The system: ETP48150 system is communication with the power supply system, 48V/50A rectifier products to provide a stable and reliable DC power supply, the power system contains a total capacity of up to three rectifier modules 150A. This series of products designed by IEEE, NEMA, ANSI, and Bellcore standards. Second, the system features: 1. System with N +1 standby capacity; 2. Wide input voltage range (90 to 300Vac, 90 ~ 175Vac linear drop power use); 3 modules wide operating temperature range (-5 ° C ~~ +75 ℃, 45 ℃ ~ 75 ℃ the linear lowering power use); 4. modular precision-engineered, easy expansion; 5 with hot-swap capability, can not affect the operation, to replace the module; 6 light weight , the rectifier modules weighs only 2.0kg; 7 high power density; 8 high power factor (PF> 0.99); 9. highly efficient module (rated output to 54Vdc, efficiency ≥ 91%); 10 VRLA battery float charging pressure temperature compensation; 11 advanced load current technology, are excellent flow characteristics; 12. to achieve intelligent three remote function via RS-232 communication port; 13. installation of low voltage isolation switch to protect the battery from over discharge; 14 high density AC and DC power distribution unit; 15. system has excellent low input voltage start function; 16. intelligent the oil machine management function (optional);