EA800, Online Low Frequency UPS(1kVA-20kVA) Features: 1) Intelligent battery charging management 2) True RS232 interface port 3) Overload and short-circuit protection 4) Pure sine wave output 5) Wide input voltage window 6) Friendly LCD front panel display 7) High compatibility with generators 8) Parallel-redundant system available 9) Galvanic isolation transformer at the inverter output 10) Efficiency up to 91% 11) Static by-pass and service manual available 12) True Online Dual conversion design