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Hello boB and Steve,<br><br>
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. <br><br>
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? <br><br>
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? <br><br>
Thanks,<br><br>
Drake <br><br>
At 11:49 PM 7/18/2017, bob@midnitesolar.com wrote:<br><br>
<br>
<blockquote type=cite class=cite cite="">The Classic can overshoot but
not very much, normally.<br><br>
I would try this...<br><br>
Sell to grid while watching the battery voltage and then turn the
inverter breaker off<br><br>
and see what the battery voltage does. If the battery voltage rises
to the mid 60V range<br><br>
from a low sell voltage of around 52 or 53V, then something is really
amiss.<br><br>
If the system has been in service for some time, you might also check the
capacity of<br><br>
the batteries. They should not easily allow 65-ish volts. I
don't think that the<br><br>
FM's communication can respond to keep spikes from happening any
better<br><br>
than it could without communications. Data packets just don't come
all that<br><br>
often.<br><br>
boB<br><br>
On 7/18/2017 5:25 PM, Jerry Shafer wrote:<br>
<blockquote type=cite class=cite cite="">Wrenches <br>
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. <br><br>
On Mon, Jul 17, 2017 at 2:36 AM, Drake
<<a href="mailto:drake.chamberlin@redwoodalliance.org">
drake.chamberlin@redwoodalliance.org</a>> wrote:<br>
<dl>
<dd>Hello Wrenches,<br><br>
<dd>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>
<dd>Does this momentary spike seem like a problem or a warning of
problems to come?<br><br>
<dd>Thanks,<br><br>
<dd>Drake<br><br>
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