Oulu is a China leading manufacturer of small wind turbines horizontal and vertical since the year 2007. We also produce solar hybrid inverters off grid and on off grid, solar controller inverter with MPPT low frequency and high frequency, wind solar controller, wind solar hybrid controller inverter integrated machine,etc. Welcome for a prce now by whatsapp or wechat +86 18625180950 or email bonnie@china-oulu.com