[RE-wrenches] Battery Sensor Light on VFX3648

Fri Jan 9 15:56:22 PST 2026

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 <
re-wrenches at lists.re-wrenches.org> 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 <
> re-wrenches at lists.re-wrenches.org> 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 <
> re-wrenches at lists.re-wrenches.org> 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 <
>> re-wrenches at lists.re-wrenches.org> 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 <
>>> re-wrenches at lists.re-wrenches.org> 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
>>> sgsrenewables at gmail.com
>>>
>>> On Jan 8, 2026, at 3:00 PM, Drake Chamberlin via RE-wrenches <
>>> re-wrenches at lists.re-wrenches.org> 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
> <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: chris at solarandwindfx.com
> <chris at solarandwindfx.com>*
>
>
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