my roommates claim that my 400W ebike has increased the electricity bill by 100 euros, is that possible?

Posted by StunningBaseball5479@reddit | ebikes | View on Reddit | 151 comments

the electricity rate is 0.36 euros per kWh, I made my calculations again and again and it seems impossible that recharging that battery once in two days for two month could consume anything more than 12 kWh per month, is there any certain circumstance that something could cause it to consume more ? I want to be certain whether that I'm causing extra expenses on them (so that I take responsibility and pay extra to cover it) or whether they're wrong