Those HDD will quickly add to total power consumptions

OP was trying to replace streaming services, so he gonna need storage. Assuimg he had 3 hdd for raid 5, that is another 15*3 = 45w

Looking at a WD spec sheet, it's more like 6-7W during read/write, and 3-4W during idle (1W sleep). Assume your use spread however you want, but that would be a max average of 5W usage per drive, so another 5-20W depending on your storage needs.