... + 1, parallel and redundant•High efficiency > 92% •Dual Input (optional)•100% unbalanced load allowed•Cold start function• ... mswave formSine WaveVoltage T.H.D.<2% with linear load, <5% with nonlinear loadCrest factor / power factor3:1 / 0.9TechnologyTrue ... battery exhausted, low output voltage, high output voltage, DC fuse open, %v power supply fail, 13.5 v power supply fail, inverter overvoltage, ...