$vCenters = (Get-Content "C:\VC.txt")

$report = foreach ($vCenter in $vCenters) {

    Connect-VIServer $vCenter -Protocol https -Credential $Creds | Out-Null

    Get-Cluster -Server $vCenter -PipelineVariable cluster |

    ForEach-Object -Process {

        Get-Datastore -RelatedObject $cluster |

        where{$_.FreeSpaceGB -gt 8GB -and $_.DatastoreBrowserPath -notcontains "*local-storage-1"} |

        Select @{N='vCenter';E={$vCenter}},

            @{N='Cluster';E={$Cluster.Name}},

            @{N='Datacenter';E={$_.Datacenter.Name}},

            @{N='Datastore Browser Path';E={$_.DatastoreBrowserPath}},

            @{N='Datastore Name';E={$_.Name}},

            @{N='Datastore Capacity';E={$_.CapacityGB}},

            @{N='Datastore Free Space';E={$_.FreeSpaceGB}}

    }

}

$report |  Export-Csv -Path .\Output.csv -Append -NoTypeInformation -UseCulture