How to Combine Multiple Inverter AC Outputs into One Synchronized Output via Bus Bars

how do i get to combine several AC currents coming from inverters to be synchronized into one single ac output through bus bars?

Hi Farah-The key word here is "synchronized".  All of the inverters will need to be carefully synchronized before this will be possible. Even if they are already synchronized they will need the ability to "load share".  Load sharing is generally implemented by allowing an inverter to deliver current up to its maximum, and when it approaches maximum it will limit current rather than shutting down. The ability to connect the output of multiple inverters together will need to be part of the original design of the inverters, and not a circuit that can be added externally.-Rick

Just as an aside, you could probably do this by having one master standalone inverter and then connect Grid-connect inverters to that output.  The grid-connect inverters will synchronize to the master inverter.  This is the technology used in Solar domestic installations.

Do you know what are the effects on non synchronized inverters connected parallel ?

> Do you know what are the effects on non synchronized inverters connected parallel ? Usually, destruction of some or all of the inverters!