Tumo-Int 400 Watts 5Blades Wind Turbine Generator Kit with Controller (12/24V) 400W rated , 550W maximum power, 5 blade wind turbine kit. Breeze start up, free maintenance. Electromagnetic control over speed control. Little vibration, no noise. 1 year warranty. MPPT controller available. Low wind start up. Model: 400W 5 Blades Rated Power: 400W Max. Power: 500W Service life: 15 years Start-up Wind Speed: 2.0m/s Cut-in Wind Speed: 2.5m/s Rated Wind Speed: 12m/s Survival Wind Speed: 50m/s Noise Level: &lt;20 dB (5m behind turbine @5m/s gusting) Low wind speed wind turbine could effectively utilize wind energy from low wind speed region,it&#039;s recommended to use low wind speed model in no hurricane areas with annual wind speed of less than 3.5m/s. Special installation 1: pitched rooftop Special installation 2: flat roof top Installation on site is simple, mainly including mounting blades on the hub, securing the hub to the turbine body, installing the nosecone on the blade hub and mounting wind turbine on the pole. Net weight: 22kg Gross weight: 25kg Package size: 1184626cm The safety and operation of wind turbine is closely related with matching components, correct pole installation, correct system cable connection, these three factors we could control and we have to do them well. However, wind turbines are installed outdoors, it is also close with natural environment situations, in case of force majeure factors, such as storm, earthquake, or attacked by hailstone, dust, wind turbines may be damaged. Although the high reliability of Tumo-Int wind turbine has been designed to run for 15 years without any maintenance, reliability and performance will be enhanced if you periodically inspect your system. And details can be found according to the product manual.