What is the maximum number of energy storage devices connectable to the Schuko sockets of the Zendure PowerHub 1P, and what specifications are required?

What is the maximum number of energy storage devices connectable to the Schuko sockets of the Zendure PowerHub 1P, and what specifications are required?

Up to 3 sets of energy storage devices can be connected, compatible with models such as 4000 Mix/AC+ and SF2400 Pro with grid-tie power ≤3680W.