The newly designed Spartan Power SP-TS4500PLUS transfer switch builds on the immense popularity of the original SP-TS4500 transfer switch by adding features it's customer asked for! The new solar & wind dual power transfer switch allows the user to define exactly what voltages he or she requires for the Cut-off and Recovery points. Also, the new SP-TS4500PLUS can be used with 12V, 24V or 48V DC input, no more purchasing separate models. This model can also be used all over the world as it can accept 110-120Vac 60Hz or 220Vac 50Hz! 5500 watts at 110VAC, 50A transfer switch. WORKS LIKE A UPS, BUT IN THE OPPOSITE DIRECTION! The SP-TS4500PLUS will switch to the grid when your batteries reach a user defined voltage, once the batteries reach the user defined Recovery Point Voltage, power will transfer back to battery power. Great for solar or wind systems on those cloudy or windless days and your batteries get low. Take charge over your battery bank! U.S.A. based tech support! BRIGHT LCD DISPLAY INTERFACE ALLOWS THE USER TO SET AND SEE CONTROL FUNCTIONS! LCD interface: 1. LV-SW - Set Low Voltage Cut-Off 2. BAT-V - normal displaying battery voltage 3. HV-SW - Set High Voltage Recovery Point 4. 12V, 24V, or 48V Right arrow shows low voltage triggered switch to AC mains. Left arrow shows that power is restored to the inverter. LCD turns red when no function control display, fixed display after power on. The battery icon shows low voltage status. SPARTAN POWER SP-TS4500PLUS DUAL POWER TRANSFER SWITCH CONTROLLER SPECIFICATIONS Model: SP-TS4500PLUS Transfer Switch: 50A Maximum Rated Power: 5500 Watts Input Voltage: 110-120Vac 60Hz or 220Vac 50Hz Output Voltage: 110-120Vac 60Hz or 220Vac 50Hz Transfer Time: ≤ 10ms LED Indicator: Working Status of Public Power, Inverter and Battery. System Voltage: 12V or 24V or 48V Product Size: 8" X 7" X 2.9" in Weight: 3 lbs