Solar DCDB Panel
The DC distribution box protects the DC side of a solar system. It brings the PV strings together and provides DC fuses, a DC isolator and DC surge protection before the inverter.
DCDBs are sized for the string voltage, number of strings and current, in weatherproof enclosures for outdoor use.
Solar DCDB Panel specifications
| Specification | Value |
|---|---|
| Rated / operating voltage | Up to 1500V DC |
| Rated Current | Up to 125A |
| Protection Class | IP65/IP66/IP67 |
| Phase Configuration | 1-Phase and 3-Phase |
| Power Capacity | Up to 100KW |
| Standard | IEC-60349/IEC-61439-1&2 |
Ratings shown are typical catalogue values. Final specification is confirmed per order.
Specifying a solar DCDB
A DCDB protects and isolates the PV strings before they reach the inverter. It typically holds gPV fuses for each string, a DC isolator rated for the system voltage, and a Type 2 DC surge protective device. All components must be rated for DC at the maximum open-circuit voltage of the array, which is higher on cold mornings.
Share the number of strings, the string open-circuit voltage and short-circuit current, and the inverter inputs. For larger plants needing current monitoring per string, see the string monitoring and combiner box. On the AC side, see the solar ACDB; and see PV modules and all solar equipment.
Where it is used
- Rooftop solar systems
- Small and medium ground-mounted plants
Solar DCDB Panel – FAQ
Why is DC surge protection needed?
Long PV cable runs can pick up lightning-induced surges; DC SPDs protect the inverter and modules from these transients.
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