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

[scot.arey at solarcentex.com]

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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