1. Choosing a Shipping Channel: Express, Dedicated Lines, and Sea Freight
When shipping photovoltaic (PV) component samples, the choice of channel depends on three factors: weight, delivery speed, and cost. For small samples (such as mounting accessories, connectors, or wire harnesses weighing a few kilograms), international express services like DHL, FedEx, and UPS are the best choice; they offer door-to-door delivery within 3–5 days, allowing customers to quickly verify the product.
For medium-weight shipments (ranging from tens to one or two hundred kilograms), dedicated air freight lines are more cost-effective, with a transit time of about a week. For large batches (palletized shipments), LCL (Less than Container Load) or FCL (Full Container Load) sea freight options offer the lowest costs but longer lead times; these are suitable for shipping alongside formal orders. Before shipping, obtain and compare quotes from express carriers or freight forwarders.
Note that international express services charge based on the greater of actual weight or volumetric weight (calculated as Length × Width × Height ÷ 5000, or ÷ 6000 for some channels). For long items like mounting brackets, it is crucial to calculate the volumetric weight accurately to avoid unexpectedly high shipping costs.
2.
Determining Costs and Sample Policies
There are three common models for handling sample costs: First, providing free samples with the sender covering shipping costs—suitable for cultivating key clients or high-value orders. Second, charging a sample fee with shipping costs billed to the recipient (paid via the recipient’s account or upon delivery)—this helps filter out a large number of non-serious requests. Third, charging for both the sample and shipping upfront, then deducting these costs from the payment once a formal order is placed; this is the most secure industry practice, as it verifies the customer’s sincerity while facilitating a sale.
When opting for “freight collect” (third-party payment), ensure the recipient has an express account and that the destination country permits this payment method, as some countries do not accept recipient-paid shipments.
When establishing a sample policy with a client, it is advisable to specify in writing that “sample fees are deductible from the first order payment,” along with the sample quantity and delivery timeline, to prevent future disputes.
III.
Customs Clearance Documents and Declaration Essentials
All cross-border samples require a commercial invoice (with the exception of documents having no commercial value); samples are no exception. The invoice must clearly state the full product description, quantity, unit price and total price, country of origin, HS code, and intended use (sample/sales/repair).
A pro forma invoice may be used for samples not intended for resale.
Low-value samples exported from China (declared value under RMB 5,000, reasonable quantity, and not subject to license controls) can be declared via simplified express channels, whereas shipments exceeding RMB 5,000 in value or quantity limits require formal customs declaration.
Note that as of August 29, 2025, the US has eliminated the “de minimis” exemption threshold; all incoming goods must be declared to US Customs and may incur duties and clearance fees. For samples sent to the US, inform the client in advance that duties may be borne by the recipient, or select the DDP (Delivered Duty Paid) option—where the sender covers the costs—to avoid the client refusing delivery.
IV.
Dangerous Goods Declaration for Samples Containing Batteries
Photovoltaic components containing batteries (such as energy storage power supplies, portable power stations, and inverters with built-in batteries) are classified as Class 9 dangerous goods. International express shipments must be declared in accordance with UN3480 (standalone batteries) or UN3481 (batteries contained in equipment) regulations. Required documentation includes the UN38.3 test report, MSDS, and a transport identification certificate. Standalone batteries must be shipped via Cargo Aircraft Only (CAO), and the state of charge (SoC) is typically required to be no higher than 30%.
DHL, FedEx, and UPS have specific rules for shipping lithium batteries, and the express carriers’ standard packaging must not be used for transporting dangerous goods.
General cargo samples—such as brackets, cables, and connectors that do not contain batteries—are not subject to these restrictions;
however, one should still verify whether the items are subject to export controls before shipping to prevent seizure by customs in the destination country.
V. Packaging and Follow-up Details
Packaging directly determines the quality of the sample upon delivery: secure long guide rails and precision parts in thickened cartons lined with bubble wrap or foam to prevent shifting during transit; affix “Fragile,” “Keep Dry,” and “This Side Up” labels to the outer carton;
place the invoice in a transparent, waterproof pouch on the outside of the box and a spare waybill inside; and remove old labels from the box to prevent sorting errors. Establish a closed-loop follow-up process after shipment: share tracking numbers with the client in real-time, request testing feedback within 48 hours of delivery, agree on a feedback deadline, and log this in the CRM system;
for high-value samples, consider laser-marking the word “sample” on the product to prevent resale.
If the client is slow to respond, follow up with inquiries regarding “testing progress + suggestions for next steps in cooperation,” thereby turning the sample shipment into an opportunity to advance the order.
Conclusion
The shipment of photovoltaic component samples can be summarized as: “choose channels based on item size, determine costs based on sincerity, and prepare documentation according to regulations.” Use express services for small items and dedicated lines for large ones;
allow sample fees to be offset against the final order payment; ensure commercial invoices and HS codes are accurate and included;
and strictly declare samples containing batteries as dangerous goods. When samples are handled well, orders are sure to follow.
