Energy Usage, is my Math Right.

[SteveMM62Reef]

I’m looking at two pumps, First Pump, AC Voltage, runs at 110 watts , yearly wattage 963,600 equals 936.6 kW Times 0.15 per Kilowatt Equals $144.54 per year run cost. Second Pump DC Voltage, runs at 26 watts, yearly wattage 227,760 equals 227.76 kW Times 0.15 per Kilowatt Equals $34.16 per year run cost. This is 24 hours times 365, equals 8,760 run hours in a year.

 

[BanjoBandito]

I didn't run the numbers, but your equation is correct.

 

[gbroadbridge]

I’m looking at two pumps, First Pump, AC Voltage, runs at 110 watts , yearly wattage 963,600 equals 936.6 kW Times 0.15 per Kilowatt Equals $144.54 per year run cost. Second Pump DC Voltage, runs at 26 watts, yearly wattage 227,760 equals 227.76 kW Times 0.15 per Kilowatt Equals $34.16 per year run cost. This is 24 hours times 365, equals 8,760 run hours in a year.

Correct.

Is the DC pump power specified as the DC wattages, if so there are power conversion losses converting from AC to DC which you need to add in.

 

[workhz]

Are they similar pumps? That’s quite the spread in terms of watts.

Which pumps are you comparing?

 

[jda]

Math looks OK. The actual numbers might not be. The spread in wattage is not usually that dramatic if you are using similar pumps with similar purposes... and you factor in the loss from the power supply. I have AC pumps at 30-40 watts that move as much water as a DC pump at the same wattage... but they are flow type of pumps and not high-head mag-drive type of pumps.

You cannot compare a Mag 9.5, for example at 950 GPH and 100+ watts to a Tunze 1073.60 which throttled back to about 950 GPH is about 45 watts, or a DC low-head pump which will be about the same.

If you are saving a bunch of wattage on a pump, then one end of the comparison was likely chosen poorly. ...or the advertised wattage does not include the power supply or is under-represented.

Tunze 1073 series or Sycce Sincra Silent both use about the same wattage as similar DC pumps, but they are not high head or high pressure, just like the DC pumps.

 

[Sean Clark]

Now factor in the cost of the AC and DC pumps and life expectancy of each...

 

[blaxsun]

I had a Sicce Silent 5.0 pump (1321 Gph) and it was drawing 105 watts. If I wanted to reduce the flow I had to close the flow dial - and it still consumed 105 watts. I replaced it with a Sicce SDC 6.0 (1452 Gph) variable and it's running 23 watts. The difference is about $9/month, so the SDC 6.0 will pay for itself in just over a year - not too mention the variable speed, controller, WiFi, IOTA, etc.

 

[gbroadbridge]

I had a Sicce Silent 5.0 pump (1321 Gph) and it was drawing 105 watts. If I wanted to reduce the flow I had to close the flow dial - and it still consumed 105 watts. I replaced it with a Sicce SDC 6.0 (1452 Gph) variable and it's running 23 watts. The difference is about $9/month, so the SDC 6.0 will pay for itself in just over a year - not too mention the variable speed, controller, WiFi, IOTA, etc.

How did you measure the 23 Watts?

 

[blaxsun]

How did you measure the 23 Watts?

I had both plugged into my Apex EB832 energy bar, and it gives me realtime energy usage. You can plug-in your actual electricity cost in kWh and it gives you the cost of running various equipment.

 

[SteveMM62Reef]

Are they similar pumps? That’s quite the spread in terms of watts.

Which pumps are you comparing?

AC Voltage Pump is a Danner Supreme 1200 at 110 watts
DC Voltage Pump is a Hydor Seltz D DC 750 at 32 watts.

I have also looked at the Hydor Seltz D DC 1000 at 32 watts

 

[workhz]

Can’t find curves to compare those 2-3 pumps. As others have mentioned I'm going to guess the extra energy used gets you more flow at bigger heights.

My in tank powerheads are 2 tunze 6040 (DC) that supposedly use 13W each to pump 1200g/hr and a tunze 6020 (AC) that uses 4W to pump 660g/hr .... so I don't quite understand that math.