The MacroVoltaic fan is the only solar high volume low speed (HVLS) industrial fan on the market. The MacroVoltaic is designed to operate in a variety of methods to best meet individualized consumer needs. The system can be used as a stand-alone solar fan, a solar fan with auxiliary backup, a solar fan with battery backup, or a solar fan with both auxiliary and battery backup. Solar HVLS Industrial Fan by MacroAir Technologies.