[RE-wrenches] Working with SBS 6.0 and LG Chem batteries

[Vic Guillot]

Hey Dave,
Thanks for your input. The issue at stake here is that one or more large
solar supply companies misrepresented the facts on this combination of
inverter gear and battery. They did start the year out with LG Chem being
the first battery on the compatibility list. After months of complaints
they quickly pivoted somewhere around June. I know there are other
installers out there, we hope to hear from them too.
Vic Guillot

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



On Mon, Aug 17, 2020 at 7:10 AM Dave Angelini Offgrid Solar <
offgridsolar at sti.net> wrote:

> As others have said, it is an LG problem. I did the field test here for
> Schneider and LG on the 48vdc battery. I got to look at the 400v resu 10H
> and it was worse than the 48v resu 10. At that time the 10h only worked
> with Solar Edge the Israeli company.
>
> The bad part, to me, was that LG never cared to finish the test here and
> do a failure analysis on what killed their resu 10. The other one still
> works but I cut the charge current way below spec, and use it only with a
> CSW and not the XW it was meant for.
>
> In Australia they use the resu 10 with Victron, but it has had alot of
> issues and never has been listed for offgrid. LG needs to re-engineer the
> whole ESS line. They are NMC based and that too is an issue that LFP has
> solved!
>
> My advice to the problem here, is to get the supplier to put pressure on
> both SMA and LG for a refund or credit. What a nightmare for you!  Good
> Luck!
>
>
>
> *Dave Angelini Offgrid Solar
> "we go where powerlines don't"
> http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
> On Sun, 16 Aug 2020 17:06:49 -0500, scot.arey at solarcentex.com wrote:
>
> I would like to share my experience.
>
>
>
> It does not in any way provide the AC Coupling experience that is
> represented. The LG Chem should never been on any “compatible” list.
> Perhaps they have removed it but it was clearly there (listed in front of
> BYD, even) and we used that representation to install components we have
> trusted in separate designs in two SMA/LG/SMA-Automatic Backup Unit systems.
>
>
>
> Now I have two systems in the field where the AC Coupling is completely
> useless. Because the SMA SBS has no way to continue operations when the LG
> Chem battery switches from discharge to charge and vice versa, it causes
> the SMA to drop off momentarily and that of course takes away the
> conditions under which the AC Coupled PV inverter operates.
>
>
>
> In backup mode (grid off) conditions, it retards the PV inverter output so
> much so that it minimizes the switching I describe above, but once a system
> load is put on, the system momentarily switches off and the SBS re-boot /
> PV inverter reconnect cycle starts again. Not elegant. Not in the least bit
> what we expect from an AC-Coupled design, especially one with an Automatic
> Backup Unit integration that is there for the sole purpose of aggregating
> the combined output of the SBS and PV inverter to provide large backed up
> load capability.
>
>
>
> SMA advises me that I need to put BYD into the two systems. Sure…but I
> bought LG based on what you represented in documentation so I really want
> to see SMA reimburse me for two BYD batteries before I spend money on legal
> help to join a class-action suit regarding the misrepresentation.
>
>
>
> I expect more from SMA.
>
>
>
>
>
>
>
>
>
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