EC vs. AC Fans: Which One Really Costs Less?

EC vs. AC Fans: Which One Really Costs Less?

Ian
Ian
07 Apr 2017

Want to save energy? There’s one simple way to do it – swap your AC fan for an EC fan. 

By swapping your AC fan to an EC fan, you’ll save loads on running costs:

Savings Savings
Savings Savings

* based on fans operating 365 days a year, with a unit cost of £0.17 for 1kW/h

 
  EC Fan + Control
AC Fan + Step Control
AC Fan + Resistor Control
Initial costs  £448 £454.90 £264.90
Yearly energy costs £49.46 £189.06 £324.09
Initial + 1yr energy £497.46 £643.96 £796.99
Initial + 5yr energy £695.30 £1400.20 £2075.35

It’s worth remembering that when fans are slowed down with a resistor controller, you’ll get a loud buzzing noise and your fan life will be reduced!

Let’s break it down…

Initial Costs

EC Fan + EC Controller

EC Fan + EC Controller EC Fan + EC Controller

Initial cost: £448

AC Fan + Resistor Controller:

AC Fan + Resistor Controller: AC Fan + Resistor Controller:

AC Fan + Step Transformer Controller:

AC Fan + Step Transformer Controller AC Fan + Step Transformer Controller

Initial cost: £454.90

Running Costs

Here's what the overall running costs are based on. 

Day time running 6 hours a day:

976m3/h with a filter Pressure of 100pa

  EC Fan + Control
AC Fan + Step Control
AC Fan + Resistor Control
Wattage 82.4 Watts 162 Watts 226 Watts
Yearly energy costs £31.18 £61.30 £85.52

  

50% running 6 hours:

610m3/h with a filter, pressure drop 50pa

  EC Fan + Control
AC Fan + Step Control
AC Fan + Resistor Control
Wattage 26.7 Watts 142 Watts 226 Watts
Yearly energy costs £10.10 £53.74 £85.52

  

30% night time running 12 hours a day:

366m3/h with a filter, pressure drop 20pa

  EC Fan + Control
AC Fan + Step Control
AC Fan + Resistor Control
Wattage 10.8 Watts 97.8 Watts 226 Watts
Yearly energy costs £8.18 £74.02 £171.05

  

You'll make a huge saving every year, just by using an EC fan:

  • EC = £65.85 saving a yr (over step/transformer)
  • EC = £162.87 saving a yr (over resistor)

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If you do Stick with AC Fans...

  

If you do stick with an AC fan, you can reduce running costs by using a Control Freak Dynamic Frequency Fan Controller.

Running costs won’t be as low as when you use an EC fan, but they’ll be much lower than if you use a resistor or transformer AC controller.

Control Freak Control Freak
Ian
Ian
About the author

Ian's our Sheffield shop manager. He loves tinkering in the greenhouse. Drop by to see what he's growing.

GroWell Hydroponics Sheffield

Call GroWell Sheffield:
0114 243 9242