I was wondering how much Air 2018 consume power when it is turned off. I found this Apple document (at the end of the document is listed power consumption in different modes)
https://www.apple.com/environment/pdf/products/notebooks/13-inch_MacBookAir_w_Retina_PER_oct2018.pdf
Based on that it consume 0.05W power off. I'm not sure if that is calculated with power supply connected which is efficiency around 90% as which consume 0.02 - 0.01W depending on main voltage.
Anyway if I understood correctly power off consumption should one around 0.05W - 0.028W, so it should draw daily 1.2 - 0.67W. If battery is 50W and it is full from the factory it should last about 42 to 75 days from 100 to 0%.
Any ideas what am I counting wrong?
There must be some error because for example in another thread other member here said his Air 2018 had about 70% battery out of the box and his Air was manufactured about one month ago, so based on that this my math does not match because it is unlikely they even charge battery to 100% at the factory (or do they?).
But if they do charge them to 100% then based on one month after battery was about 70% would mean that it consumed 15W energy during power off for one month making it equal to about 0.5W a day.
Anyway since my Air was manufactured 5.5 month ago before I got it calculating roughly fully charged battery divided by days from manufacturing date equals to 50/165=0.3W. Meaning if Air 2018 consume even 0.3W or more a day when powered off that would drain battery completely during that time. So I guesss natural reason why I received mine with 0% battery charge must have been from long time since manufacturing date. So that sound plausible?
I mean checking sleep mode power consumption listed on the same document using the same formula as above would equal just about one week to maybe 10 days in sleep mode until battery goes from 100 to 0%. That can't be right since aren't these capable of 30 days sleep mode or what does Apple mean in there technical specs for this model where they list up to 30 days in standby mode (that can't mean power off, or does it?)?