[RE-wrenches] Outback FXR Slaves Not Charging With AC

Tue Mar 17 03:52:02 PDT 2026

Hey Jason

You may also want to verify that the global charge control settings in the
Mate are disabled.  You can also quickly play with switching ports on the
Hub to see if its device specific issue or set up issue.

Good Luck!

On Mon, Mar 16, 2026 at 1:21 PM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Assuming it’s wired correctly which it sounds like it is . A few thoughts.
> Inverter dc calibration, inverter charge voltage setpoints, and as someone
> said how full are the batteries?
> I can’t think of anything else.
>
> But if all else fails, and regardless of battery % it won’t act correctly
> then I’d do a factory reset annd see if that fixes it. If not then update
> rhw firmware on mate and all inverters. Of course you can try just the mate
> update first which usually has been the most common  fix.
>
> I have seen odd behaviors that could not be explained that firmware
> reinstalled or updated fixed.  I used to travel with all the firmware
> updates on SD cards in my truck.
>
> Out of curiosity are these the new Outback or the old Outback equipment?
>
> Good luck
>
>
>
> On Mar 16, 2026, at 9:23 AM, Jason Szumlanski via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> The manual says to set a subphase master when doing split
> phase with serial/parallel stacking, but I guess it's worth a try!
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
>
> On Mon, Mar 16, 2026 at 11:10 AM Kirk Herander <kirkh at vermont.solar>
> wrote:
>
>> Will the inverter support just 1 master and 3 slave configuration? This
>> might enable all the slaves to charge.
>>
>> On Mon, Mar 16, 2026 at 11:01 AM Jason Szumlanski via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> The FXR manual supports the way it was installed and configured. There
>>> is an L1 master and an L2 "subphase master." Each of the slaves is assigned
>>> to L1 or L2.
>>>
>>> And BTW I do have the input mode set to Generator for all four inverters
>>> (although the slaves take the setting from their masters anyway).
>>>
>>>
>>> Jason
>>>
>>>
>>> On Mon, Mar 16, 2026 at 10:49 AM Steve Higgins <steve at surrette.com>
>>> wrote:
>>>
>>>> Hey Jason... I'll admit it's been awhile since I was with OB.   But
>>>> from what I remember you can only have one Master inverter.
>>>>
>>>> You can't have a master and slave on each leg.
>>>>
>>>> The port one inverter needs to be a 1 -2 phase master.
>>>>
>>>> The other three should be slave L1 or L2 depending on the phase that
>>>> they are connected to.
>>>>
>>>> My bet is the charging isn't syncing due to the master/slave setup.
>>>>
>>>> Right now they aren't backfeeding due to the generator is syncing the
>>>> phases.  I like to call magic stacking.    Eventually when the generator
>>>> isn't running you could see enough drift from that 2nd 1-2 phase master
>>>> that might cause a backfeed or overcurrent error.
>>>>
>>>>
>>>> *Steve Higgins* *⋅* *Technical Services Manager*
>>>> *t* +1.902.597.4020   *m* +1.206.790.5840
>>>> *f* +1.902.597.8447   *e* steve at surrette.com
>>>> ------------------------------
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>>>>
>>>>
>>>> On Mon, Mar 16, 2026, 7:40 AM Jason Szumlanski via RE-wrenches <
>>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>>
>>>>> I inherited am off-grid service client with four FXR3048A configured
>>>>> in 120/240 split phase with one master and one slave per leg. I believe I
>>>>> configured all of the AC input charging parameters correctly, requesting
>>>>> max charge rate from each inverter. However, when AC input is present (from
>>>>> a generator) the masters will bulk charge, but the slaves do not charge at
>>>>> all. The slaves do share the load, but show 0.0kW for charging.
>>>>>
>>>>> Any ideas?
>>>>>
>>>>> Jason Szumlanski
>>>>> Florida Solar Design Group
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>>
>> --
>>
>>
>> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>>
>> *Owner|Principal, VT Solar, LLC*
>>
>> *Celebrating our 35th Anniversary 1991-2026!!*
>>
>> dba Vermont Solar Engineering
>>
>> 802.559.1225
>>
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-- 

Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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