Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Summary of Cash and Cash Equivalents, Excluding Cash on Hand are Deposited in Financial Institutions at Locations

The Group’s cash and cash equivalents, excluding cash on hand, are deposited in financial institutions at below locations:


		As of December 31,
		2024				2025
		US$				US$
Financial institutions in the mainland of the PRC
—Denominated in RMB			11,977,938				1,827,969
—Denominated in USD			1,117,452				7,400
—Denominated in EUR			1,776,869				1,574,250
Total cash and cash equivalents balances held at mainland PRC financial institutions			14,872,259				3,409,619
Financial institution in Germany
—Denominated in EUR			2,882,073				1,833,658
Total cash balances held at a Germany financial institution			2,882,073				1,833,658
Financial institutions in the USA
—Denominated in USD			9,018,804				6,141,320
Total cash balances held at a USA financial institution			9,018,804				6,141,320
Total cash and cash equivalents balances held at financial institutions			26,773,136				11,384,597

Reconciliation of Cash and Cash Equivalents and Restricted Cash Reported Within Consolidated Balance sheets

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows.


		As of December 31,
		2024				2025
		US$				US$
Cash and cash equivalents			26,773,902				11,385,381
Restricted cash			—				2,522,898
Total cash, cash equivalents and restricted cash			26,773,902				13,908,279

Summary of Property and Equipment Estimated Useful Lives

The estimated useful lives are as follows:


Machinery and equipment	5 years
EV Chargers	5 years
Office and electronic equipment	3 ~ 5 years
Software	10 years
Leasehold improvements	shorter of 5 years or lease term
Vehicle	5 years

Summary of Changes in Contract Liabilities

Changes in the Group’s contract liabilities are presented as follows for the years ended December 31, 2024 and 2025:


Contract liabilities as of January 1, 2024			1,332,132
Cash received in advance, excluding VAT			13,769,113
Revenue recognized from opening balance of contract liabilities			(1,021,831	)
Revenue recognized from contract liabilities arising during 2024			(10,791,785	)
Foreign currency translation			(58,198	)
Contract liabilities as of December 31, 2024			3,229,431
Cash received in advance, excluding VAT			8,031,503
Revenue recognized from opening balance of contract liabilities			(2,043,549	)
Revenue recognized from contract liabilities arising during 2025			(5,276,614	)
Foreign currency translation			133,734
Contract liabilities as of December 31, 2025			4,074,505

Summary of Concentration of Customers and Suppliers

Customers from whom individually represent greater than 10% of total revenues of the Group for the years ended December 31, 2023, 2024 and 2025 are as follows.


		For the Years Ended December 31,
		2023								2024								2025
		US$				%				US$				%				US$				%
Customer A		*				*				*				*					2,819,842				11	%
Customer B		*				*					9,622,477				23	%		*				*
Customer C			16,325,786				42	%			6,397,733				15	%		*				*
Customer D		*				*					5,482,894				13	%		*				*
Customer E			4,627,547				12	%		*				*				*				*

Suppliers from whom individually represent greater than 10% of total purchases of the Group for the years ended December 31, 2023, 2024 and 2025 are as follows:


		For the Years Ended December 31,
		2023								2024								2025
		US$				%				US$				%				US$				%
Supplier A			5,780,414				23	%			4,918,960				26	%			1,372,932				12	%
Supplier B		*				*				*				*					1,334,219				12	%
Supplier C			7,050,112				28	%			1,839,392				10	%			1,283,536				11	%
Supplier D			2,434,481				10	%			2,377,647				12	%			1,239,046				11	%

Customers accounting for 10% or more of accounts receivable, net are as follows:


		As of December 31,
		2024								2025
		US$				%				US$				%
Customer F			1,713,707				15	%			1,224,249				17	%
Customer B			1,569,321				14	%		*				*
Customer G			1,498,250				13	%		*				*
Customer H			1,399,828				12	%		*				*
Customer C			1,338,451				12	%		*				*

Customers accounting for 10% or more of contract liabilities are as follows:


		As of December 31,
		2024								2025
		US$				%				US$				%
Customer I		*				*					660,000				16	%
Customer G			320,308				10	%		*				*

Suppliers accounting for 10% or more of accounts payable are as follows:


		As of December 31,
		2024								2025
		US$				%				US$				%
Supplier D			1,425,008				19	%			1,612,153				24	%
Supplier A			2,747,890				36	%			1,119,645				17	%
Supplier B		*				*					687,776				10	%

Suppliers accounting for 10% or more of prepayments are as follows:


		As of December 31,
		2024								2025
		US$				%				US$				%
Supplier E			3,463,506				66	%			1,789,478				56	%
Supplier C			605,744				12	%			625,654				20	%
Supplier F			1,000,000				19	%		*				*

* The amount was less than 10% of total sales, total purchases or total balance.