Commissioning the Battery Current Sensor in Off-Grid Systems
Qualified person
To operate the battery current sensor, you must set the type of the battery current sensor and start the adjustments of the battery current sensor.
The Sunny Island distinguishes between battery current sensors of the types 50 mV and 60 mV. The types reflect the amplification factor of the battery current sensor. The amplification factors are given in amperes per 50 mV or in amperes per 60 mV, e.g., 400 A/60 mV.
The basic procedure for changing operating parameters is explained in another section ( > Changing Operating Parameters).
Procedure:
- Switch off the Sunny Island and open the battery fuse load-break switch quickly.
- Short-circuit the measuring cable at the battery current sensor. To do so, Connect the BatCur– and BatCur+ insulated measuring conductors to the connection for BatCur+.
- Close the battery fuse load-break switch quickly and switch on the Sunny Island.
- Set the parameter Current sensor type (60mV, 50mV) to the type and amplification factor of the battery current sensor used.
- Select the parameter Autocalibration of the external battery current sensor and set to On.
- The Sunny Island starts the adjustment.
- After 10 seconds, select the parameter Battery > Battery > Current > Battery current and read off the value.
- If the value of the parameter is not between 0 A and 1 A, perform the following steps:
Check whether the measuring conductors are correctly connected and whether the battery current sensor is short-circuited.
Repeat steps 4 to 6.
- If the value of the parameter is between 0 A and 1 A, switch off the Sunny Island and open the battery fuse load-break switch quickly.
- Connect the BatCur+ insulated measuring conductor on the side for connecting the battery fuse.
- Connect the BatCur– insulated measuring conductor on the side for connecting the battery.
- Close the battery fuse load-break switch quickly and switch on the inverter.
