SW+ Voltage Sag [RE-wrenches]

Matt Tritt solarone at charter.net
Fri Aug 13 19:56:52 PDT 2004


 

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  Hmmmmmm.

  You say that you're running a 2548 on 2/0 inverter cables. First-off, my
recollection about the SW 12 and 24 volt versions is that they actually
require 4/0 cables to begin with becuase of the possibility of a 400 amp
surge under certain startup conditions.

  It also sounds like the batteries are on the low side, which also doesn't
help much, but 175 amps draw? I hope this is on your Skillsaw and not the
Staber. ;-)

  How long are your inverter leads and how big is the battery bank?

  What is the problem with the Washer?

  Matt T
  ----- Original Message ----- 
  From: "Ray Walters" <ray at solarray.com>
  To: <RE-wrenches at topica.com>
  Sent: Friday, August 13, 2004 10:46 AM
  Subject: SW+ Voltage Sag [RE-wrenches]




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  >Dear esteemed colleagues;

  I am currently troubleshooting a Staber Washer control malfunction on an
  Xantrex SW2524+ inverter. What I found curious is that the voltage sags
  down to 88 VAC rms for about a tenth of a second during starting surge. I
  am using a worm drive circular saw after to test. Measurements are at the
  inverter AC terminals with a Fluke 89 set to normal MIN capture.(the fast
  capture would get the bottom of the wave form itself) I also measured the
  DC side and found the voltage to be 24.6 vdc at rest with the surge
pulling
  it down to 22.9 vdc (again regular MIN capture on the Fluke). MIN volts
for
  0.1 secs at the battery terminals was 23.2 vdc. The DC current surge
  measured at the shunt block with the Fluke was an amazing 175 amps for 0.1
  secs. AC current was harder to measure surge, but I saw a 27 amp peak at
  the Inverter's onboard meter.
  My question is this: Is it normal to see a temporary voltage sag like this
  when powering a heavy inductive load. I rechecked all my connections AC
and
  DC. I looked for volt drop at any tell tale points, etc. I am thinking its
  an inductive issue with the DC cables, and so my next visit I wanted to
  upsize the cables to 4/0 and twist the cables around each other.
Everything
  else on the system seems to work great, other than occasionally a UPS box
  for the computer beeps, again with a start surge from another appliance.
  Your feedback, wisdom, comments, & of course criticisms are all greatly
  appreciated.


  Ray Walters
  ray at solarray.com
  President, SolarRay, Inc.
  NABCEP Certified Solar PV Installer
  BS Mechanical Engineering, UT Austin 88
  Returned US Peace Corps Volunteer

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