$username = ".\Administrator"
$password = "P@ssw0rd!"
$securePassword = ConvertTo-SecureString $password -AsPlainText -Force
$cred = [PSCredential]::new($username, $securePassword)
# または
#$cred = Get-Credential

$vmNames = @("node01","node02")

$vms = Get-VM -Name $vmNames -ErrorAction Stop
Invoke-Command -VMName $vms[0].Name -Credential $cred -ScriptBlock { 
    Stop-Cluster -Force
}
$vms | Stop-VM -Force
do {
    Start-Sleep -Seconds 1
} until (($vms.State | Select-Object -Unique) -ne "Off")
Write-Host "All nodes are Off."