[RE-wrenches] Over voltage error message

drake.chamberlin at redwoodalliance.org drake.chamberlin at redwoodalliance.org
Tue Jul 18 16:02:09 PDT 2017


Hi Jay,

I suspect that you are on something. The grid in that area has a lot
of hick ups. The grid could have gone down momentarily while the
batteries were selling and the CC was cranking. That would have the
same  effect as turning off a large load. 

Thanks,

Drake 

----- Original Message -----
From: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
To:"RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Cc:
Sent:Mon, 17 Jul 2017 18:03:49 -0700
Subject:Re: [RE-wrenches] Over voltage error message

 HI Drake,

We need some more info to be able to piece this together.

The way I’ve seen this happen with off grid is the batteries are
pretty full, in absorb mode often with aging batteries, and a good
sized load is turned off.  The CC has been putting in extra watts to
keep the batteries at its absorb voltage, the load is suddenly off,
and it can’t react fast enough causing a short voltage spike ( I
call it a bounce).  

If the batteries are pretty low SOC, this won’t happen.
If the ratio of PV to battery is too low, again hard to make it
happen.
But if the ratio of PV to battery is pretty high as in most grid
systems its more common.
I can’t see how it would happen if the system was selling, don’t
know what mechanism would create the spike.

Depending on when in the day and how the system is set up, it next to
impossible to have this spike in sell mode.  So I’d guess it was
during morning battery fill up before sell mode and the client has a
backed up loads panel connected to it?

jay

peltz power

On Jul 17, 2017, at 8:19 AM, Drake
<drake.chamberlin at redwoodalliance.org [1]> wrote:

 Hi Dan and Dave,

 The system did not crash. 

 I think it must be a combination of the Midnite and Radian. The
Radian should sell to keep the voltage down and the Midnite should
regulate. It seems a bit mysterious to me. 

 Thanks,

 Drake 

 At 09:49 AM 7/17/2017, you wrote:
I seem to recall older FX series spitting out this error following a
short on the AC side. Did the system crash?

 db

 Dan Brown
 Foxfire Energy Corp.
 Renewable Energy Systems
 (802)-483-2564
www.Foxfire-Energy.com [2]
 NABCEP #092907-44

 

Links:
------
[1] mailto:drake.chamberlin at redwoodalliance.org
[2] http://www.foxfire-energy.com/

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