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

[Mark Frye]

Did SMA give anymore explanation as to why this set up does not work?

On 7/10/2020 10:50 AM, scot.arey at solarcentex.com wrote:
>
> We have a design with Sunny Storage 6.0 inverter, SB 6.0 PV inverter,=20
> the SMA Automatic Backup Unit, and three LG Resu batteries. Works like=20
> a charm during normal grid ops but when it goes into backup ops, the=20
> Sunny Storage increases frequency to between 60.6 with blips up to 61=20
> hertz, resulting in the PV inverter throttling back from 5,000+ watts=20
> to between 1,300 to 345 watts.
>
> The result is that the batteries do not recharge from the PV during=20
> backup mode, even when SoC is less than half capacity. This also means=20
> the max power through the ABU to the =E2=80=9Cwhole house backup=E2=80=9D=
 is the 6,000=20
> watts from the Sunny Storage plus the (very) retarded power output of=20
> the SB PV inverter.
>
> SMA tech support just said, =E2=80=9Cthat is normal, the LG Battery is th=
e=20
> culprit and=C2=A0 does not charge from PV in this setup.=E2=80=9D
>
> I was stunned because why else would I buy this ABU coupling=20
> setup=E2=80=A6Anybody have any ideas? I=E2=80=99m hoping the Sunny Storag=
e freq=20
> shifting ramp-up parameters can be adjusted so that PV inverter=20
> operations continue when the battery is at a less than full SoC.
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.o=
rg/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.=
org/attachments/20200710/5d4b9830/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 37150 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.=
org/attachments/20200710/5d4b9830/attachment.png>