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Today's Topics:
1. Outback Charge controllers resetting to default settings
(Zeke Yewdall)
2. Re: Outback Charge controllers resetting to default settings
(Tyrone Houck)
3. Re: Battery Sensor Light on VFX3648 (Chris Schaefer)
4. Re: Battery Sensor Light on VFX3648 (jay)
5. Re: Battery Sensor Light on VFX3648 (Jerry Shafer)
6. Re: Battery Sensor Light on VFX3648 (jay)
7. Re: Outback Charge controllers resetting to default settings
(Nick Lucchese)
----------------------------------------------------------------------
Message: 1
Date: Fri, 9 Jan 2026 14:56:47 -0800
From: Zeke Yewdall <[email protected]>
To: RE-wrenches <[email protected]>
Subject: [RE-wrenches] Outback Charge controllers resetting to default
settings
Message-ID:
<canc8fmr7gbe-bx_+6opojutcsf5qs3c1anenxvuzs+-iltp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Has anyone else had issues with outback charge controllers resetting
to
default settings? I just had a FM100 do this (and shut the whole
system
down because the default settings were too high of voltage for a 15
cell
LFP, so the battery turned itself off for protection). The logs show
that
the values were set to 0 from the proper settings, then to the default
settings from 0, on site. But no one was on site. I changed them
back
remotely via opticsRE, and it logged me as changing them back, as it
should
have.
Occasionally in the past I've had similar things happen, and always
kind of
chalked it up to the customer perhaps messing with the system, but
this
time I know that no one was there to adjust it locally at the time
that it
says it was changed.
I have another site this week that does not have opticsRE, that the
FM100
may have reset to default settings as well. Same thing -- lithium
batteries shutting off from overvoltage all of a sudden. I am still
investigating that one.
Zeke
--
Zeke Yewdall
PV Engineer
NABCEP #031508-89
[email protected]
303-523-3592
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Message: 2
Date: Fri, 9 Jan 2026 15:08:24 -0800
From: Tyrone Houck <[email protected]>
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Outback Charge controllers resetting to
default settings
Message-ID:
<CAEqH54=dnxm-buzrijftd+zpnmkpe_haqy_7539ryxwcfdp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I have had that happen before on at least 3 different occasions.
Specifically with the fm100. Totally random and couldn't come up with
a
logical explanation. I just reprogram and roll with it...always seemed
odd
though.
On Fri, Jan 9, 2026, 2:58?PM Zeke Yewdall via RE-wrenches <
[email protected]> wrote:
Has anyone else had issues with outback charge controllers resetting
to
default settings? I just had a FM100 do this (and shut the whole
system
down because the default settings were too high of voltage for a 15
cell
LFP, so the battery turned itself off for protection). The logs show
that
the values were set to 0 from the proper settings, then to the
default
settings from 0, on site. But no one was on site. I changed them
back
remotely via opticsRE, and it logged me as changing them back, as it
should
have.
Occasionally in the past I've had similar things happen, and always
kind
of chalked it up to the customer perhaps messing with the system, but
this
time I know that no one was there to adjust it locally at the time
that it
says it was changed.
I have another site this week that does not have opticsRE, that the
FM100
may have reset to default settings as well. Same thing -- lithium
batteries shutting off from overvoltage all of a sudden. I am still
investigating that one.
Zeke
--
Zeke Yewdall
PV Engineer
NABCEP #031508-89
[email protected]
303-523-3592
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------------------------------
Message: 3
Date: Fri, 9 Jan 2026 18:35:43 -0500
From: Chris Schaefer <[email protected]>
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Battery Sensor Light on VFX3648
Message-ID:
<cafovl0bmr2xwoiwvw9ayshtd8pxehpc6rmm5lhygaxd0lzb...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
While on the subject of VFX inverters in regards to the fan and
internal
temp sensors, I've got a client with a circa 2010 VFX3624 that appears
to
have a failed fan. I don't normally deal with 24 volt inverters. I've
got
many dead VFX3648 units hanging out. My question is can I cannibalize
a fan
out of a 48 volt unit and put it in a 24 volt unit? Next, let's say
the fan
is ok and based on the readings above I should look into replacing the
xfmr
temp sensor. Again, can I take one out of a 48v inverter and use it on
a
24v unit? Which board might be suspect as well that the xfmr temp
sensor
feeds its information too?
