In this video I connect a Kill-A-Watt power meter to an early 2015 MacBook Pro Retina for a few days. This MBP has been upgraded with a Samsung SSD. You can find a video on it here: https://youtu.be/4SSxtWPogFQ
P3 International P4460 Kill A Watt EZ Electricity Usage Monitor (Amazon affiliate)
US: https://amzn.to/2TZa4u4
CA: https://amzn.to/3izkEoe