[RE-wrenches] Over voltage error message

[Matthew Sirum]

Greetings Drake,

This is interesting.  I have Grid-tied OutBack Radian GS8048A with
MidNite Classic 200 systems in the field, but don't believe I've seen
this issue before.  (But certainly have seen many strange MATE3 &
OpticsRE issues)

Here are a few questions that come to mind:

What is the Radian "Sell" voltage set at?  Has this setting been
checked since this issue was reported?  Have the Classic 200 settings
been checked to make sure they are set where they should be?

Does the system have any data monitoring on the charge controller
and/or battery system independent of the Radian inverter?  If so, any
information similar to the Events logged on the MATE3?

Does this system have the OutBack FLEXnet DC installed?  There could
be more data to review to try and get a sense of what the issue may
be.  (shunt data, historical VDC data, any battery charging via grid?)

If the system has more than one Classic 200 are they connected and set
up in "Follow Me" mode?

Any chance the charge controller or inverter/charger tried to initiate
an equalization charge?

Does the system have any DC loads or generation sources (other than
the charge controller and inverter/charger) connected directly to the
battery system or anywhere on the DC bus?

Best regards,

----MATT

Matthew Sirum
P.O. Box 1227
Greenfield, MA 01302-1227  USA
phone: +1.413.773.0611
email: MatthewSirum at gmail.com


----------  Original Message Below  ----------

[RE-wrenches] Over voltage error message
Drake drake.chamberlin at redwoodalliance.org
Mon Jul 17 05:36:46 PDT 2017

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