Pool motor
#1
Member
Thread Starter
Join Date: Feb 2005
Location: Northern New Jersey
Posts: 468
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Pool motor
Hello,
My son just bought a house with a pool. The seller said she ran the motor continuously during the season. She even removed he pins from the timer. The guy at the pool supply store said not necessary, the filter should run 8-12 hours per day. My son is freaking out about the electric bill (which hasn't come yet). So.....being a good dad I figured I would ask the experts here.
The basic question is: if the motor in the picture runs all the time, what is the equivalent number of 100 watt light bulbs? 1? 100? 1000?
Thanks.
My son just bought a house with a pool. The seller said she ran the motor continuously during the season. She even removed he pins from the timer. The guy at the pool supply store said not necessary, the filter should run 8-12 hours per day. My son is freaking out about the electric bill (which hasn't come yet). So.....being a good dad I figured I would ask the experts here.
The basic question is: if the motor in the picture runs all the time, what is the equivalent number of 100 watt light bulbs? 1? 100? 1000?
Thanks.
#2
Group Moderator
The motor could draw as much as 2'200 watts or 2.2kw. If your son looks at his power bill he can see how much he pays per kwh he can figure out how much it costs per hour to operate. If it's $.10 per kwh the it will cost about $.22 per hour to operate the pump.
#4
Maybe I'm missing something here, however the label on the motor says that the power consumption is 1.1KW. Why are you stating that the consumption is double that (2.2KW)?
#5
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 38 Upvotes
on
30 Posts
I agree with Bob. For continuous operation simply multiply the electrical rate (cost per kilowatt-hour) by 1.1 to come up with the cost of operation per hour of use.
Note well that some utilities have a flat rate structure (same cost per kWh regardless of total kWh's consumed) and other utilities will have a graduated rate structure that changes the cost per kWh depending on the total consumption over the billing period. These latter often will have a "block" of power at a certain cost and if the consumption exceeds that block they have an additional block of power at a higher cost up to a certain total and then maybe a third and possibly fourth tier that increases the cost per kWh of the higher blocks. It can get pretty complicated trying to calculate the total electric bill (or any specific usage) with these latter rate structures.
Further, there could be additional charges for fuel cost adjustments, taxes and other items.
Note well that some utilities have a flat rate structure (same cost per kWh regardless of total kWh's consumed) and other utilities will have a graduated rate structure that changes the cost per kWh depending on the total consumption over the billing period. These latter often will have a "block" of power at a certain cost and if the consumption exceeds that block they have an additional block of power at a higher cost up to a certain total and then maybe a third and possibly fourth tier that increases the cost per kWh of the higher blocks. It can get pretty complicated trying to calculate the total electric bill (or any specific usage) with these latter rate structures.
Further, there could be additional charges for fuel cost adjustments, taxes and other items.
#6
Group Moderator
I think you are correct. I did the max amperage x voltage to come up with the wattage. The 1.1 is probably more accurate for it's running power consumption.
#7
the filter should run 8-12 hours per day.
I run mine a maximum of 12 hours a day and that is plenty.
#8
Member
Nameplate HP rating on a motor is at the output shaft. Since motors are less than 100 percent efficient, your motor uses 2.1kw (nameplate voltage x current) to produce 1.5 HP (nameplate 1.1 kw). At 50 percent efficient. I would run it as little as possible. Your son's electrical meter spins at the 2.1kw value when the pump motor is operating.
#10
The 1.5 HP / 1.1 kW ratings are the mechanical output power of the motor.
The 230V * 9.3A = 2.1 kW is the maximum electrical input power to the motor.
The difference is what gets lost to inefficiency (heat).
In this case, the motor draws up to 2.1kW which in actual use depends on how much load is on the pump. The elevation head, pipe friction loss and back pressure from filtering elements will all effect actual energy use, but it should not exceed 2.1 kW. In most areas of the country I would estimate $0.15-$0.20 per hour but that could double in some expensive areas.
The 230V * 9.3A = 2.1 kW is the maximum electrical input power to the motor.
The difference is what gets lost to inefficiency (heat).
In this case, the motor draws up to 2.1kW which in actual use depends on how much load is on the pump. The elevation head, pipe friction loss and back pressure from filtering elements will all effect actual energy use, but it should not exceed 2.1 kW. In most areas of the country I would estimate $0.15-$0.20 per hour but that could double in some expensive areas.
#11
Member
Thread Starter
Join Date: Feb 2005
Location: Northern New Jersey
Posts: 468
Upvotes: 0
Received 0 Upvotes
on
0 Posts
@ibpooks: so......utlity rate of 12.82 cents / kwh and 1.1 kwh (from the label) works out to 14 cents per hour to operate ?.
Roughly $100 per month?
Is that right ?
Roughly $100 per month?
Is that right ?
#12
Unless I missed it, no one asked the most important question: how many gallons of water in the pool? That will inform how many hours per day to run the pump.
3450 RPM single speed is overkill unless the pool is huge. To save money long term, replace this beast with a modern variable-speed pump and run at lower speed.
3450 RPM single speed is overkill unless the pool is huge. To save money long term, replace this beast with a modern variable-speed pump and run at lower speed.
#16
My pool is 20'x40'x9' deep. Roughly 26k gallons. As I mentioned... I have almost the same exact pump you have. I just rebuilt it over the winter as the bearings were getting noisy. I'm guessing it's better than 20 years old..... probably closer to 25 years old.
#17
@ibpooks: so......utlity rate of 12.82 cents / kwh and 1.1 kwh (from the label) works out to 14 cents per hour to operate ?.
Roughly $100 per month?
Roughly $100 per month?