Thanks,
Christopher
On Thu, Jan 8, 2026 at 9:23?PM Jerry Shafer via RE-wrenches <
[email protected]> wrote:
Wrenches, Jay,
Transformer temp sensors in the FX Fails, fans fail causing fet
boards to
overheat, dirty filters cause high temps on all the intervals. When
outback
was still running the parts department you always got temp senders
with
fans, boards and a relocation procedure, yes you must put the sensor
in a
new location.
FunTimes
On Thu, Jan 8, 2026, 3:26?PM Jay via RE-wrenches <
[email protected]> wrote:
I?ve replaced dozens of internal temp sensors over the years.
I learned to also replace the fan at the same time.
Or vice versa.
Jay
On Jan 8, 2026, at 4:01?PM, Luke Christy via RE-wrenches <
[email protected]> wrote:
?Drake,
I agree with Ray,
The message you?re seeing does not refer to the RTS that has been
absent
for years- it?s an issue with an internal sensor.
I have seen intermittent warnings relating to internal sensors on
VFX
units that have self-resolved with a reboot, but if the warning is
persistent then you?ll likely need to open the unit up and replace
the
sensor.
Luke Christy
Renewable energy consultant
NABCEP Certified PV Installation Professional?:
Solar Gain Services, LLC
PO Box 531
Monte Vista, CO 81144
719.588.3044
[email protected]
On Jan 8, 2026, at 3:00?PM, Drake Chamberlin via RE-wrenches <
[email protected]> wrote:
A couple of years back, a client changed from lead acid batteries to
LiFeBlue, lithium batteries. At that time the temperature sensor was
removed.
The other day, a warning light started blinking. The warning turned
out
to be a bad temperature sensor. It is strange that this message
showed up
now, as the sensor has been gone for years.
Is there any way to turn off the warning light?
Thank you,
Drake
*Drake Chamberlin*
*Athens Electric LLC*
*Ohio Electrical Contractor?s License 44810*
*NABCEP Certified PV Installation Professional*
--
_______________________________________________
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--
Chris Schaefer?s
*Tel 585-229-2083 or Cell 585-748-1870 *
*5115 S Hill Road ~ Canandaigua New York 14424**www.solarandwindfx.com
<http://www.solarandwindfx.com> ~ E-mail: [email protected]
<[email protected]>*
Thomas Jefferson, the author of our great Constitution, once said,
"democracy" will cease to exist when you take away from those who are
willing to work and give to those who would not."
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------------------------------
Message: 4
Date: Fri, 9 Jan 2026 16:51:02 -0700
From: jay <[email protected]>
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Battery Sensor Light on VFX3648
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
HI Chris,
They are all 12v fans and universal between 12,24,48v units
jay
On Jan 9, 2026, at 4:35?PM, Chris Schaefer via RE-wrenches
<[email protected]> wrote:
While on the subject of VFX inverters in regards to the fan and
internal temp sensors, I've got a client with a circa 2010 VFX3624
that appears to have a failed fan. I don't normally deal with 24 volt
inverters. I've got many dead VFX3648 units hanging out. My question
is can I cannibalize a fan out of a 48 volt unit and put it in a 24
volt unit? Next, let's say the fan is ok and based on the readings
above I should look into replacing the xfmr temp sensor. Again, can I
take one out of a 48v inverter and use it on a 24v unit? Which board
might be suspect as well that the xfmr temp sensor feeds its
information too?
Thanks,
Christopher
On Thu, Jan 8, 2026 at 9:23?PM Jerry Shafer via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
Wrenches, Jay,
Transformer temp sensors in the FX Fails, fans fail causing fet
boards to overheat, dirty filters cause high temps on all the
intervals. When outback was still running the parts department you
always got temp senders with fans, boards and a relocation
procedure, yes you must put the sensor in a new location.
FunTimes
On Thu, Jan 8, 2026, 3:26?PM Jay via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
I?ve replaced dozens of internal temp sensors over the years.
I learned to also replace the fan at the same time.
Or vice versa.
Jay
On Jan 8, 2026, at 4:01?PM, Luke Christy via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
?Drake,
I agree with Ray,
The message you?re seeing does not refer to the RTS that has been
absent for years- it?s an issue with an internal sensor.
I have seen intermittent warnings relating to internal sensors on
VFX units that have self-resolved with a reboot, but if the
warning is persistent then you?ll likely need to open the unit up
and replace the sensor.
Luke Christy
Renewable energy consultant
NABCEP Certified PV Installation Professional?:
Solar Gain Services, LLC
PO Box 531
Monte Vista, CO 81144
719.588.3044
[email protected] <mailto:[email protected]>
On Jan 8, 2026, at 3:00?PM, Drake Chamberlin via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
A couple of years back, a client changed from lead acid batteries
to LiFeBlue, lithium batteries. At that time the temperature
sensor was removed.
The other day, a warning light started blinking. The warning
turned out to be a bad temperature sensor. It is strange that
this message showed up now, as the sensor has been gone for
years.
Is there any way to turn off the warning light?
Thank you,
Drake
Drake Chamberlin
Athens Electric LLC
Ohio Electrical Contractor?s License 44810
NABCEP Certified PV Installation Professional
--
_______________________________________________
List sponsored by Redwood Alliance
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List sponsored by Redwood Alliance
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--
Chris Schaefer?s
Tel 585-229-2083 or Cell 585-748-1870
5115 S Hill Road ~ Canandaigua New York 14424
www.solarandwindfx.com <http://www.solarandwindfx.com/> ~ E-mail:
[email protected] <mailto:[email protected]>
Thomas Jefferson, the author of our great Constitution, once said,
"democracy" will cease to exist when you take away from those who are
willing to work and give to those who would not."
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: http://re-wrenches.org
List Address: [email protected]
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------------------------------
Message: 5
Date: Fri, 9 Jan 2026 15:56:22 -0800
From: Jerry Shafer <[email protected]>
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Battery Sensor Light on VFX3648
Message-ID:
<CAMUFgmUx+5u1YRnzJY1p1HWrX0djdHwEZY+=bjlquemqohp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Wrenches. Jay
As l recall all the fans are the same PN same with the sensors. Just
relocate the temp sender to the new location as l recall it is on top
of
the xfmr.
Fun times
On Fri, Jan 9, 2026, 3:52?PM jay via RE-wrenches <
[email protected]> wrote:
HI Chris,
They are all 12v fans and universal between 12,24,48v units
jay
On Jan 9, 2026, at 4:35?PM, Chris Schaefer via RE-wrenches <
[email protected]> wrote:
While on the subject of VFX inverters in regards to the fan and
internal
temp sensors, I've got a client with a circa 2010 VFX3624 that
appears to
have a failed fan. I don't normally deal with 24 volt inverters. I've
got
many dead VFX3648 units hanging out. My question is can I cannibalize
a fan
out of a 48 volt unit and put it in a 24 volt unit? Next, let's say
the fan
is ok and based on the readings above I should look into replacing
the xfmr
temp sensor. Again, can I take one out of a 48v inverter and use it
on a
24v unit? Which board might be suspect as well that the xfmr temp
sensor
feeds its information too?
Thanks,
Christopher
On Thu, Jan 8, 2026 at 9:23?PM Jerry Shafer via RE-wrenches <
[email protected]> wrote:
Wrenches, Jay,
Transformer temp sensors in the FX Fails, fans fail causing fet
boards to
overheat, dirty filters cause high temps on all the intervals. When
outback
was still running the parts department you always got temp senders
with
fans, boards and a relocation procedure, yes you must put the sensor
in a
new location.
FunTimes
On Thu, Jan 8, 2026, 3:26?PM Jay via RE-wrenches <
[email protected]> wrote:
I?ve replaced dozens of internal temp sensors over the years.
I learned to also replace the fan at the same time.
Or vice versa.
Jay
On Jan 8, 2026, at 4:01?PM, Luke Christy via RE-wrenches <
[email protected]> wrote:
?Drake,
I agree with Ray,
The message you?re seeing does not refer to the RTS that has been
absent
for years- it?s an issue with an internal sensor.
I have seen intermittent warnings relating to internal sensors on
VFX
units that have self-resolved with a reboot, but if the warning is
persistent then you?ll likely need to open the unit up and replace
the
sensor.
Luke Christy
Renewable energy consultant
NABCEP Certified PV Installation Professional?:
Solar Gain Services, LLC
PO Box 531
Monte Vista, CO 81144
719.588.3044
[email protected]
On Jan 8, 2026, at 3:00?PM, Drake Chamberlin via RE-wrenches <
[email protected]> wrote:
A couple of years back, a client changed from lead acid batteries
to
LiFeBlue, lithium batteries. At that time the temperature sensor
was
removed.
The other day, a warning light started blinking. The warning turned
out
to be a bad temperature sensor. It is strange that this message
showed up
now, as the sensor has been gone for years.
Is there any way to turn off the warning light?
Thank you,
Drake
*Drake Chamberlin*
*Athens Electric LLC*
*Ohio Electrical Contractor?s License 44810*
*NABCEP Certified PV Installation Professional*
--
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: http://re-wrenches.org
List Address: [email protected]
Change listserver email address & settings:
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--
Chris Schaefer?s
*Tel 585-229-2083 or Cell 585-748-1870 *
*5115 S Hill Road ~ Canandaigua New York 14424
<https://www.google.com/maps/search/5115%0D%0AS+Hill+Road+~+Canandaigua+New+York+14424?entry=gmail&source=g>**www.solarandwindfx.com
<http://www.solarandwindfx.com/> ~ E-mail: [email protected]
<[email protected]>*
Thomas Jefferson, the author of our great Constitution, once said,
"democracy" will cease to exist when you take away from those who are
willing to work and give to those who would not."
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: http://re-wrenches.org
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Message: 6
Date: Fri, 9 Jan 2026 17:06:33 -0700
From: jay <[email protected]>
To: Jerry Shafer <[email protected]>
Cc: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Battery Sensor Light on VFX3648
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
It?s been a lot of years since replaced one, but from memory, the
early FX had the temp sensor plugged into the board.
Later models, I don?t know when it started had the temp sensor
attached to the transformer with tape but it still attaches to the
same plug on the board.
The replacement temp sensors attach to the transformer and include the
high temp tape to attach to the transformer.
it takes all of about 2 minutes to do, once you have the top taken off
the inverter.
Since the cost of the site visit and time to remove the inverter to
replace the $20 temp sensor is high, i also replace the fan as its
also inexpensive but the service call is expensive for the client
I presume that Zonna has the temp sensors and maybe fans again.
Jay
On Jan 9, 2026, at 4:56?PM, Jerry Shafer <[email protected]>
wrote:
Wrenches. Jay
As l recall all the fans are the same PN same with the sensors. Just
relocate the temp sender to the new location as l recall it is on top
of the xfmr.
Fun times
On Fri, Jan 9, 2026, 3:52?PM jay via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
HI Chris,
They are all 12v fans and universal between 12,24,48v units
jay
On Jan 9, 2026, at 4:35?PM, Chris Schaefer via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
While on the subject of VFX inverters in regards to the fan and
internal temp sensors, I've got a client with a circa 2010 VFX3624
that appears to have a failed fan. I don't normally deal with 24
volt inverters. I've got many dead VFX3648 units hanging out. My
question is can I cannibalize a fan out of a 48 volt unit and put
it in a 24 volt unit? Next, let's say the fan is ok and based on
the readings above I should look into replacing the xfmr temp
sensor. Again, can I take one out of a 48v inverter and use it on a
24v unit? Which board might be suspect as well that the xfmr temp
sensor feeds its information too?
Thanks,
Christopher
On Thu, Jan 8, 2026 at 9:23?PM Jerry Shafer via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
Wrenches, Jay,
Transformer temp sensors in the FX Fails, fans fail causing fet
boards to overheat, dirty filters cause high temps on all the
intervals. When outback was still running the parts department you
always got temp senders with fans, boards and a relocation
procedure, yes you must put the sensor in a new location.
FunTimes
On Thu, Jan 8, 2026, 3:26?PM Jay via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
I?ve replaced dozens of internal temp sensors over the years.
I learned to also replace the fan at the same time.
Or vice versa.
Jay
On Jan 8, 2026, at 4:01?PM, Luke Christy via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
?Drake,
I agree with Ray,
The message you?re seeing does not refer to the RTS that has
been absent for years- it?s an issue with an internal sensor.
I have seen intermittent warnings relating to internal sensors
on VFX units that have self-resolved with a reboot, but if the
warning is persistent then you?ll likely need to open the unit
up and replace the sensor.
Luke Christy
Renewable energy consultant
NABCEP Certified PV Installation Professional?:
Solar Gain Services, LLC
PO Box 531
Monte Vista, CO 81144
719.588.3044
[email protected] <mailto:[email protected]>
On Jan 8, 2026, at 3:00?PM, Drake Chamberlin via RE-wrenches
<[email protected]
<mailto:[email protected]>> wrote:
A couple of years back, a client changed from lead acid
batteries to LiFeBlue, lithium batteries. At that time the
temperature sensor was removed.
The other day, a warning light started blinking. The warning
turned out to be a bad temperature sensor. It is strange that
this message showed up now, as the sensor has been gone for
years.
Is there any way to turn off the warning light?
Thank you,
Drake
Drake Chamberlin
Athens Electric LLC
Ohio Electrical Contractor?s License 44810
NABCEP Certified PV Installation Professional
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[email protected] <mailto:[email protected]>
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are willing to work and give to those who would not."
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Message: 7
Date: Sat, 10 Jan 2026 11:17:41 -0800
From: Nick Lucchese <[email protected]>
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Outback Charge controllers resetting to
default settings
Message-ID:
<caawru5id54e+f4rjr3gtpokdu22lxeqrqqp5f-hr7_dthqw...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Yes, it keeps happening to me as well. At least 8 times now. The first
couple times I blamed myself and thought I had made the rookie default
settings mistake I see on other's sites but now I know better. Only
the
FM100. Just got back from a site that resulted in the client's Radian
shutting down due to battery volt sense faults from it. First time it
has
caused shutdowns though. Looks like her Blue Ions had been sitting at
57.6
for months now. Unfortunately she has Hughesnet that almost never
works
with Opticsre otherwise I would have caught it. Extremely frustrating,
I've
easily eaten enough service calls and equipment failures for Outback
over
the years that I could have paid off a Toyota Yaris. No exaggeration.
Nick
On Fri, Jan 9, 2026 at 2:58?PM Zeke Yewdall via RE-wrenches <
[email protected]> wrote:
Has anyone else had issues with outback charge controllers resetting
to
default settings? I just had a FM100 do this (and shut the whole
system
down because the default settings were too high of voltage for a 15
cell
LFP, so the battery turned itself off for protection). The logs show
that
the values were set to 0 from the proper settings, then to the
default
settings from 0, on site. But no one was on site. I changed them
back
remotely via opticsRE, and it logged me as changing them back, as it
should
have.
Occasionally in the past I've had similar things happen, and always
kind
of chalked it up to the customer perhaps messing with the system, but
this
time I know that no one was there to adjust it locally at the time
that it
says it was changed.
I have another site this week that does not have opticsRE, that the
FM100
may have reset to default settings as well. Same thing -- lithium
batteries shutting off from overvoltage all of a sudden. I am still
investigating that one.
Zeke
--
Zeke Yewdall
PV Engineer
NABCEP #031508-89
[email protected]
303-523-3592
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End of RE-wrenches Digest, Vol 19, Issue 10
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