[RE-wrenches] Wattage 1/2 HP vs 1HP septic pumps
Dana
dana at solarwork.com
Sun Oct 29 10:52:53 EDT 2017
That’s where I was confused the septic designer said only 10% more. It's not just flow it is this ridiculous excess pressure they require
----------------------------------------------------------------------------
Dana Orzel Great Solar Works, Inc.
208.721.7003 dana at solarwork.com
Idaho Contractor - # 028765 Idaho PV # 028374
NABCEP # 051112-136 www.solarwork.biz
"Responsible Technologies for Responsible People since 1988"
Please consider the environment before printing this email.
-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Darryl Thayer
Sent: Sunday, October 29, 2017 7:40 AM
To: newrewrenches <RE-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Wattage 1/2 HP vs 1HP septic pumps
But the question you asked as to which uses more energy, i expect they use tbe same or close to the same, the 1/2 hp runs 2x longer.
On Oct 29, 2017 6:24 AM, "Chris Mason" <cometenergysystems at gmail.com> wrote:
If you can get the Class rating of the motor, it will tell you a lot about the start current requirements of the pump.
On Sun, Oct 29, 2017 at 4:29 AM, Darryl Thayer <darylsolar1 at gmail.com>
wrote:
> Hi, Dana, I know you have a different situation using a sewage ejector
> (grinder pump) but I have a customer that has a 1/2 HP well pump. I
> do
not
> know the drawdown, I think it is 60 feet. It runs from an Outback VFX
> 3648, and a 4000 Watt autotransformer standard across the line starter.
It
> has never failed to start. Nor does it "blink the lights", (running
> since
> 2004?) It runs at 350 to 400 watts into a 20-gallon diaphragm tank
> operating from 40 to 60 PSI. Using Egauge on the 10 Minute scale, the
peak
> seems to be about 3x the running load or 1200 to1500 Watts lasting
> less than 1 second. In providing a family of two adults, the well
> pump is not
a
> dominating load. On the other hand, I had a customer with a 1.5 HP
> pump that I could not reliably start on a similar setup with a single FX 3548.
> The Radian is, of course, a much bigger animal.
>
> On Fri, Oct 27, 2017 at 3:45 PM, Dave Angelini Offgrid Solar <
> offgridsolar at sti.net> wrote:
>
> > I am with Windy! Having 1/2 HP and up anywhere offgrid is a problem
> > if
it
> > does not soft start. It will cause dimmed LED's to flicker and just
> > the surges that really are avoidable. Use soft start! There is not a
> > reason these days to prove that a Radian or XW will start a motor
> > that bangs
the
> > inverter to start. The only case I make for large old pump tech like
> these
> > is if it is for a fire suppression pump, in addition to a nice 3/4
> > HP Grundfos home water pump.
> >
> > Dave Angelini Offgrid Solar
> > "we go where powerlines don't"
> > http://members.sti.net/offgridsolar/
> > e-mail offgridsolar at sti.net
> > text 209 813 0060
> >
> >
> > > Really good to hear & thanks Chris.
> > > I just installed this system at our new home that we will be
> > > showing
> as a
> > > demonstration home. I come from the late '80s days of PV and a 1
> > > HP
> pump
> > > was a major no-no back when.
> > > *Windy passed along a soft start suggestion & I was going to put a
time
> > > clock turning on from 10AM-2PM every day to utilize a fuller bank.
> > > I
> will
> > > look at the SOC option on the Radian, but it is 200+' away from
> > > the
> > septic
> > > controller and conduit is in the ground.
> > > We have a HUP 2500 AHR/48-volt bank & 6,400 watt of PV tracked in
> > > a
n-s
> > > canyon that limits the PV collection to 5 hours on a December day,
that
> > so
> > > far even running a 3/4 HP air compressor all day/every day-7 days
> > > a
> week
> > > has never dropped at night more than 5%.
