[RE-wrenches] Outback Charge controllers resetting to default settings

[Tyrone Houck]

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 <
re-wrenches at lists.re-wrenches.org> 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
> zeke at darkforestsolar.com
> 303-523-3592
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