Product: Transfer Switch for PV Inverter Systems Size: 125A Overview Dual power transfer switch designed for photovoltaic systems where the PV inverter and PV array serve as the primary power source and the utility grid serves as backup. The switch provides fast, seamless transfers with minimal disturbance to connected loads. Key benefits Ensures photovoltaic power remains the primary source while enabling reliable utility backup when needed. Fast transfer performance with switch time less than 8 ms and no interrupt to connected equipment. Improves overall conversion performance of the PV system by managing source selection between inverter PV and grid. Clear compatibility limits reduce installation errors by supporting only PV inverter to grid transfers. Primary functions and attributes Function: Automatic dual power transfer between PV inverter PV main and city utility backup. Size: 125A rated unit suitable for many residential and small commercial PV installations. Performance: PC level switching, transfer time less than 8 ms, no interruption during transfer. Compatibility: Intended only for PV inverter and PV system to city utility transitions. Not suitable for transfers between city utility and generator or generator to city utility. Operational note: For this PV inverter type, the B side must be powered on when the system is in use, because inverter output voltage may be unstable. Connect the inverter to the A side so that the inverter and PV system act as the main power source, and connect stable grid power to the B side as backup. Installation and use guidance Connect inverter and PV array to the A side to designate PV as the primary supply. Connect stable grid or city power to the B side to provide automatic backup. Ensure the B side is energized when operating this PV inverter type to prevent instability from the inverter output. Do not use this transfer switch to switch between city utility and a generator. Practical applications Residential rooftop PV system where solar generation is preferred and utility power is backup during low solar periods. Small commercial PV installations seeking seamless switchover to utility power during inverter disturbances or maintenance. Test setups or installations that require rapid, interruption switching between PV inverter supply and city utility, while explicitly excluding generator switching. Why choose this product Designed specifically to manage PV inverter primary operation with utility backup. Fast, reliable switching preserves continuity of service for sensitive loads. Clear compatibility and operational requirements reduce risk of incorrect use or improper source switching.