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

[Steve Higgins]

Okay... probably something to do with the R firmware.

The only other thing I still see alot is there is a DC genset charging
settings.

This should only be changed if you have a generator that outputs only DC
voltage..

It comes defaulted to 76 ot 78v and alot of installers will set this to
absorb voltage.

Just make sure that it's set to default and not set lower as that will
affect the chargers.   Make sure you check all 4 ports...

*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, 9:57 AM Jason Szumlanski <
jason at floridasolardesigngroup.com> 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
>> ------------------------------
>> CONFIDENTIALITY: The information transmitted herein is intended only for
>> the addressee and may contain confidential, proprietary and/or privileged
>> material. Any unauthorized review, distribution or other use of or the
>> taking of any action in reliance upon this information is prohibited. If
>> you receive this email in error, please contact the sender and delete or
>> destroy this message and all copies.
>> ------------------------------
>>
>>
>>
>> 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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