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Felicitysolar IVEM Series (5KVA) Solar Inverter Parallel Connection Manual

Brand: Felicitysolar

Model: IVEM Series (5KVA) / 358-010045-02

Product Type: Solar Inverter

Introduction

This manual provides instructions for the parallel connection of Felicitysolar IVEM Series (5KVA) solar inverters. The inverters can operate in two modes: parallel operation in a single-phase grid or supporting three-phase equipment.

Parallel Operation Capabilities:

Note: If this unit is supplied with a shared current cable and a parallel cable, the inverter defaults to supporting parallel operation. You may skip Section 2.

Package Contents

The package typically includes:

Mounting Instructions

When installing multiple devices, ensure adequate spacing for ventilation and heat dissipation:

Ensure each unit is installed on the same level.

Wiring Instructions

Single-Phase Parallel Connection

For single-phase parallel connections, inverters are connected in parallel for power (all Live (L) outputs joined, all Neutral (N) outputs joined) and daisy-chained for communication.

WARNING: Before starting the inverters, please connect all AC output N wires together.

2 Inverters

Power: All 2 inverter L outputs connected together; all 2 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2).

3 Inverters

Power: All 3 inverter L outputs connected together; all 3 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), Inverter 2 (port 1) → Inverter 3 (port 2).

4 Inverters

Power: All 4 inverter L outputs connected together; all 4 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), Inverter 2 (port 1) → Inverter 3 (port 2), Inverter 3 (port 1) → Inverter 4 (port 2).

5 Inverters

Power: All 5 inverter L outputs connected together; all 5 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 4 (port 1) → Inverter 5 (port 2).

6 Inverters

Power: All 6 inverter L outputs connected together; all 6 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 5 (port 1) → Inverter 6 (port 2).

7 Inverters

Power: All 7 inverter L outputs connected together; all 7 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 6 (port 1) → Inverter 7 (port 2).

8 Inverters

Power: All 8 inverter L outputs connected together; all 8 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 7 (port 1) → Inverter 8 (port 2).

9 Inverters

Power: All 9 inverter L outputs connected together; all 9 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 8 (port 1) → Inverter 9 (port 2).

10 Inverters

Power: All 10 inverter L outputs connected together; all 10 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 9 (port 1) → Inverter 10 (port 2).

11 Inverters

Power: All 11 inverter L outputs connected together; all 11 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 10 (port 1) → Inverter 11 (port 2).

12 Inverters

Power: All 12 inverter L outputs connected together; all 12 inverter N outputs connected together.

Communication: Inverter 1 (port 1) → Inverter 2 (port 2), ..., Inverter 11 (port 1) → Inverter 12 (port 2).

Three-Phase Parallel Connection

For three-phase parallel connections, inverters are assigned to specific phases (P1 for L1, P2 for L2, P3 for L3). Power connections are made to the respective phase L and N lines, and to the load L and N lines. Communication cables connect inverters as shown in diagrams.

WARNING:

  1. Before starting the inverters, please connect all AC output N wires together.
  2. Do not connect the current sharing cable between inverters located in different phases. This may cause damage to the inverters.

1 Inverter Per Phase (P1 for L1, P2 for L2, P3 for L3)

Configuration: One inverter assigned to each phase (P1 to L1, P2 to L2, P3 to L3).

Power Connection: Grid L1, L2, L3, N; Load L1, L2, L3, N. Inverter P1 connects to L1 and load L1; P2 to L2/load L2; P3 to L3/load L3.

Communication Connection: Inverters are daisy-chained: P1 (port 1) → P2 (port 2), P2 (port 1) → P3 (port 2).

Note: Optionally, 4 inverters can be selected per phase. P1: L1-phase, P2: L2-phase, P3: L3-phase.

2 Inverters Per Phase

Configuration: Two inverters assigned to each phase (P1a, P1b for L1; P2a, P2b for L2; P3a, P3b for L3).

Power Connection: Grid L1, L2, L3, N; Load L1, L2, L3, N. Inverters for each phase are connected in parallel to their respective phase L and N lines and load lines.

Communication Connection: Inverters within each phase are daisy-chained (e.g., P1a port 1 → P1b port 2). Inter-phase communication connections are also shown.

3 Inverters Per Phase

Configuration: Three inverters assigned to each phase.

Power Connection: Grid L1, L2, L3, N; Load L1, L2, L3, N. Inverters for each phase are connected in parallel to their respective phase L and N lines and load lines.

