A solar power system looks like one product on the invoice and four products in the tariff schedule. The panel is a photovoltaic cell or module, classified under heading 8541, which covers photosensitive semiconductor devices including photovoltaic cells whether or not assembled into modules or made up into panels. Complete photovoltaic modules and panels sit at 8541.40. Individual cells not yet assembled into modules fall under the same heading at a different subheading.
The inverter is a different machine with a different job. It converts the panel's DC output to AC, which makes it a static converter under heading 8504, at 8504.40. The battery is a third heading: lithium-ion storage batteries are 8507.60, and lead-acid batteries for solar applications sit elsewhere in 8507. Mounting structures are a fourth, going to 7308 for iron or steel structures or 7610 for aluminum. Each component needs its own line on the entry, with its own code and its own duty rate.
The argument starts when the components ship together as a kit: a panel, an inverter, a controller, and a battery in one box, sold as a solar power set. GRI 1 cannot settle it, because the set is prima facie classifiable under more than one heading. GRI 3 takes over, and GRI 3(b) asks which component gives the set its essential character.
For a solar kit the answer is usually the panel, because the panel is the reason anyone buys the set: it generates the power, and everything else converts, stores, or holds it. But the answer is not automatic. A kit built around a high-value inverter with a small panel could argue the other way, and a kit where the battery dominates the price and the use could argue a third way. Retail sets under GRI 3 show the same test in other products: value alone does not decide it, and CBP has ruled against the most expensive component before. Document the function, not the price.
Three mistakes recur. The first is classifying the whole system under 8541 because the panel is the biggest box. The inverter and battery have their own headings, and a single-line entry that lumps them under the panel's code understates the duty on the parts that carry a higher rate, and overstates it on the parts that carry a lower one. Either way the entry is wrong.
The second is forgetting the Section 232 exposure on the mounting structure and the Section 301 exposure on the Chinese-origin panel. The classification decides which trade measures apply, and a wrong code can mean a missed duty or a duty paid that was never owed. The third is classifying by the marketing name instead of the function. A "solar generator" is a battery with an inverter and a panel, and its code follows the components, not the brand name. Drones ran into the same trap: the name on the box is not the heading. When the call is close, search the CROSS database for how CBP classified a similar kit, and get a binding ruling before the first container ships.
Solar panels are classified under heading 8541, at 8541.40 for photovoltaic cells and modules. Individual cells not yet assembled into modules fall under the same heading at a different subheading.
Solar inverters are static converters under heading 8504, at 8504.40. Lithium-ion solar batteries are 8507.60, and mounting structures go to 7308 for steel or 7610 for aluminum.
A kit is classified under GRI 3, and GRI 3(b) asks which component gives the set its essential character. For a solar kit that is usually the panel, because it generates the power, but the answer depends on function, not price.
No, not as one line. Each component needs its own entry line with its own code and duty rate. Lumping the inverter and battery under the panel's code makes the entry wrong in both directions.