A 200 watt engine is completely and utterly useless. It's not even worth considering as a usable option and is a totally worthless investment when it comes to an alternative form of transport.
As much as i don't like to say it, (and it doesn't matter which way you look at things), you have to break the law when it comes to a meaningful level of motorised power assistance, because the notion of having useful power assistance when traveling up steep hills is completely incompatible with 200 watts of supplementary power; even 1000 watts barely gets the job done.
A 200w motor will not propel you at a good clip without pedaling. I have a 24v motor on my bike that will accelerate me to about 12mph, and then my legs take over. It is easier on my knees than an unassisted bike.
A 200w motor will not propel you at a good clip without pedaling. I have a 24v motor on my bike that will accelerate me to about 12mph, and then my legs take over. It is easier on my knees than an unassisted bike.