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

[Steve Higgins]

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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