Anyone interested in sharing experiences with bike conversions:
Hopefully I have attached a photo of my 94 Trek mountain bike with a Bafang BBS02 middle motor attachment powered by a 48V battery (bought on Aliexpress)
Costs
Bike SF 150 at a velobörse
Conversion kit SF 800
Time -a couple of days using You tube to help me with the instructions
Running for 3 months -goes like a rocket

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If I may ask, what speeds have you achieved with this contraption?

It's not clear on the pic, the motor "latches-on" to front-inner chainring?

No issues so far with this wet weather?

The motor comes with a crank, chain wheel and pedal arms. I chose 46 teeth for the chain wheel which replaced the three chain wheel /Shimano shifter. This was much easier than trying to retain the shifting set which is technically possible.
Max speed depends on the hill! I have set the control mechanism to stop the assistance at the legal max of 25kmh, but there is a throttle over-ride Increasing the amount of help one receives uses up the battery charge noticeably quicker, but charging on descents seems to function really well. I am less interested in speed than in help getting up the hills
Legal max without registration is a 500Watt motor, but Bafang also sell 750W and now 1000W versions.
I have found the side mirror to be a total plus -why are they not standard on all bikes?
Now I want to see how the reliability of the Bafang motor compares with my wife's Saxonette and our son's flyer - mine is definitely the more fun to ride.

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I have been looking into getting one of these Bafang conversion kits, I was curious about your experiences. Did you have to do anything to prove to customs or the city that the kit conformed to a particular standard, like speed or motor or anything? Where did you get the kit, I am thinking of ordering one from China, but maybe that causes issues with customs.
What size motor did you go with? Is there actually a difference between their motors rated at 250, 350, and 500w? I read somewhere that they are essentially the same motors with different spec ratings to appeal to different markets and standards.
Also, how are the hills with this?
Anyway, thanks for the post!