Re: output variables to excel spreadsheet.

That's most probably because you have more than 1 WWN, and hence the $out variable will be an array.

Try changing this

$out = get-vmhost $esxihost | get-vmhosthba | get-scsilun | get-scsilunpath | Select -ExpandProperty SanID -unique -ErrorAction "SilentlyContinue"

into this

$out = get-vmhost $esxihost | get-vmhosthba | get-scsilun | get-scsilunpath | Select -ExpandProperty SanID -unique -ErrorAction "SilentlyContinue"

$out = [string]::Join(',',$out)

That way out will be a [string] and not an array.