Communication Connection: Inverters within each phase are daisy-chained. Inter-phase communication connections are also shown.

4 Inverters Per Phase

Configuration: Four inverters assigned to each phase.

Power Connection: Grid L1, L2, L3, N; Load L1, L2, L3, N. Inverters for each phase are connected in parallel to their respective phase L and N lines and load lines.

Communication Connection: Inverters within each phase are daisy-chained. Inter-phase communication connections are also shown.

Various Three-Phase Configurations (Examples)

The manual illustrates numerous other three-phase configurations, involving combinations of inverters across phases, such as:

In all these configurations, inverters assigned to the same phase are connected in parallel for power to that phase's L and N lines, and daisy-chained for communication. Connections between phases are also depicted as per the diagrams.

Connection to Photovoltaic System

Please refer to the separate inverter user manual for connecting photovoltaic modules. Each inverter must be connected to photovoltaic modules independently.

LCD Display Settings

The LCD display is used for configuration. Key settings include:

Output Mode Settings

ProgramDescriptionSelection OptionsNotes
28Output ModeSingle-phase (PAL)For parallel operation in a single-phase system, select "PAL" in Program 28.
Parallel (PAL)
L1 Phase (3P1)For three-phase support, at least 3 inverters are required, up to a maximum of twelve. At least one inverter per phase is needed, or up to ten inverters in a single phase. Select "3P1" for inverters connected to L1, "3P2" for L2, and "3P3" for L3. Do not connect the current sharing cable between inverters on different phases.
L2 Phase (3P2)
L3 Phase (3P3)

Commissioning

Single-Phase Parallel Operation

  1. Pre-commissioning Checks:
  2. Initial Setup: Turn on each unit and set Program 28 to "PAL" on each inverter's LCD display. Then, turn off all units.
  3. Note: For safety, it is recommended to turn off the breaker during LCD program settings.
  4. Power On: Turn on each unit. If configured correctly, one inverter will display "HS" (Master) and the others "SL" (Slave) on the LCD. Otherwise, recheck steps 1 and 2.
  5. AC Grid Connection: Turn on all AC line switches on the input side. The system will operate normally if the AC grid is detected and matches the configuration.
  6. System Ready: If no error signals appear, the parallel system is fully set up.
  7. Load Connection: Turn on all AC line switches on the load side. The system will begin supplying power to the load.

Three-Phase Support Operation

  1. Pre-commissioning Checks:
  2. Initial Setup: Turn on all units and sequentially set Program 28 on the LCD display for each inverter as P1, P2, and P3 accordingly. Then, turn off all units.
  3. Note: For safety, it is recommended to turn off the breaker during LCD program settings.
  4. Power On: Sequentially turn on all units.
  5. AC Grid Connection: Turn on all AC line switches on the input side. If the AC grid is detected and matches the phase configuration, the units will operate normally.
  6. System Ready: If no error signals appear, the three-phase support system is fully ready.
  7. Load Connection: Turn on all AC line switches on the load side. The system will begin supplying power to the load.

Error Code Table

When an error occurs, the inverter shuts down power, and the error LED indicator lights up continuously. The LCD displays an error icon ❗ and the error code.

Error CodeFault DescriptionTroubleshooting
40Parallel CAN communication failure1. Check CAN communication cable connections and restart the inverter.
2. If the problem persists, contact the installer.
41Parallel synchronization signal failure1. Restart the inverter.
42Parallel node loss2. Check if L/N cables are reversed on any inverter.
3. For single-phase parallel systems, ensure shared cables are connected to all inverters. For three-phase support, ensure shared cables are connected to inverters within the same phase and disconnected from inverters in different phases.
4. If the problem persists, contact the installer.
43Reverse current feedback detected in inverter.1. Update firmware on all inverters to the same version.
2. Check each inverter's firmware version via LCD settings to ensure processor versions are identical. If not, contact the installer for firmware updates.
3. If the problem persists after updating, contact the installer.
44Firmware version of each inverter is not the same.1. Check shared access cables are well-connected and restart the inverter.
2. If the problem persists, contact the installer.
45Output current of each inverter differs.1. Turn off the inverter and check Program 28 settings on the LCD.
2. For single-phase parallel systems, ensure Program 28 is not set to 3P1, 3P2, or 3P3. For three-phase support, ensure Program 28 is not set to "PAL".
3. If the problem persists, contact the installer.
46AC output mode setting differs.

Note: For safety, it is recommended to turn off the breaker during LCD program settings.

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