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Advances to Suppliers, Net (Tables)
 12 Months Ended
Sep. 30, 2020
Major Suppliers [Abstract]  
Schedule of advances to suppliers and allowance for doubtful accounts
   As of September 30, 
   2019   2020 
Prepayment for purchase of battery packs  $-   $1,585,682 
Prepayment for purchase of e-bicycles materials   3,322,652    956,192 
Prepayment for purchase of battery cells for trading business   3,081,910    84,354 
Prepayment for service fees related to e-bicycles manufacturing licenses   529,309    120,936 
Others   9,800    38,650 
Less: allowance for doubtful accounts   (80,975)   (84,354)
Advances to suppliers, net  $6,862,696   $2,701,460