Unlike other fans and fan controllers available within the hydroponic market, the Systemair EC Fans and EC Fan Controllers will actually save you money, despite the initial cost.
RVK 315A1 (1361m³/ph) & Standard Twin Fan Speed Controller
Purchase/Initial Cost: £275
Yearly Running Costs (24/7, 365 days a year): £238*
5 Year Running Costs: £1188*
Box Fan 200mm (1401m³/ph) & Standard Twin Fan Controller
Purchase/Initial Cost: £299
Yearly Running Costs (24/7, 365 days a year): £363*
5 Year Running Costs: £1812*
Revolution Vector 250mm (1822m³/ph) & EC Fan Controller
Purchase/Initial Cost: £499
Yearly Running Costs (24/7, 365 days a year): £62*
5 Year Running Costs: £310*
So despite the Revolution Vector Fan & EC Fan Controller costing slightly more to purchase than other fan set-ups, anyone can see the benefits and long-term savings to be made.
Another way to look at it is like this; when a standard AC Fan is slowed down, it will still use the full power requirement to move the fans motor, despite the slower speed. However when an EC Fan is slowed down, the power is reduced too.
Power consumption at Full Power: 104W
Power Consumption at 20% Power: 104W
Revolution Vector EC Fan 150mm
Power Consumption at Full Speed: 77W
Power Consumption at 20% Speed: 14W