High power alternator for bus air condition system, refrigeration system, fire truck, hydraulic motor... Product no. Avi 2401 series 28v/250a 28v/300a 28v/350a 28v/400a Cw, 2 groove pulley 1. High output with low speed and low noise; 2. Higher charge rate at idle for longer battery life; 3. Built-in double fan to withstand higher operating temperatures; 4. Energy consumption rate of 75%, higher 5%~10% than others. Neutral package or as customers' requests.