<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>VARs? I was thinking something similar. Might have something to do with the phase angle at which the SW engages? <span>Capacitance might help.<span id="GD__CURSOR"> </span></span>Could be Switch bounce? Butterflies in China? Seems I remember a customer solving a similar problem by leaving <span>on<span id="GD__CURSOR"> </span></span>a nite light .. But that might have been a DR and nicad.. in a former life.<br></div><div><br></div><div>db<br></div><div><br>Dan Brown<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br><a href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>NABCEP #092907-44</div><div><br><br></div>
<blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;">
<div id="wmQuoteWrapper">
-------- Original Message --------<br>
Subject: Re: [RE-wrenches] Overcurrent error SW4024<br>
From: Dan Fink <<a href="mailto:danbob88@gmail.com">danbob88@gmail.com</a>><br>
Date: Wed, April 04, 2012 6:11 pm<br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<br>
Mac;<br>
We accidentally solved our problem similar to yours the other day.<br>
We were making some big PV racks, and had to move the welder to the<br>
other side of the shop, with no 240v outlet. So we added a 240<br>
extension cord to the welder. End of problem.<br>
Yes, Mac's problem *could* be an age / shorting/overcurrent problem<br>
in the 240V autotransformer.....but that's no explanation for our<br>
problem here. The welder is fine as frog hair here.<br>
So, i would say try adding some resistance to the line to the<br>
autotransformer, Mac. Our SW inverter "overcurrent" shutdown problem<br>
has nothing to do with overcurrent....it's some sort of line condition<br>
that tricks the SW into thinking there's a problem.<br>
DAN FINK<br>
<br>
<br>
On Thu, Mar 29, 2012 at 1:15 PM, <<a href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a>> wrote:<br>
> Boy, I'm haunted with the notion that we've seen this before.. years ago. I<br>
> want to say it was a simple fix. might have been something to do with NiCad<br>
> batteries. Maybe low battery voltage and high start currents. I just don't<br>
> remember.. maybe I wasn't here then.<br>
><br>
> db<br>
><br>
><br>
> Dan Brown<br>
> Foxfire Energy Corp.<br>
> Renewable Energy Systems<br>
> (802)-483-2564<br>
> <a href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>
> NABCEP #092907-44<br>
><br>
><br>
> -------- Original Message --------<br>
> Subject: Re: [RE-wrenches] Overcurrent error SW4024<br>
> From: Dan Fink <<a href="mailto:danbob88@gmail.com">danbob88@gmail.com</a>><br>
> Date: Thu, March 29, 2012 3:04 pm<br>
> To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
><br>
> Turning on other loads around the shop seems to work here. But we need<br>
> to have over 100 watts on (we are using lights) to prevent the<br>
> problem. It's a PITA, as it crashes the satellite internet, which<br>
> takes 20-60 minutes to boot back up.<br>
><br>
> DAN FINK<br>
><br>
> On Thu, Mar 29, 2012 at 12:12 PM, <<a href="mailto:penobscotsolar@midmaine.com">penobscotsolar@midmaine.com</a>> wrote:<br>
>> We've seen this type of problem twice with well pumps. Both times, the<br>
>> problem was with a short in the load side close to the pump. One was<br>
>> occasional, the other constant. Interestingly, running a large generator<br>
>> seemed to "fix" the situation to the customer. In both cases, we found the<br>
>> short, repaired it and both systems are still working well to this day.<br>
>> One used a transformer, the other was a single 4024SW.<br>
>><br>
>> Daryl<br>
>><br>
_______________________________________________<br>
List sponsored by Home Power magazine<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Options & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out participant bios:<br>
<a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br>
<br>
</div>
</blockquote></span></body></html>