[RE-wrenches] SMA Sunny Storage AC-coupled with SB6.0 won't recharge LG Resu batteries during backup ops

[Vic Guillot]

Dear Wrenches,
We too are having issues with sma sunnyboy storage sbs6.0
I would like to discuss with anyone off line.
Vic Guillot
solsierra1 at gmail.com

Vic Guillot
Sol Sierra, Inc.
209.795.3554 office
209.768.3560 mobile/text



On Fri, Jul 10, 2020 at 11:56 AM <scot.arey at solarcentex.com> wrote:

> We have a design with Sunny Storage 6.0 inverter, SB 6.0 PV inverter, the
> SMA Automatic Backup Unit, and three LG Resu batteries. Works like a charm
> during normal grid ops but when it goes into backup ops, the Sunny Storage
> increases frequency to between 60.6 with blips up to 61 hertz, resulting in
> the PV inverter throttling back from 5,000+ watts to between 1,300 to 345
> watts.
>
>
>
> The result is that the batteries do not recharge from the PV during backup
> mode, even when SoC is less than half capacity. This also means the max
> power through the ABU to the “whole house backup” is the 6,000 watts from
> the Sunny Storage plus the (very) retarded power output of the SB PV
> inverter.
>
>
>
> SMA tech support just said, “that is normal, the LG Battery is the culprit
> and  does not charge from PV in this setup.”
>
>
>
> I was stunned because why else would I buy this ABU coupling setup…Anybody
> have any ideas? I’m hoping the Sunny Storage freq shifting ramp-up
> parameters can be adjusted so that PV inverter operations continue when the
> battery is at a less than full SoC.
>
>
>
>
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