This circuit is an Automatic Transfer Switch ATS / Changeover with 3 Input Sources (3 ways).
It has 3 seconds time delay to transfer between Grid and Solar system (No delay time for Generator).
Maximum current up to 20 Amps.
Works with both 110V and 220V systems.
Parts list:
IC LM358
IC Socket 8dip
Power supply HI-LINK 12V 3W 250mA
Resistor 51K (2pcs)
Resistor 3K (2pcs)
Resistor 1K (2pcs)
Resistor 10K (4pcs)
Resistor 560
Resistor 3.9K
Capacitor 100uF 16V
Optocoupler PC817
RED LED
BLUE LED
Screw Terminal
Relay 12V 20A (4pcs)
Bridge diode DB107 (2pcs)
Diode 1N4007 (3pcs)
Transistor 2N2222 (2pcs)
Circuit:
You can order this PCB from PCBWay.com:
Video:
