[RE-wrenches] Over voltage error message

[Drake]

Hello boB and Steve,

I haven't been able to make it to the site yet, but so far, no more 
reports of spikes. I plan to try boB's suggestion of shutting off the 
grid input while it is selling, to see what happens.

The spike did only last one second, so I don't think it is a chemical 
whip effect. If the spike only lasted a fraction of a second, 
wouldn't the Mate 3 still show the event lasting a second, since that 
is its lowest level of granularity?

The array size is 2240 W and the Concorde battery bank is 305 AH at 
48 V for a  C/6.5 charge rate. The battery bank should have been 
fully charged. If the grid went down and the Radian quit selling 
during a heavy selling period, could that not cause a 1 second 
voltage spike, or should the Classic catch it instantaneously?

Thanks,

Drake

At 11:49 PM 7/18/2017, bob at midnitesolar.com wrote:


>The Classic can overshoot but not very much, normally.
>
>I would try this...
>
>Sell to grid while watching the battery voltage and then turn the 
>inverter breaker off
>
>and see what the battery voltage does.  If the battery voltage rises 
>to the mid 60V range
>
>from a low sell voltage of around 52 or 53V, then something is really amiss.
>
>If the system has been in service for some time, you might also 
>check the capacity of
>
>the batteries.  They should not easily allow 65-ish volts.  I don't 
>think that the
>
>FM's communication can respond  to keep spikes from happening any better
>
>than it could without communications.  Data packets just don't come all that
>
>often.
>
>boB
>
>On 7/18/2017 5:25 PM, Jerry Shafer 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 
>><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at 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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