[RE-wrenches] LG Chem RESU10 Storage Capacity

[Jon Siegenthaler]

Hey Wrenches,

I have a site with an LG Chem 9.8kW battery. This is coupled with the
Solaredge Energy Hub. According to the data sheet the battery is listed as
a 9.8kWh battery and has a usable capacity of 9.3kWh.

On the Solaredge portal for the customer I can download the CSV file for
the system production and consumption as well as the battery discharge.
When I add up the kWh on average the battery will feed between 6.6-6.8kWh
at a DOD of 85-84%. The elevation of the installation is 500ft above sea
level, the battery is installed in the laundry room in the house where the
highest temperature is 85°F.

I had spoken to a Solaredge tech about the remaining 15% of the battery and
if the client could use this portion. He had said that 5% was reserved for
the inverter to keep operating and 10% was for the battery to stay
awake/alive. Even with this added 15% as the "reserve" we're seeing nowhere
near the supposed 7.9kWh. We seem to be missing around 1.3kWh of storage.

On another site I have already had one battery internally explode back in
July that wasn't on the recall list and am supposed to get the replacement
in Q1 of 2022. Needless to say I'm less than impressed by LG and their
under performance. Is anyone else experiencing anything similar with the
storage capacity?

Jon
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