Checking the Wiring
Qualified person
Ensure that you carry out all tests relevant to the system and rectify all detected problems. Tip: Tests can be documented directly in the tables. Cross out all tests not applicable.
Requirement:
All Sunny Island inverters must be disconnected from all voltage sources ( > Disconnecting the Inverter from Voltage Sources).
Checking the Grounding
Test point | Test criterion | Ok |
|---|---|---|
Enclosure opening ExtVtg | Enclosure opening is sealed with a filler plug or M20 cable gland. | |
The cable diameter of the cable must be 7 mm to 14 mm for an M20 cable gland. | ||
Cable length at the ExtVtg connection | The cable length must be less than 30 m. | |
Conductor cross-section of the grounding conductor at the AC1 and AC2 connections | If 1 grounding conductor is connected, the conductor cross-section must be at least 10 mm². If 2 grounding conductors are connected, the cross-section of each conductor must be at least 4 mm². | |
The grounding conductor must be threaded through a ferrite. | ||
Grounding conductor connection to ground | The grounding conductor must be grounded, e.g., by connection to a grounding busbar or a foundation ground electrode. | |
With a TN system, neutral conductor and grounding conductor connection | Ensure by measuring that there is a conductive connection between the neutral conductor and the grounding conductor. | |
Grounding of the battery | Ensure that the battery is not grounded unintentionally. If the battery has been grounded intentionally, ensure that the conductor cross-section is sufficient ( > Connecting the Grounding Conductor with a Grounded Battery). |
Checking the Additional Grounding
If the battery is grounded, you must check the additional grounding on the Sunny Island.
Test point | Test criterion | Ok |
|---|---|---|
Conductor cross-section for the additional grounding | The conductor cross-section must correspond to the grounding of the battery. | |
Connection of additional grounding | Hexagon socket screw is screwed tight (torque: 4 Nm to 5.7 Nm). | |
Grounding conductor connection to ground | The grounding conductors must be grounded, e.g., by connection to a grounding busbar or foundation ground electrode. |
Connecting the Sunny Island Inverter
Test point | Test criterion | Ok |
|---|---|---|
Enclosure opening for DC | In the cable gland M32, the diameter of the DC power cable must be 14 mm to 25 mm. | |
DC connection | Terminal lugs are pressed on firmly. | |
The bolted connection for fitting terminal lugs to the DC connection is assembled as follows: head of M8x20 screw | conical spring washer | fender washer | terminal lug | DC connection. | ||
Terminal lugs are firmly fastened on the Sunny Island (torque: 12 Nm). | ||
DC power cable | The maximum length of the cables from the battery via the battery fuse to the Sunny Island is 10 m. | |
The conductor cross-section meets the cable requirements of 50 mm² to 95 mm² (for the recommended conductor cross-section, see Section 7.4.1). | ||
Battery fuse | Fuse links are matched to the Sunny Island.
| |
The cable glands connected to the battery fuse are tightened with the specified torque (see manufacturer documentation). | ||
If installed, battery current sensor | The battery current sensor can be loaded with the maximum DC current (see technical data of the battery current sensor). |
Checking Connections AC1 and AC2 of the Sunny Island Inverter
Test point | Test criterion | Ok |
|---|---|---|
Enclosure openings AC1 and AC2 | All enclosure openings are sealed with M25 cable glands or filler plugs. | |
For an M25 cable gland, the cable diameter must be 9 mm to 18 mm. | ||
AC1 and AC2 terminals | All contact areas are not insulated. | |
All terminal levers are in the downward position. | ||
All cables are securely clamped. | ||
AC power cable at connection AC1 | The cables are sufficiently protected by circuit breakers. | |
Trip-capable circuit breakers are installed and additional type A residual-current devices have been installed. Maximum trip-capable circuit breakers:
| ||
With a three-phase system, allocation of the Sunny Island inverters | The allocation of the Sunny Island inverters to the line conductors of the stand-alone grid or the Multicluster-Box results in a right-hand rotating magnetic field. The master must be assigned to L1, slave 1 must be assigned to L2, slave 2 must be assigned to L3. |
Checking the Generator Connection
Test point | Test criterion | Ok |
|---|---|---|
The connection cables | The conductor cross-section is sufficient for the maximum generator current. | |
The cables are sufficiently protected by circuit breakers. | ||
With a three-phase off-grid system, allocation of the line conductors | The allocation of the Sunny Island inverters to the line conductors of the generator results in a right-hand rotating magnetic field. The master must be assigned to L1, slave 1 must be assigned to L2, slave 2 must be assigned to L3. | |
Grounding | The exposed conductive part of the generator is grounded. |
Checking the Control and Measuring Cables
Test point | Test criterion | Ok |
|---|---|---|
Battery temperature sensor if installed | The battery temperature sensor is connected to the terminal BatTmp. | |
The battery temperature sensor is secured in the middle of the battery-storage system, in the upper third of the battery cell. | ||
If installed, the control and measuring cables of the Multicluster-Box | The control and measuring cables are correctly connected (see Multicluster-Box manual). | |
If installed, the measuring cable of the battery current sensor | The measuring cable of the battery current sensor is connected to the terminal BatCur with the correct polarity ( > Connecting the Battery Current Sensor in the Off-Grid System). | |
Control cable of the load shedding, if installed | The multifunction relay and the load-shedding contactors are correctly wired to each other ( > Connecting Load-Shedding Contactors). | |
Cables at BatTemp and BatCur | The insulated conductors must be threaded through a ferrite. | |
The cable length for BatCur must be less than 3 m. | ||
The cable length for BatTmp must be less than 30 m. | ||
If cable lengths of 30 m and more are required for BatTemp, suitable lightning protection precautions must be taken. | ||
If the battery temperature sensor and the batteries are not installed with the inverter in the same building, suitable lightning protection precautions must also be taken. | ||
Cable at BatVtgOut and DigIn | The cable must be threaded through a ferrite. | |
The cable length must be less than 30 m. | ||
If cable lengths of 30 m and more are required for BatVtgOut and DigIn, suitable lightning protection precautions must be taken. | ||
If cables are to be laid outside for BatVtgOut and DigIn, suitable lightning protection precautions must be taken. |
Checking the Wiring of the Communication Products
Test point | Test criterion | Ok |
|---|---|---|
Electricity supply to communication products | The plug-in power supply units are plugged in. | |
The communication products are connected to an electricity supply. | ||
Termination of the communication buses | The communication buses are connected to the first and last device in the bus. | |
Multicluster-Box control and measuring cable (BackupVtgCur) | The cable length must be less than 30 m. |
Checking the System Devices
Test point | Test criterion | Ok |
|---|---|---|
System components | All system devices are correctly connected (see the manuals for the devices). | |
Ensure by measuring that all system devices are connected with the same ground potential. | ||
AC1 connection | After the system-specific connection, the required components are connected at terminal AC1 (see Installation - Quick Reference Guide of the System Used). | |
AC2 connection | After the system-specific connection, the required components are connected at terminal AC2 (see Installation - Quick Reference Guide of the System Used). |