Hi about 20 years ago we used to build a soft start, it was a reduced voltage starter, composed of AC capacitors and a relay. Upon start from pressure switch the power would flow through capacitors? And shortly there after the relay would close after motor started to turn. It seems to me we also did it with large resistor ? My memory is not the best but others may have done same. I do not remember the type of motor. Also there us a hard start kit for a PSC motor. Modern soft starts are speed drives on 3 phase motors.
If i remember correctly or at all, i will send more information. On Fri, Jul 26, 2019, 9:03 AM Jeff Clearwater <je...@villagepowerdesign.com> wrote: > Hey Wrenches, > > Anyone have success using soft-start modules on well and sewage pumps to > lower the surge for off-grid inverters? > > The baby we are trying to tame is a 2 HP 15 amp, 53 LRA Omnivore Grinder > Pump - LSG200 series - single phase 230 Vac. > > Thanks! > > Jeff > > > ~~~~~~~~~~~ > Jeff Clearwater > Village Power Design > linkedin <https://www.linkedin.com/in/jeff-clearwater-0622a312/> > www.villagepowerdesign.com > cell - 413-559-9763 > ~~~~~~~~~~~~~~~~~~~~~~~ > > Jeff Clearwater wrote on 7/26/19 6:32 AM: > > Thanks Ray and Jerry, > > Great to hear from you both with your years of combined experience :) > > So yes looking at the 5 sec has me switching back to a trusty Radian - even > then from what you are saying it may not work. > > And you are right Ray - Outback is careful to rate the "overload > capability" in KVA rather than KW due most likely to voltage sag of course. > > So this 53 LRA 2 HP motor - if I can only trust the 5 second (50 A) might > not start - especially with other loads on the system? > > RADIAN SURGE RATINGS: > > Maximum Output Current > 1 ms peak 100 Amps AC at 240 VAC, 200 Amps AC at 120 VAC > 100 ms RMS 70.7 Amps AC at 240 VAC > > Overload Capability > 100 ms surge 16.97 kVa > 5 seconds 12 kVa > 30 minute 9 kVa > > Other's experience with 2 HP sewage pump or well pump motors on a Radian? > > Thanks! > > Jeff > > > Ray wrote on 7/25/19 5:48 PM: > > I only look at the 5 sec and 30 sec surge ratings to get an idea what an > inverter can really do in the real world. All those millisecond ratings/ > in rush current specs won't get a pump or motor started, and will basically > just get you into trouble. The reason they have those ratings in amps and > not watts, is that the voltage craters during that 100mS surge. > > I can't tell you how many times we tried to start a pump, compressor, or > large table saw, and the inverter just shut off, even though the "in rush > current" was within the theoretical inverter capacity. Actual Wrench list > testimonials are much more valuable than those arcane specs. > > Ray Walters > Remote Solar > 303 505-8760 > > On 7/25/19 5:15 PM, Jeff Clearwater wrote: > > Hey There Wrenches, > > So be advised that after a little research the SW dual stack will NOT > double the surge ratings of a single SW. > > But that brings me to my second question: > > What inverter surge rating should one refer to when looking at maximum > Inrush or LRA - 1ms? 100ms? 1 sec? > > Your engineering wisdom welcomed! > > Thanks, > > Jeff > > > > Jeff Clearwater wrote on 7/23/19 8:27 PM: > > Thanks for the tip! I'll check the firmware. > > Dave Angelini Offgrid Solar wrote on 7/22/19 9:11 AM: > > Hi Jeff, > > > > I am not going to guess if this will work, it should. I use XW's because > they start anything I have come across. > > If you do this, make sure but SW's have the latest and same firmware. > There were problems with stacked SW's early on in their development. > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > On Mon, 22 Jul 2019 07:26:07 -0700, Jeff Clearwater > <je...@villagepowerdesign.com> <je...@villagepowerdesign.com> wrote: > > Hey Esteemed Wrenches, > > So I recently built a power trailer with a single 4 KW (4048) Schneider SW > for a client with a moderate cabin lifestyle. > > But he lives on a high hill and even though his 2 HP Macerator is only > rated at 15 amps continuous that baby starts up with a whopping kick - > probably close to or at it's 53 Amps Locked Rotor rating. > > The SW has the following surge capability: > > SW 4048 Rated @ 240 Volts: > Continuous - 15.2 Amps 3700 Watts > 30 Minutes - 18.3 Amps 4400 Watts > 5 Secs - 29.2 Amps 7000 Watts > Max (100ms?) - 41 Amps - 9840 Watts > > Can I be confidant that 2 stacked SWs will start this baby? > > Any experience with similar macerators - or simply educated guesses? > > Thanks! > > Jeff > > -- > > > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > -- > ~~~~~~~~~~~ > Jeff Clearwater > Village Power Design > linkedin <https://www.linkedin.com/in/jeff-clearwater-0622a312/> > www.villagepowerdesign.com > cell - 413-559-9763 > ~~~~~~~~~~~~~~~~~~~~~~~ > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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