You'll have to be more specific as to your goals as there are many ways to go about this.
My apologies if my post was not very clear. Let me reinstate the requirement :
Actually, I would like all my development VMs ( around 200 in no's running in one development cluster ) to be powered down on Friday night and then get powered up on next Monday morning and this should be done in some automated way. Also do we have any limitations on max number of concurrent VM powered on in a single cluster. I could not find this information on vCenter config maximums.
Many thanks in advance.