DC SPD protects the PV array side and must match DC voltage, while AC SPD protects inverter output or downstream AC circuits and follows AC system voltage and grid arrangement.
The two devices are not interchangeable. The side of the inverter, voltage type and earthing system decide the SPD selection.
How buyers should read this
Many PV systems use both DC SPD and AC SPD in different parts of the installation.
- DC voltage class
- AC grid voltage
- Type 1 or Type 2
- Earthing arrangement
- Enclosure location
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 DC SPD vs AC SPD for Solar PV? | DC Protection, AC Protection | Buying only by product name |
| Specification input | What must be stated before comparing quotes? | DC voltage class | Use the same specification wording across supplier quotes. |
| Commercial input | What makes the quote operationally useful? | AC grid voltage | Tie quantity, packing and destination to the same RFQ line. |
| Quality gate | What should be checked before shipment? | DC Protection Selection Guide | Leaving voltage or rating undefined |
BOM and RFQ context
DC SPD vs AC SPD for Solar PV is most useful when it is read as a sourcing decision, not only an informational article. The affected product scope normally includes DC Protection, AC Protection. 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 voltage class, AC grid voltage, Type 1 or Type 2, Earthing arrangement. These inputs let a sourcing team compare suppliers on the same basis instead of only comparing unit price.
The related follow-up content is DC Protection 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.