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

[Dave Angelini Offgrid Solar]

Hi Howard, 

I am sure that the SMA guy here on wrenches will give you a
better answer. If not I would escalate this at SMA as you are right. 

The
LG will do what you want. Something is not programmed correctly. Three of
the Resu 10H are going to take some time to replace near 30KWH.  

Dave
Angelini Offgrid Solar
"we go where powerlines
don't"
http://members.sti.net/offgridsolar/ [1]
e-mail offgridsolar at sti.net
[2]
text 209 813 0060

On Fri, 10 Jul 2020 12:50:04 -0500,
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. 

  


Links:
------
[1] http://members.sti.net/offgridsolar/
[2]
mailto:offgridsolar at sti.net
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