We are offering ups. this model conforms to the quality standards demanded by the industry. It is reliable and capable of delivering high performance. It is very efficient and utilizes latest technology for flawless operation. specifications battery dg 650/900 1 batt, systemdg 1600 2 batt, system waveform tpziwave input ac range: 110 v – 310 v input dc range: dg 650/900 10.5 – 14.2dg 1600 21 – 28.4 efficiency (on battery mode) dg 650/900 >84%dg1600 >84% protections overload 110% short - circuit 300% charge current dg650 9-10adg 900 9-10a*dg1600 10a*