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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

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