Posted by anthonymmfalcone on October 3, 2006, 10:02 am
Hi Readers,
I've a dual voltage jet pump on my well for domestic water to my home.
It currently runs on 240VAC, but the case also shows that it can be
rewired to run on 120VAC. Is there any advantage to running on 240 vs.
120? Less wear-and-tear? Less start-up current maybe?
Your comments are appreciated.
-Anthony M. Falcone
Posted by tgdenning on October 3, 2006, 11:10 am
anthonymmfalcone@yahoo.com wrote:
> Hi Readers,
> I've a dual voltage jet pump on my well for domestic water to my home.
> It currently runs on 240VAC, but the case also shows that it can be
> rewired to run on 120VAC. Is there any advantage to running on 240 vs.
> 120? Less wear-and-tear? Less start-up current maybe?
> Your comments are appreciated.
> -Anthony M. Falcone
Yes.
Most fundamental, 2 times volts = 1/2 times amps. So all 240V thingies
waste less energy in the same size wires than 120V thingies.
More to it in motor construction but not that relevant here.
-tg
Posted by DJ on October 3, 2006, 11:31 am
anthonymmfalcone@yahoo.com wrote:
> Hi Readers,
> I've a dual voltage jet pump on my well for domestic water to my home.
> It currently runs on 240VAC, but the case also shows that it can be
> rewired to run on 120VAC. Is there any advantage to running on 240 vs.
> 120? Less wear-and-tear? Less start-up current maybe?
> Your comments are appreciated.
Pretty much exactly that. AT 120v AC, it would draw twice the amperage
during startup and running, with all the resulting issues of requiring
larger wires, fuses, etc. Same overall power useage, though, more or
less.
The 120v option is seen most often in situations like generator-powered
cottages, such like that.
DJ
Posted by anthonymmfalcone on October 3, 2006, 11:50 am
DJ wrote:
> The 120v option is seen most often in situations like generator-powered
> cottages, such like that.
> DJ
That's my ultimate point: I'm considering a backup generator and this
pump is the only (absolutely necessary) 240v load in the house. I'm
figuring I may be able to get by with just a 110v generator, provided I
switch the pump to 110vAC and provided I account for all other
necessary loads and startup currents.
Posted by DJ on October 3, 2006, 1:06 pm
anthonymmfalcone@yahoo.com wrote:
> DJ wrote:
> > The 120v option is seen most often in situations like generator-powered
> > cottages, such like that.
> >
> > DJ
> That's my ultimate point: I'm considering a backup generator and this
> pump is the only (absolutely necessary) 240v load in the house. I'm
> figuring I may be able to get by with just a 110v generator, provided I
> switch the pump to 110vAC and provided I account for all other
> necessary loads and startup currents.
You'd have two choices at that point, actually. Gotta be careful doing
this. You'll want to make sure the wiring and fusing will handle the
120V AC load (double amperage of what it was). If it will, you're all
well and good, get someone competent to rewire the feed if you're not
(not an insult, I mean trade certified), then follow the wiring
instructions on the junction box inner lid or on the data plate and
you're good to go.
If it doesn't, you have two choices: re-run the proper wiring and
change the fuse, or get a step-up transformer (google Xantrex or
Outback 240 transformer) and put it (have it put) at the breaker panel,
and just change the fuse to accomodate the 120v load. Then the pump can
remain wired at 240 but run off a 120v supply.
Alot of times, though, the pump is in a basement, and running a new
line is simple and cheap, not like putting in a DC powered ceiling fan
;-).
DJ
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> I've a dual voltage jet pump on my well for domestic water to my home.
> It currently runs on 240VAC, but the case also shows that it can be
> rewired to run on 120VAC. Is there any advantage to running on 240 vs.
> 120? Less wear-and-tear? Less start-up current maybe?
> Your comments are appreciated.
> -Anthony M. Falcone
Yes.