Direct current distribution and protection for solar arrays and battery storage.
Our DC Distribution Boards are built with devices rated specifically for direct current, which does not have the natural zero crossing that helps an AC device break a fault. String fuses, DC-rated isolators and surge protection are selected accordingly. Enclosures are fabricated from 1.5 or 2.0 mm CRCA sheet and supplied at IP45 for indoor use or IP65 where the board is mounted in the field.
A DCDB collects the DC output of several photovoltaic strings or battery banks, protects each string individually and combines them into a single conditioned feed to the inverter or charge controller. String inputs are configured to suit the array design, each with its own fuse, and Class-II surge protection is fitted to guard the inverter against lightning-induced transients. DC voltmeters and ammeters with indication lamps allow string performance to be checked without opening the enclosure.
Straight answers to common questions about the DCDB Panel.
A DC distribution board collects the DC output of solar strings or battery storage and passes it on with DC rated protection, isolation and surge protection.
AC current passes through zero a hundred times a second and the arc goes out at that moment. DC has no zero crossing, so the arc has to be stretched and cooled until it extinguishes. A device built for AC can carry DC current and still fail to interrupt a fault, so our DCDBs use DC rated devices.
The specification lists up to 1000 V DC. A string fuse should be rated above the string open circuit voltage at the lowest cell temperature you expect, which is higher than the figure on the module label.
The specification lists DC surge protection and fuse protection, a DC MCCB or fuse base incomer, DC MCB, fuse and SPD outgoing devices, and a DC voltmeter and ammeter with indication lamp. The number of strings is configurable to the array design.
IP45 is offered for indoor use and IP65 where the board is mounted in the field. A sealed board holds heat, so check the thermal design for the site ambient.
Send the array layout with the number of strings, the string voltage and current, the module datasheet, the inverter model and the installation environment.
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