty. Set to “06”

1.4. Set Capacity

Set to: Rated Power of all inverters under the EPM.

Path: Advanced settings à Password: 0010 à Set Capacity à Adding up the “Rated Power” of all inverters under the EPM

1.5. Set Meter CT

Set to: CT ratio of the external CTs

Path: Advanced setting à Password: 0010 à Set Meter CT à CT ratio of the external CT

Example: If 100:5A CT are used, set the CT ratio as 20:1

1.6. Backflow Power

Set the allowed backflow power.

Path: Advanced settings à Password: 0010 à Backflow Power à Set Power à Allowed backflow power.

1.7. Backflow Work Mode

Set to: 01

Path: Advanced settings à Password: 0010 à Backflow Work Mode à01

1.8. Inverter type

If there is at least one Hybrid Inverter, select “Hybrid Inverter”.

If all connected inverters are grid tied inverters, choose “PV inverter”

Path: Advanced settings à Password: 0010 à Inverter Type à Hybrid Inverter

1.9. FailSafe ON/OFF

Set to: Run

Path: Advanced settings à Password: 0010 à FailSafe ON/OFF à FailSafe: RUN

1.10. Set the PT ratio

Set the PT ratio for the EPM PT: 1:1

Path: Advanced Settings à Password: 0010 à Set Meter PT à Set PT Para: 0001:1

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2. Solis Three-Phase PV Inverters

2.1 Set Address

Set to: Odd Number (01, 03, 05, etc.). Set a different address on each inverter.

Path: Settings à Set Address à Odd number

2.2 Internal EPM Set

Set to: OFF

Path: Advanced Settings à Password: 0010 à Internal EPM Set à Mode Select: OFF

2.3 External EPM Set

Set to: ON

Path: Advanced settings à Password: 0010 à External EPM set à 5G-EPM à Fail Safe Set: ON

Note:

In case the Export Limitation is a requirement of the site, for the EPM to be able to control and limit the string inverters as well, it is necessary to upgrade the HMI to a specific firmware released for that model.

This operation can be performed by the Service Team remotely, once the inverters have been connected to the WiFi using the second Data Logger and before connecting it to EPM.

If it is not necessary to control the export, the special firmware upgrade for PV inverters is not required.

3.Hybrid inverters

3.1 Set Address

Set to: Even Number (02, 04, 06, etc.). Set a different address on each inverter.

Path: Settings à Set address à Even number