Hi, about 2 years ago, I bought that Chinese 60V 800W scooter, and so far everything has gone OK. I then bought a small range extender petrol motor that generates 60V 1000W. The problem started when I tried to charge the battery with that petrol motor. It blew the BCDC controller, and I got stranded at night 6 km from home. People saw me (I'm 83 y.o.) and came to rescue me. In the end my friend towed me with his Nissan safely home.
Since I enjoyed electronics all my life, I thought of adding a rescue system, consisting of brushed motor 60V 800W, a 60V 10A battery, and a simple PWM controller.
Could you knowledgeable experts please give me some good advice on my circuit idea. That would be of great help.
It could have been that the petrol motor's output needed some smoothing that destroyed the BLDC controller.

 

So you are proposing adding another complete drive system as backup? That sounds a bit extreme.

Why not investigate what went wrong and fix it so the same thing does not occur again?

 

How was the generator connected when it blew the BCDC controller?
Was the battery also connected?

 

Hi, a petrol motor doesn't make electricity.
You have to connect a generator to the petrol motor which then generates AC.

and yes you can not connect AC to your DC battery.
you need a rectifier bridge of sufficient size and then smoothen the pulsed DC.

If you could post specifics about your 60V generator and it's output, that is what would be needed for us to help you troubleshoot.

your scooter has enought space to add a battery of the size to let you go from one side of the country to the other.
A 6kWh battery costs 900€ and you can floor that thing and drive for 7.5 hours + the time of the original battery.

 

I have seen a poor quality engine driven generator destroy an expensive switch mode power supply in just a very few seconds, because of a stuck speed regulator.
So, what can you tell us about that "a small range extender petrol motor that generates 60V 1000W"??
Battery charging requires some control, and current limiting. The automotive 12 volt wet batteries can survive a bit of abuse, but the modern battery packs with their battery management system are more fragile.
I suggest replacing your damaged BLDC control module so that your scooter will be useful again. That 60 volt petrol power producer can be deadly to sensitive electronics. It might be OK charging a battery pack not connected to anything else, maybe. . HF has a good point about having room for a second battery, although I have no idea about what you already carry along.