Did SMA give anymore explanation as to why this set up does not work?
On 7/10/2020 10:50 AM, scot.a...@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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