Solar modules, inverters and stationary battery energy storage systems (BESS) look like one product family but ship as three different kinds of cargo. A solar module is not dangerous goods, but it is glass, so the risks are breakage and hidden microcracks. An inverter is usually plain electrical freight. A battery storage system almost always contains lithium-ion cells, which makes it regulated dangerous goods (Class 9) and, by air, a much narrower and more expensive option. On top of that, solar imports into the United States sit under several overlapping duty measures that changed repeatedly in 2025 and 2026. The sections below cover each layer in the order a shipment meets it. For the wider battery rules, see our guide to shipping lithium batteries by air and sea.
How are solar panels shipped?
Solar modules travel upright on wooden or cardboard pallets, strapped and wrapped, and are normally loaded into 40-foot high cube containers. The panels stand on their long edge inside a carton or between corner protectors, so a pallet is a tall block of glass rather than a flat stack. Pallet counts depend on the module size and the manufacturer, so never assume a figure from another brand.
As one named example, LONGi's published packaging instruction for a 54-cell module of about 1722 x 1134 mm lists 36 modules per pallet and 26 pallets, or 936 modules, in a 40-foot high cube container. Larger 72-cell formats of roughly 2278 x 1134 mm pack fewer modules per pallet (reseller listings for LONGi 72-cell models show about 31 to 36), so a container carries fewer panels. Treat any such figure as the manufacturer's own for that exact model, and ask the supplier for the packing list before you book. Our high cube versus standard container guide explains why the extra foot of height matters for tall pallets.
Because modules are light for their volume, a container usually fills up before it reaches its weight limit, but check the pallet weights against the container payload anyway. Some manufacturers allow a second layer of pallets and others do not, which changes the count per container.
What goes wrong: breakage, microcracks and claims
The common loss is not a smashed carton you can see at the door. It is a pallet that looks intact and contains cracked cells. Manufacturers' own handling guides (REC, Jinko and LONGi publish them) repeat the same points:
- Stacking limits. The guides we reviewed generally allow at most two pallets high, and some allow a second layer only for identical pallets, secured with loading bars or air bags. Follow the guide for the exact model.
- Forklift handling. Lift slowly, keep the tines clear of the cartons and move pallets from the short side. LONGi's guide names impacts from the fork backrest as a leading cause of damage.
- Orientation. Keep pallets upright as marked. Laying a pallet flat or tilting it loads the glass in ways the pack was not designed for.
- Storage. Keep them dry and off the ground, and do not leave open pallets in rain at the port or site.
Microcracks in cells are invisible to the eye. Industry commentary points to electroluminescence (EL) imaging as the way to find them, and some buyers specify EL testing of a sample on arrival. Whether to do it is a contract question between buyer and supplier, not a rule.
For claims, the practical steps are to photograph the container seal and the pallets before unloading, note damage on the delivery receipt, keep the packing and EL evidence, and file within the carrier's time limits. Our guides on cargo securing inside the container and how to file a cargo claim cover the blocking, bracing and claim steps in detail. A shipper who has not secured the load, or who cannot show the pallets were in good order at origin, usually has a weak claim.
Are solar panels and batteries dangerous goods?
A common misconception is that anything energy-related is dangerous goods. A standard crystalline silicon module has no UN number and needs no dangerous goods declaration. An ordinary string or central inverter without a battery is likewise normally treated as general cargo. Stationary batteries are different.
| Item | Usual status | Note |
|---|---|---|
| Solar modules | Not dangerous goods | Fragile; breakage and microcrack risk |
| Inverter without battery | Normally not dangerous goods | Check the supplier's data sheet |
| Lithium-ion battery packs or racks shipped separately | UN 3480 (batteries alone) or UN 3481 (packed with or contained in equipment) | Class 9; UN 38.3 test summary required |
| Complete BESS container with batteries installed | Often UN 3536, lithium batteries installed in a cargo transport unit | Special provision 389; marking and placarding; no air carriage |
| Hybrid inverter with built-in battery | Likely UN 3481, depends on the product | Confirm the manufacturer's transport classification |
The classification is the manufacturer's to state, in a safety data sheet and a transport classification letter. Do not guess it from the product name. PHMSA's interpretations of the US hazardous materials rules describe UN 3536 as covering lithium batteries installed in a freight container that is itself a cargo transport unit, designed to supply power outside the unit, and say the unit carries the UN number and Class 9 placards. Our IMDG and IATA regulations guide and the dangerous goods declaration guide explain the paperwork that follows.
Shipping a battery energy storage system by sea
By sea, lithium-ion batteries move under the IMDG Code. The current amendment (42-24) entered into force on 1 January 2026 according to the Hong Kong Marine Department; confirm the edition your carrier is applying. Before booking, expect to give the carrier the UN number and proper shipping name, the net weight of the cells or battery, the UN 38.3 test summary, the safety data sheet and a dangerous goods declaration. Many carriers restrict or require prior approval for large lithium battery loads, so ask the carrier before you quote the customer.
A fully installed BESS container needs correct marking of the unit, and under PHMSA's reading of special provision 389 it must not carry other hazardous materials that are not needed for its own operation. Stowage and segregation follow the vessel's rules. Batteries are often shipped at a partial state of charge, and the manufacturer's transport instruction should state it. We could not confirm a single IMDG state-of-charge limit for UN 3480 from public sources, so rely on the manufacturer and carrier instructions rather than a number from the web.
