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Summary of significant accounting policies (Details 1) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Summary of significant accounting policies      
Value-added tax refund $ 0 $ 465,072 $ 636,536
Becoming a public company 0 0 760,711
Investment grant 0 292,487 0
Equipment of energy projects grants 81,896 97,366 132,211
Research and development grants 0 71,058 0
Other miscellaneous grants 0 0 107,033
Total $ 81,896 $ 925,983 $ 1,636,491