I was wondering where to get objective information on energy cost comparison
the same device (air conditioner) in 3 phase vs single phase. I will be
getting a new condenser
next season (maybe 3.5 to 5 ton), and 3 phase is available, but I would need
to justify putting in a panel for it.
I already have adequate panel space in single phase.
Natural gas has gone up quite a bit here, and I might consider an all
electric heat pump, as well.
I'd would like to have 3ph anyway for machinery, etc, but it would help the
decision if the a/c would actually run cheaper. Someone was telling me that
electric meters are more weighted towards amperage, than just wattage, but I
have my doubts on that.
I know where I live 3 phase for a residence is an act of god or produce load
calculations for something like 100 kw demand. If I were you I would look
into what it will cost for an phase service then look at the cost of an
single phase air conditioner. I seriously doubt that there is any payback.
You must contact your utility to see what the rate differences are. 3 phase
will no doubt have an demand charge maybe more. Unless you have an machine
shop that runs 18 hours a day your probably tilting at windmills.
An 3 phase motor does draw less amps but the kwh is about the same. An horse
power is still an horse power whether it be 3 phase or single phase. Wire
sizes are smaller with 3 phase and all of the protective devices are smaller
in size and usually more in initial cost.
Bill, I don't know where you live, but many utility companies won't give you
a 3 phase service at a single family house and because 3 phase is generally
for commercial and industrial uses, they often charge at a higher rate
Actually, my service type with the utility company is already 3 phase. It's
over that way for years since there had been a 3 ph meter in the building
I inquired about this and there is no difference in my cost to change the
wrote in message
This is Turtle.
The ideal you have is full of holes as to try to burn less electric as cost goes
by having a 3 phase hvac system. Most all 3 phase equipment has a SEER rating of
7 to 9 seer and just a few have 9.8 seer rating but really rare. Let's say you
buy the highest seer rating they make 10 seer in a 3 phase hvac system and it
cost you $100.00 a month to run it. If you would buy a 14 seer in single phase
hvac system and the 3 phase will cost you $100.00 a month to run it. The 14 SEER
single phase hvac system will cost you $60.00 a month to run it.
3 phase 10 seer hvac system = $100.00 a month to run it.
Single phase 14 seer hvac system = $60.00 a month to run it.
Now Try this out !
Single phase 16 seer hvac system = $40.00 a month to run it.
Which one sounds better to pay for ''''' $100.00 a month '''''' or ''''' $40.00
a month '''''' to cool your building?
This is Turtle.
The 3 phase compressor may run very cheaply but the compressor is what that is
rated here and the system as a whole is not rated. Cost to operate is rated in
seer and not in the out put of A compressor but the system as a whole.
The highest seer rating of any 3 phase system know to man today is a 10 seer
rating and single phase systems have rating of 16 seer + .
No matter how you look at it 3 phase is a electric hog made to even run on low
voltage where a single phase will not run on low voltage!
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.