Grid fluctuations [RE-wrenches]

[Geoff Greenfield]

Howdy neighbor...

Double check your voltage drop calc for the inverter output AC homerun.  If
it is a long run, perhaps the grid is at the high end (but within spec) at
the meter but out of the operating window at the inverter.  SMA wants 1.5%
or less as I recall.

As for recording dataloggers - check out supco for some cheap tools... we
have one (it's deployed in the field or I'd offer to let ya borrow it) that
we got for $99 BUT I would have gone with a more expensive one with more
memory... depending on the time period the data point density changes and
you lose some peaks.

For a brighter energy future,

Geoff Greenfield
President
Third Sun Solar & Wind Power Ltd.
340 West State street, Unit 25
Athens, Ohio 45701
(740) 597-3111   fax: (740)597-1548
www.third-sun.com

Clean Energy - Expertly Installed



Date: Thu, 28 Jun 2007 17:12:35 -0600
From: Drake Chamberlin <drake.chamberlin at redwoodalliance.org>
Subject: Grid fluctuations 



Hi Wrenches,

We have a Sunny Boy that keeps shutting down for periods, then 
restarting.  We have measured grid voltage of 137 VAC per phase, and 
think that is the problem.  The utility company is claiming that the 
grid is fine.

Does anyone know where we can get a recording voltmeter to put on the 
grid.  There is no Internet access at the location.  We just want to 
be able to record the voltage over time.  We suspect that their may 
be short term spikes, which we would like to catch.

Thanks,

Drake 


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