power usage is much less intuitive than you'd think. a 1000w (2kw usage) microwave running for two 30 second runs to heat up food twice a day, could be fed with a single tiny 3-cell 33Wh powerbank (3x 3000mAh * 4v 18650 = 36Wh) whereas the basic ~100w always active ventilation of the average (european) house/toilets will accumulate 2-3000Wh a day, about 5-7 big ebike batteries worth with each 36 cells (36* 3000mAh * 4v = 432Wh) #PowerUsage #Electricity