... Rotor diameter (m) 1.7 Star-up wind speed (m/s) 3.0 Cut-in wind speed (m/s) 4.0 ... charge indicator, undervotage indicator, overtage indicator, indicator of battery voltage. protectionsolar reverse connection protection,overload and short-circuit protection ... , undervoltage and overvoltage protection of battery. 4) Package: Package weight (kg) 20kg Net weight ( ...