<div dir="ltr">Wrenches... <div><br></div><div>At my former employer this same thing actually occurred with their controllers about 7-9 years ago... caused a bit of a stink back then until we did some research on the phenomenon. Jay was correct in that the right circumstances need to line up for the customer and most metering even see this with the way products are sampling. </div><div><br></div><div>This is also combined with an effect called "Coup De Fouet" or whip effect. There are a lot of articles about the loading of a battery how the battery voltage acts like the end of a whip, when you look at the DC voltage over time on a scope. This can occur in the reverse at the end of the charge with the right circumstances. </div><div><br></div><div>When batteries are charging and they are near their peak and you attempt to remove the charge, especially if there is no or very little load on the batteries and you try to stop charging, the chemical reaction within the battery is still occurring even without the source coming from the controller. It takes some time 3-4 mins with no load for the chemical reaction to slow down, during this time you can see a voltage surge, with some of the testing we did we saw as high as 8-10 volts jump for 30-180 seconds... If the controller or monitoring device "samples" the voltage at this time you are going to get bad voltage reading. </div><div><br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><table border="0" cellspacing="0" width="100%">
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<br><div class="gmail_quote">On Tue, Jul 18, 2017 at 5:25 PM, Jerry Shafer <span dir="ltr"><<a href="mailto:jerrysgarage01@gmail.com" target="_blank">jerrysgarage01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Wrenches<div>The Outback system with grid connection would be programmed for grid connection all the way from the inverter to the Outback FM CC, using a midnite CC this option may not be possible resulting to a CC push if the grid disconnects resulting in a spike. the disconnect might be from settings to tight or as it was said utility spikes. You might thing that the battery bank should take it up but internal resistance in the battery or to it may prevent it. The other thing I would look at is connections, if there is any resistance in a connection this could happen. </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jul 17, 2017 at 2:36 AM, Drake <span dir="ltr"><<a href="mailto:drake.chamberlin@redwoodalliance.org" target="_blank">drake.chamberlin@<wbr>redwoodalliance.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Wrenches,<br>
<br>
My client reported seeing an overvoltage error message on her Mate 3 on a Radian system. The Radian is selling to the grid and is being fed by a Midnite Classic 200. It has shown two spikes so far, the last one going to 67 volts and lasting 1 second. The batteries are Concorde AGM, 305 AH.<br>
<br>
Does this momentary spike seem like a problem or a warning of problems to come?<br>
<br>
Thanks,<br>
<br>
Drake<br>
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