[RE-wrenches] Over voltage error message

[Steve Higgins]

Wrenches...

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.

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.

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.






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On Tue, Jul 18, 2017 at 5:25 PM, Jerry Shafer <jerrysgarage01 at gmail.com>
wrote:

> Wrenches
> 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.
>
> On Mon, Jul 17, 2017 at 2:36 AM, Drake <drake.chamberlin@
> redwoodalliance.org> wrote:
>
>> Hello Wrenches,
>>
>> 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.
>>
>> Does this momentary spike seem like a problem or a warning of problems to
>> come?
>>
>> Thanks,
>>
>> Drake
>>
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