I have an ESS system connected to the grid (2 out of 3 phases). So I have 2 Multiplus inverter and 1 battery box. Now it’s evening, the MPPT is off. The battery is feeding the loads. But for some reason it feeds also phase 1 while the phase 2 feeds the loads with same power. You can see it on the picture. I would be expecting the grid would be off as battery can feed both phases. Any idea why is that? Maybe I set up something wrong by installing the new battery box? 
Take a look at the ESS manual:
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