Load control [RE-wrenches]

[Doug Pratt]

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The C40 makes a fairly expensive voltage-controlled switch. It *ought*
to work just fine, but as we've seen in other applications, the C-series
is sometimes sensitive to electronic noise put out by other appliances.

I'd suggest if simple voltage-sensitive switching is all you want, then
use a simple voltage-sensitive switch to do the job. Solar converters
has one that's adjustable from 10 to 60 volts, with a 30A contactor on
board. I think cost is in the $40-$50 range (I'm away from my office
just now.) Find 'em here: http://www.solarconverters.com/index.html 

Cheers,
Doug Pratt


-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org] 
Sent: Friday, November 05, 2004 10:59 AM
To: RE-wrenches at topica.com
Subject: Load control [RE-wrenches]


Friends:

I am working on a system for load control in which the load is a 240
well 
pump.  It worked  well for about a year using a Xantrex C40 to drive a
two 
pole relay.

About two months ago the client complained that the well would
occasionally 
run until the battery V got low enough for the inverter to shut of.  We 
could never observe this happening, but with my new data acquisition 
system, we recorded it doing this.  The battery voltage went below the
set 
point of 22 volts, but the C40 continued to drive the relay.

I had another used C40 in the shop so I swapped them out.  I recorded 
performance for another 24 hours and it worked well (excuse the pun) and
I 
then removed the recording equipment.

This morning I received a message from the client indicating the unit
had 
yesterday again discharged the batteries.  Unique to this situation is
the 
fact that we had such a rainy day that I doubt the C40 reached the 
reconnect point.

Have any of you used a C40 to control loads?  to what success?

Thanks,

William Miller

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