... : 1, Security 2,Noise 3,Wind resistance 4,Power curves The advantages of vertical axis wind turbines : 1, Security 2,Noise 3,Wind ... wind speed2m/s Work wind speed2-24m/sRotation speed150r/minNumber of blades5Turbine weight49kg Tower height6m Tower typeSteel (Q235B)Suggested battery ... and competitive price guarantee us a huge market all over the world , such as in Eastern Asia , Europe , North America ...