This is coming from an adult:
If I were to do it over, I would get an e-bike with the smaller diameter wheels. I have a Eunorau eBike and it is huge. It weighs 80 lbs (which most are heavy) but the size is very large and makes it difficult to transport. It barely fits in the back of my truck. As far as power....mine is 1000w motor and it hauls. Last year I took a trip to San Francisco and this bike zipped up the hills faster than most cars.
