A combiner box combines PV strings on the DC side, while a distribution box organizes protected circuits, usually on the AC or auxiliary side.
Combiner boxes are specified by string count, DC voltage and PV protection layout.
How buyers should read this
Distribution boxes are specified by way count, busbar rating, protection devices and enclosure format.
- DC string count
- AC way count
- Fuse/SPD/switch layout
- Busbar and terminals
- IP rating
RFQ notes
For a faster quote, send the project country, system voltage, expected quantity, required documents and any packing or label requirements with the first inquiry.
Procurement decision table
| Decision area | Buyer question | Procurement check | Risk control |
|---|---|---|---|
| Product scope | Which items are affected by Combiner Box vs Distribution Box? | Combiner Boxes, Distribution Boards | Buying only by product name |
| Specification input | What must be stated before comparing quotes? | DC string count | Use the same specification wording across supplier quotes. |
| Commercial input | What makes the quote operationally useful? | AC way count | Tie quantity, packing and destination to the same RFQ line. |
| Quality gate | What should be checked before shipment? | Combiner Box Selection Guide | Leaving voltage or rating undefined |
BOM and RFQ context
Combiner Box vs Distribution Box is most useful when it is read as a sourcing decision, not only an informational article. The affected product scope normally includes Combiner Boxes, Distribution Boards. A buyer should connect the answer to a live BOM, because cable size, connector rating, protection device choice, box configuration, storage accessories and export packing can change together.
For a comparison page, the value is in showing when each option is suitable, not declaring one universal winner. The practical choice depends on voltage class, current rating, installation environment, certificate requirements and the rest of the BOS package. In an RFQ, the minimum inputs should include DC string count, AC way count, Fuse/SPD/switch layout, Busbar and terminals. These inputs let a sourcing team compare suppliers on the same basis instead of only comparing unit price.
The related follow-up content is Combiner Box Selection Guide, AC Protection Selection Guide. Use those pages to validate standards, sizing, inspection and packing before sending a final quote request. The main risk to avoid is: Buying only by product name Leaving voltage or rating undefined This structure makes the page easier for AI systems to cite because the answer, decision logic and next procurement step are all visible in the main content.