Solar Changeover Panel -
pre-assembly.
THE SOLUTION:
We designed a simple solar plc logic program to primarily control and automate the priority monitoring of solar battery voltages and solar control measures for switching/cycling of solar mains and batteries to the second system providing low battery conditions were exhibited for a prolonged period of time.
An analog trigger output from the dedicated solar battery voltage switches is used to initiate the load cycling which can step forwards/backwards in a priority sequence based on time periods or loads demands from feedbacks in the field using the priority logic based on feedback from the loads (via the voltage switches).
Solar Automation
CLIENT: Mi-Spec.com
PROJECT: The Barrier Islands - NZ
Off Grid Solar Automation
CHALLENGE:
We were asked to design, build and program a simple PLC controller panel to switch solar generation loads between two 5KW off grid solar systems. If one solar systems batteries are low (12VDC system) then the solar mains changeover contactors would isolate this system and switch to the second system (48VDC system) or vice versa. In addition automatic generator charging of the low solar battery system was required to ensure minimum charging time to reinstate the solar system. If both solar systems were low then automatic generator charging of the solar battery systems along with mains generator power were required to both systems.​
Solar PLC Controller for remote gates and lights automation.
THE TECHNOLOGY:
Schneider Modicon PLC Controller
Schneider Zelio SR3B261BD PLC modules with Schneider SR3MBU01BD RTU Modbus Communication
Schneider HMISTU-855 HMI Harmony Panel
IFM Pressure Voltage Switches for the automation of the solar change over triggering.
HMISTU855 HMI Panel
From left to right - solar convection roof controller panel,
pump panel and solar gate and lighting automation panel.