How inefficient can PSUs be?
According to my Kill-A-Watt, my system usually pulls 45-55W when I am using it. The other day, I tried to max it out with an unrealistic situation where I was recording 3 channels, "watching" a DVD, while also streaming HD video from a website. During that situation, I was pulling 75-82W at the wall.
I was thinking of getting a picoPSU 80 with a 60W ac adapter. Do you think that will be sufficient? I figure that even in the 75W load situation, my PSU is only 70% efficient at best, meaning 53W load. This would require the PicoPSU to be about 88% efficient (if I ever wanted to run that stupid situation), which is right on the boundaries of its abilities from what I read. However, is that 70% estimate even remotely accurate? I've tried to do research on how inefficient PSUs can be but have turned up nothing. This is the PSU. Do you think my PSU's under 70% efficient? Over? Do you agree the 60W adapter would be enough?
Thanks for any insight!