[RE-wrenches] Over voltage error message

[Dave Angelini Offgrid Solar]

I remember beta testing with Schneider in 2006 and the effect was there
but quickly went away with networked charge sources. --Dave


> 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.
>
>
>
>
>
>
> <http://www.rollsbattery.com> <http://www.rollsbattery.com>
> <http://www.rollsbattery.com> <http://www.rollsbattery.com>
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> Steve Higgins
> Technical Services Manager
> m +1.206.790.5840
> f +1.902.597.8447  *e* steve at surrette.com
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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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Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
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