Well pumps and SWs revisited [RE-wrenches]

[Matt Tritt]

In the case to the 5548, bigger is way not better. If you want stable
voltage and clean output, why not just use Exeltechs and a gen Wizard?
I've been quite content with the 4024's ability to start pretty awful
pumps, control generators and provide a fairly good approximation of a
sinewave ever since they first came on the market.

The DR is also an adequate but under-instrumented unit that works well
with most 115 volt loads, including booster pumps, but I've had many
complaints about their noise on telephones, especially when used with
dial-up modems. I guess these issues are some of the reasons that
Outback is here to save us all! No?

Matt T

-----Original Message-----
From: Ezra Auerbach, DragonSun Consulting [mailto:ezra at lasqueti.net] 
Sent: Thursday, October 02, 2003 1:20 PM
To: RE-wrenches at topica.com
Subject: RE: Well pumps and SWs revisited [RE-wrenches]


I'd guess someone somewhere has done the measurements.  Bottom line is
that bigger is not necessarily better in this case.  It comes down to
what you want.  Eric is correct, the 5548 holds its voltage much
steadier than its smaller siblings which sag mercilessly but start very
large and nasty loads.  If you want sable voltage use the 5.5 if surge
is what matters - and it tends to off grid - use the 4 kW models.  I'd
have thought that most folks new that by now.

Cheers,

Ezra

-----Original Message-----
From: Matt Tritt [mailto:solarone at charter.net] 
Sent: Thursday, October 02, 2003 12:48 PM
To: RE-wrenches at topica.com
Subject: RE: Well pumps and SWs revisited [RE-wrenches]


Has anyone actually measured or otherwise qualified the output of the
5548 as compared to the 4048 and the 4024 other than Xantrex employees?

Matt T

-----Original Message-----
From: Eric Smiley [mailto:Eric_Smiley at bcit.ca] 
Sent: Thursday, October 02, 2003 12:16 PM
To: RE-wrenches at topica.com
Subject: RE: Well pumps and SWs revisited [RE-wrenches]



Ray Walters said:
***
NO one has mentioned in this thread that the SW5548 is terrible at
surges. I've been disappointed that it trips its over current switch
when a lowly DR2424 can hang in there.
***

It's true the SW5548 doesn't surge as well as the 4kVA SW units. I
believe it's been discussed in the past on this list. The reason I was
given is that the 5.5 kVA unit was intended for more sensitive loads and
doesn't allow the voltage to sag as much as the smaller units when
starting large motor loads. Thus better power quality means less surge
ability.

Eric Smiley, BEng, MASc
Project Leader
Photovoltaic Energy Applied Research, Technology Centre
British Columbia Institute of Technology

NE25 - 3700 Willingdon Avenue
Burnaby, British Columbia
Canada V5G 3H2

phone: 604.432.8657    fax: 604.436.0286
esmiley at bcit.ca             www.tc.bcit.ca

The information contained in this E-mail is intended for the addressee
only.  If you have received this in error please delete it.

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