How to Combine Two AC Inputs for Load Sharing up to 2KW With Priority Switching?

✨ The discussion addresses the challenge of combining two AC power inputs to share load up to 2 kW with priority switching, where AC1 supplies up to 1 kW and AC2 supplements any additional load. Key technical issues include the difficulty of paralleling unsynchronized AC sources without phase alignment, making direct AC load sharing complex. A common solution involves rectifying both AC inputs to DC, then inverting back to AC for load supply, though this typically results in equal load sharing rather than prioritized distribution. The context involves on-grid solar systems aiming to maximize solar energy utilization without feeding excess power back to the grid, which is problematic in some regions due to grid overload. Standard grid-tie inverters synchronize solar DC output with the grid and feed excess power back, but they disconnect during grid outages and do not prevent export to the grid. Alternative approaches discussed include using microcontrollers or PLCs to control contactors for priority switching and load sharing, and employing devices like the I-Boost, which diverts excess solar power to local loads (e.g., hot water tanks) to avoid grid export. Battery storage systems combined with inverters can provide backup power and load management but add complexity. The overall solution requires precise synchronization, power sensing, and control logic to prioritize solar power usage, supplement with grid power as needed, and prevent backfeeding to the grid.