I'm setting up an off-grid solar solution and the MPPT controller I purchased only supports modbus via serial. Had I spent an extra $200, I could have got the next model up to have a RJ-45 port, web interface and SNMP features but maybe down the road I will upgrade. It all started with a co-worker recommending Cacti and I have now decided to expand that to include a separate full display console as well and have everything run off solar power.
- Raspberry Pi 2 Model B - This is my Cacti Server connected to the MPPT controller
- Raspberry Pi 3 Model B - This is my display board console for graph display mounted next to my Inverter Panel.
- Element 14: 4DPi-24-HAT - Raspberry Pi 2.4in QVGA Touchscreen LCD Hat Module
- DROK DC-DC Volt Buck Converter 8-50V 12V24V36V to 5V 3A (currently on order)
- Serial to USB cable
- TriStar MPPT TS-45 solar controller
- Raspbian Jessie with PIXEL
- Cacti 0.8.8b
- Cacti Plug-in Cycle-v2.3-1
- Libraries & software for modbus
Cacti was chosen to allow long term solar & charging stats to be saved into a database and viewed by built in graphs available.
My Cacti Pi Server is setup on Pi 2 (for low power requirements) and currently graphing default stats (CPU, RAM, etc.) for now.
My "Pi Display console" will be a dedicated display to cycle through the graphs with data received from my MPPT controller
Edits to Cycle plug-in PHP files are required to fit the graph nicely on 2.4 inch LCD
I added entry into ~/.config/lxsession/LXDE-pi/autostart to have chromium load full screen in kiosk mode
I also picked up a 7800 mAh battery pack to allow my Pi 3 with 2.4 LCD touch screen to be fully mobile, leveraging the wireless functionality.
Next stage: Currently working on getting the MPPT controller setup. Then installation of Libmodbus on Raspberry pi.
Project by: Ryan