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

[Jason Szumlanski]

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*
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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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