[RE-wrenches] AC Backfeed from Radian.

[Jerry Shafer]

If you disconnect the leads to the Benny from at the inverter do you still
have this condition. I had a battery charged supply (ac) in the same
conduit as the remote start and the transient voltage would be enough to
signal z start up. Your issue is a little different but it might still be
transient
Jerry
On Feb 16, 2014 7:02 PM, "john" <cvsolar at aol.com> wrote:

> Wrenches,
>     I have an off-grid installation with an Outback Radian using a Kohler
> RES 13 for backup.  The generator has had problems from day one and has had
> control boards replaced and other work done on it.  This system started out
> with a Magnum 4024AE but was undersized for the loads and battery size so
> we upgraded to the Radian.  The current problem is the generator running
> erratically (frequency and voltage) and running rough.  The Kohler
> repairman said that the problem is that the inverter had damaged the
> generator with a measured 12 VAC at the inverter side of the AC IN breaker
> when the generator is off.  When I arrived, we started the generator with
> the MATE 3 and it worked fine for about 10 minutes charging at 4.5 kw and
> then the engine started running erratically.  The frequency readout on the
> MATE 3 ranged from 56 Hz to 67 Hz and the voltage was sometimes steady at
> 238 and at times varying from 236 to 244.  The MATE 3 showed several manual
> starts previously where the Initial voltage was 277 briefly (1 second) and
> then leveled out and locked on. Eventually the generator shut down with
> Error 13.  We also had it fail to start with Locked Rotor error.  I did
> measure 3.1 VAC on the AC out bus of the inverter when the generator was
> stopped.  Is that small voltage present normal for the Radian and is there
> any way that could affect the generator?   When I set the MATE 3 to DROP to
> disconnect the charging, we could still read the hz and Voltage at the bus
> and the erratic behavior continued.  I think there are serious problems
> with the generator but the Kohler tech says it is the inverter interference
> .  When we started the generator manually with the input breaker off, it
> ran erratic and eventually shut down.
>
>  The customer wants the generator guy and myself there tomorrow to figure
> out how to fix it.   I say a new generator might take care of the problem
> but the customer doesn't want to hear this.
> Any ideas?  I have dealt with lots of generators and to me this seems like
> a worn out genny.
>
>  John Blittersdorf
> Central Vermont Solar & Wind
>
>
>
>
>
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