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 <[email protected] <mailto:[email protected]>> 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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