Shipping batteries by air
By air the position is stricter. Under IATA Packing Instruction 965 Section IA, UN 3480 lithium-ion batteries are forbidden on passenger aircraft and may fly only on cargo aircraft with the Cargo Aircraft Only label. The batteries must be offered at the lowest practical state of charge and not above 30 percent of rated capacity, and a higher state of charge needs approval from the State of Origin and the State of the Operator. A shipper's declaration for dangerous goods is required. Public summaries we found also list UN 3536 as forbidden on both passenger and cargo aircraft, although an ICAO working paper has discussed a cargo-aircraft option, and we found no confirmation that it has been adopted.
So a full BESS container is, in practice, a sea shipment. Air freight is realistic for modules, inverters and small battery components, not for containerised storage. Always check the current IATA Dangerous Goods Regulations edition with your carrier, because the limits are revised often.
HS codes for solar modules, inverters and batteries
The Harmonized System classifies the exact product, and a combined system sold as a unit may be classified differently from its parts. These are the headings importers most often use, to be confirmed against the national tariff:
- 8541.43: photovoltaic cells assembled in modules or made up into panels (from HS 2022).
- 8541.42: photovoltaic cells not assembled in modules or panels.
- 8507.60: lithium-ion accumulators.
- 8504.40: static converters, which is where most inverters are classified.
A complete containerised BESS can raise classification questions, and customs authorities do not always agree, so consider a binding ruling. Our HS code guide shows how to build the classification step by step.
US duties on solar imports as of November 2026
The duty picture is the part most likely to change after this article is published. Everything below was checked in early November 2026 against Commerce, the White House and trade press; verify with CBP and your customs broker before you rely on it.
- Antidumping and countervailing duties, four countries. Commerce announced final affirmative determinations on crystalline silicon photovoltaic cells and modules from Cambodia, Malaysia, Thailand and Vietnam in April 2025, and orders followed in June 2025. Cash deposits are company-specific, so you need the producer's exact rate.
- India, Indonesia and Laos. Commerce announced final affirmative determinations on 11 September 2026. Its trade.gov page lists antidumping margins of 123.04 percent for India, 94.36 percent for Indonesia and 65.43 percent for Laos, and countervailing duty rates from 73.20 percent to 173.70 percent depending on country and company. The International Trade Commission reported an affirmative injury finding in October 2026, and press coverage says orders are due in early November 2026. Confirm in the Federal Register whether the orders have been published.
- Section 201 safeguard. It expired in February 2026, and the August 2026 proclamation describes its measure as replaced.
- Section 232 on polysilicon and derivatives. Proclamation 11052, dated 6 August 2026, applies to goods entered or withdrawn from warehouse on or after 12:01 a.m. eastern time on 4 December 2026. It sets minimum import prices of $0.38 per watt for modules, $0.22 per watt for cells, $100 per kilogram for ingots and wafers and $21 per kilogram for polysilicon, plus an additional 15 percent duty on ingots and derivatives. The UK rate is 10 percent, and for the EU, Japan, Korea, Taiwan, Switzerland and Liechtenstein the Section 232 duty is set so that it plus the ordinary duty equals 15 percent. Importers certify the first arm's-length sale price, and a materially inaccurate certification can lead to a permanent import ban for the importer and its affiliates.
- Section 301. Chinese-origin solar cells and modules have been subject to Section 301 duties, and law firms describe the interaction with the new Section 232 action differently. We could not resolve that from the proclamation text, so ask your broker.
- Forced labor enforcement. Polysilicon is a named priority sector under the Uyghur Forced Labor Prevention Act, and detentions of modules for supply chain tracing do occur. Read our UFLPA guide and keep traceability records from polysilicon to module.
For how antidumping and countervailing deposits work and why a rate depends on the producer and exporter, see anti-dumping and countervailing duties explained. In practice duty layers can outweigh the freight cost, so the entry date and the producer name matter more than a small difference in container rate.
Checklist before you book solar or storage freight
- Get the packing list per pallet: modules per pallet, pallet weight and dimensions, stacking limit.
- Decide the equipment (usually a 40-foot high cube for pallets) and check the payload.
- For batteries, get the UN number, proper shipping name, UN 38.3 test summary and safety data sheet from the manufacturer.
- Check the carrier's acceptance of lithium batteries and any prior approval for large units.
- Confirm the mode: UN 3480 by air is cargo aircraft only, and UN 3536 is not an air product.
- Collect the producer name and cell origin for duty and forced labor tracing.
- Photograph the pallets at loading and at delivery, and insure the cargo for its full value.
What to do next
- Ask the supplier for the module datasheet, packing list and transport classification of every battery item.
- Classify each line under the HS and ask your customs broker which antidumping, countervailing, Section 232 and Section 301 measures apply to your producer and entry date.
- Ask two or three freight forwarders to quote separately for pallets and for dangerous goods, and make them state who prepares the dangerous goods declaration.
- Agree handling, inspection and claim terms with the consignee before the cargo sails.
You can search more than 29,300 logistics companies by country and service in the CargoLinked directory to find forwarders that handle dangerous goods and project equipment. The public requests board lists freight that shippers have posted for forwarders to quote on directly.
This article is general information as of November 2026, not legal, tax, customs or dangerous goods advice. Duty measures and dangerous goods regulations change often. Confirm the current rules with the issuing authority, your carrier and a licensed customs broker or dangerous goods safety adviser before you ship.
