[RE-wrenches] Compressor motor/SW+5548

Mon May 30 13:00:13 PDT 2016

Yes, the SW4024 and SW4048 could start larger surge loads than the 
SW5548, because both allowed the output voltage to dip farther under 
surge. The 5548 was more tightly regulated in order to reduce the 
flickering caused by the voltage dip of a large motor under load.

I learned this around 2002 when I was designing Jane Fonda's GTWB system 
for her ranch in Pecos NM. We used three inverters: an SW4048 for 
background fridges, pumps and mechanicals, an SW5548 for normal house 
loads, and an Exeltech MX series for clean A/V & computer circuits. The 
two SWs were not stacked, running to separate 120V load centers. Still 
working, although she's no longer the owner. Original battery bank, 
still (Surrette 1104 AH(?) KS-series, two strings)...
Allan

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

**

On 5/30/2016 1:24 PM, Dan Fink wrote:
> boB, a spongey line on a load? Done it with windmills, never with a 
> load. Makes complete sense to me, I'll add that to the old bag of tricks.
>
> Dan Fink
> Adjunct Professor of Solar Energy Technology, Ecotech Institute
> IREC Certified Instructor™ for:
> ~ PV Installation Professional
> ~ Small Wind Installer
> Executive Director, Buckville Energy
> NABCEP Registered Continuing Education Providers™
> 970.672.4342 <tel:970.672.4342>
>
>
> On Mon, May 30, 2016 at 12:54 PM, bob at midnitesolar.com 
> <mailto:bob at midnitesolar.com> <bob at midnitesolar.com 
> <mailto:bob at midnitesolar.com>> wrote:
>
>
>     The (newer) SW5548 was harder on over current protection, mainly
>     because
>
>     it could put out more current than the SW4048...
>
>     One trick to try is to place a long(ish) extension cord between
>     the SW and the load to give it a wee bit of series resistance.
>
>     Doing this would often reduce that OCP and help motors to start.
>
>     boB
>
>
>     On 5/30/2016 11:03 AM, Dan Fink wrote:
>>     Does your air compressor have an unloader valve, or can you
>>     install one?
>>     That should do the trick, sounds like you are just running into
>>     the regular high surge current demand.
>>     Off the grid, compressors are in about the same nasty league as
>>     old well pumps as far as surge demand.
>>
>>
>>
>>
>>     Dan Fink
>>     Adjunct Professor of Solar Energy Technology, Ecotech Institute
>>     IREC Certified Instructor™ for:
>>     ~ PV Installation Professional
>>     ~ Small Wind Installer
>>     Executive Director, Buckville Energy
>>     NABCEP Registered Continuing Education Providers™
>>     970.672.4342 <tel:970.672.4342>
>>
>>
>>     On Mon, May 30, 2016 at 10:46 AM, Jeremy Rodriguez
>>     <allsolarjeremy at msn.com <mailto:allsolarjeremy at msn.com>> wrote:
>>
>>         Hello
>>         I've got an SW+5548 that will barley start my air compressor.
>>         Once it does run it shows 17 Amps on the inverters loads
>>         meter. During start up it reads 60+ amps.
>>         Do you think better capacitors would help the situation?
>>         BTW I've never ran the compressor off grid prior.
>>         I even tried #8 from the Breaker to the pressure switch,
>>         about 9ft, with no benefit. The compressor will only start
>>         with the tank completely empty.
>>
>>         Jeremy Rodriguez
>>         Solar Installation And Design Expert
>>         All Solar, Inc.
>>         1463 M St
>>         Penrose Colorado 81240
>>
>>         Sent by Jeremy's iPhone. Sorry for typos and shorthand!
>>         _______________________________________________
>>         List sponsored by Redwood Alliance
>>
>>         List Address: RE-wrenches at lists.re-wrenches.org
>>         <mailto:RE-wrenches at 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
>>         <http://www.re-wrenches.org/etiquette.htm>
>>
>>         Check out or update participant bios:
>>         www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>
>>
>>
>>
>>     _______________________________________________
>>     List sponsored by Redwood Alliance
>>
>>     List Address:RE-wrenches at lists.re-wrenches.org
>>     <mailto:RE-wrenches at 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
>>     <http://www.re-wrenches.org/etiquette.htm>
>>
>>     Check out or update participant bios:
>>     www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>
>
>
>     _______________________________________________
>     List sponsored by Redwood Alliance
>
>     List Address: RE-wrenches at lists.re-wrenches.org
>     <mailto:RE-wrenches at 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
>     <http://www.re-wrenches.org/etiquette.htm>
>
>     Check out or update participant bios:
>     www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>
>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at 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
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20160530/3a09b774/attachment-0002.html>