SW+ Voltage Sag [RE-wrenches]

[Ray Walters]

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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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