> > >
> > > ------------------------------------------------------------
> > ----------------
> > > Dana Orzel Great Solar Works, Inc.
> > > 208.721.7003 dana at solarwork.com
> > > Idaho Contractor - # 028765 Idaho PV # 028374
> > > NABCEP # 051112-136 www.solarwork.biz
> > > "Responsible Technologies for Responsible People since 1988"
> > > ï Please consider the environment before printing this email.
> > >
> > >
> > > -----Original Message-----
> > > From: RE-wrenches
> > > [mailto:re-wrenches-bounces at lists.re-wrenches.org]
> On
> > > Behalf Of Chris Mason
> > > Sent: Friday, October 27, 2017 5:51 AM
> > > To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> > > Subject: Re: [RE-wrenches] Wattage 1/2 HP vs 1HP septic pumps
> > >
> > > What's the problem with the 1H pump you anticipate? We live on a
> > > 8KW Radian and it's very robust. We have load management relay
> > > system to handle the dryer, it's only allowed to work above 95% state of charge.
> > > Since your lift station has range, i.e., it doesn't have to work
> > > every minute of the day, you can control it so it works only
> > > during a SOC
> range
> > > or Time of Day range. You can also turn off other loads so there
> > > is
> > enough
> > > power. If you run the lift pump during the night, there is less
> > > chance
> of
> > > a convection oven running at that time. Or mid morning when
> > > everyone
is
> > at
> > > work. Having time control or SOC control is very handy.
> > >
> > > On Wed, Oct 25, 2017 at 9:37 PM, Dana <dana at solarwork.com> wrote:
> > >
> > >> Ok all you whiz kids, bozos, & bolos:
> > >>
> > >>
> > >>
> > >> If I have a septic lift pump [off grid ouch] at 1HP/240
> > >> vac/8-amps to meet all the usual state required overkill in
> > >> septic design & a ½
> > >> HP/240 vac/4.9-amp pump would do the same job but it will take
> > >> 10% more time to dose 800 gallons.
> > >>
> > >> Powered by an 8 KW Outback Radian inverter.
> > >>
> > >> From a load point of view and a 240-volt 3 phase wild AC well
> > >> pump limiting the overall surge and general wattage is the
> > >> smartest move, but; Which pump will use less overall power? We
> > >> are using 240 volt to utilize both inverters and drop the load on
> > >> either half of the Radian inverter.
> > >>
> > >> Is there a smarter lift pump to use? ECM motor? Permanent magnet?
> > >>
> > >>
> > >>
> > >> ------------------------------------------------------------
> > >> ----------------
> > >>
> > >> Dana Orzel Great Solar Works, Inc.
> > >>
> > >> 208.721.7003 dana at solarwork.com
> > >>
> > >> Idaho Contractor - # 028765 Idaho PV # 028374
> > >>
> > >> NABCEP # 051112-136 www.solarwork.biz
> > >>
> > >> "Responsible Technologies for Responsible People since 1988"
> > >>
> > >> P Please consider the environment before printing this email.
> > >>
> > >>
> > >>
> > >>
> > >>
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> > >
> > > --
> > > Chris Mason
> > > NABCEP Certified Solar PV Installerâ„¢ Solar Design Engineer
> > > Generac Generators Industrial technician
> > >
> > > www.cometsolar.com <http://www.cometenergysystems.com>
> > > 264.235.5670
> > > 869.662.5670
> > > Skype: netconcepts
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> >
> > Dave Angelini Offgrid Solar
> > "we go where powerlines don't"
> > http://members.sti.net/offgridsolar/
> > e-mail offgridsolar at sti.net
> > text 209 813 0060
> >
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--
Chris Mason
NABCEP Certified Solar PV Installer™
Solar Design Engineer
Generac Generators Industrial technician
www.cometsolar.com <http://www.cometenergysystems.com>
264.235.5670
869.662.5670
Skype: netconcepts
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