Can I consider adding a small 2 KVA single phase ESS ( 1 KW PV) to ACout 2 of a large 15 KVA 3 Phase ESS system( 11 KWp PV) . Doing this can potentially allow me to add some critical loads to AC OuT 2 but still maintain loading capacity of a 15 KVA ( limited right now by the size of battery 10 KWH BYD pro)
The 2 KVA single phase will run its own 10 KWH lithium battery ( from a different manufacturer)
Or is it better to just run the system in Ignore AC mode and forgo the efficiency gains as the 1 KWp panels will supply a peak 250 Watt load