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It is a 4 wire system. 3,phases + neutral. each phase with 110v. The fridge is 220v (2 phase)

Ok. Got it. Is there any way to instal 3 different cheap inverter and then synchronize them in some way? My concern is if I change the devices later between the phases.

Thank you!

The 3 phases, 127v each is the standard configuration here in south Brazil, for big house. This is why I am trying to figure out some cheap solution without the need to rearrange the devices. Is there an affordable (~$200) 3 phase inverter at max 4kw? No need to be hibrid with solar panel...

One idea that comes into my mind is to put an Variable Frequency Device (VDF) single to 3 phase used for motors to connect in my grid. Would this work?

Hi I am willing to build a very cheap battery backup system for my home, only for blackouts. What is the cheapest way to do that? Is it possible to connect 3 cheap inverter for each phase in a lead acid battery bank? Or is there any cheap option for a 3 phase inverter? My critical devices...

The power amount should not exceed 500w (peak of 1000). The capacity of the system should be around 5.000kwh The average price of a deep cycle battery that I can source locally here is around $100 for 12v 100a

No. Max 2 phases Ex: 1 phase: tv + wifi 2 phase: fridge (phase 1 with phase 2) 3 phase: lights