The YANAN SLI Brush Alternator has two type. First type of the brush alternator is the Single Phase, wherein it can run from 50Hz-3000r.p.m and 60Hz-3600r.p.m. The second type of the brush alternator is the Three Phase wherein it runs from 50Hz-3000r.p.m and 60Hz-3600r.p.m. Its operating time depends upon the model.