The assumption here is that the battery was fully charged the previous night. There are a number of variables, that will reveal whether the two systems are configured with the same power management strategy. Noted the consumption patterns for the two properties appear significantly different.
Hybrid inverters typically allow owners to choose between only drawing down on the battery for self consumption, or alternately exporting, or in some even setting time periods for the battery to supply power to the household. It’s not immediately evident from the basic Sungrow manual which options your inverter supports, other than a zero export mode. Some modes of operation may not be permitted by Ergon.
I have a non hybrid SG5K. Even for that basic inverter, not all of the Engineering settings are explained in the manual. Protection against tampering perhaps?
Are both systems connected to the cloud service provided by Sungrow, (isolarcloud or isolarhome)? If so using the PC based access, as distinct from the mobile AP you can or should be able to export a time series for any monitored inverter data series.
As @gordon suggested. It’s difficult for him to offer any feedback without a more complete picture of how the systems have performed. You might need to look at several consecutive days of data. The Sungrow data appears to update every 6 minutes.
I can look back more than 6 months at detailed performance. Or from day one for summary data.