Sun logger

Raspberry Pi Logger for SUN2000 Huawei string PV inverter

Setup

1. Install Raspbian Buster Lite into SD card.
2. Enable SSH by placing a file named ssh onto the boot partition of the SD card.
3. Setup WiFi by creating a file on SD card - wpa_supplicant.conf with contents:

country=US # Your 2-digit country code
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
network={
    ssid="YOUR_NETWORK_NAME"
    psk="YOUR_PASSWORD"
    key_mgmt=WPA-PSK
}

More info

4. Start Raspberry Pi and ssh into it;
5. Install python dependencies: sudo apt-get install python-pip python3-numpy
6. Restart: sudo reboot;

Note on UART

I suggest using usb converter instead, but if you really need these steps should help:

1. Disable bluetooth by adding a line in file /boot/config.txt: dtoverlay=pi3-disable-bt;
2. Ensure line enable_uart=1 (and core_freq=250?) is in file /boot/config.txt;
3. Ensure console=serial0,115200 is not present in file /boot/cmdline.txt;
4. Release GPIOs 14 and 15 by running sudo systemctl disable hciuart;
5. Refactor code to toggle DERE pin

More info on UART

References

1. Modbus interface defintions V3.0
2. Signal cable pinout