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*
[email protected] <mailto:[email protected]>
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, [email protected]
<mailto:[email protected]> <[email protected]
<mailto:[email protected]>> 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
<[email protected] <mailto:[email protected]>> 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!
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