[RE-wrenches] UPS disturbance with SMA Inverters

[William Miller]

Bill:

We have extended these leads without consequence.

While I am a big E0Gauge fan, I'm not sure this is the tool for this job.
It looks like the requirement is to detect minute power quality problems
that might be affecting the UPS and I don't believe E-Gauge can detect
minute voltage changes or distortion on the waveform.

Interesting that this came up because I am having a very similar problem
with an SMA mini-grid system.  The customer has an expensive AV system and
the UPSs keep beeping.  I put a Dataq data acquisition system in place with
a high sample rate.  I am not sure this is the right tool either.  I can see
individual cycles and I can see the overall voltage, depending on the zoom
factor.  Finding one distorted wave or frequency excursion would be a real
challenge.

I think a purpose made recording power quality monitor is the proper tool.

Wm



Lic 773985
millersolar.com
805-438-5600


-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Bill Loesch
Sent: Tuesday, August 05, 2014 3:41 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] UPS disturbance with SMA Inverters

Hi Mac,

Have you ever tried adding more twisted pair lead length to the current
sensors? With favorable results?

Thanks,

Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094

On 04-Aug-14 4:20 PM, Mac Lewis wrote:
>  It does require that all of the monitored lines are relatively close 
> spatially (or you can get more egauges).



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