At Kampsol Industries, we design and manufacture high-quality DC Distribution Boxes (DCDBs) that ensure safe and efficient management of solar power. A DCDB plays a vital role in any solar photovoltaic (SPV) system by consolidating the DC output from multiple solar panel strings and providing necessary protection before feeding power to the inverter.
Introduction
Every solar inverter and charge controller, whether part of a grid-tied or stand-alone system, operates within a specific DC input voltage window that must be maintained for optimal performance. In battery-less grid-connected solar systems, inverters typically require a high DC input voltage ranging between 90V to 850V, depending on the number of solar modules connected in series (usually 4 to 26 modules).
In smaller solar PV systems (under 5 kW @ 600V DC), there are often only one or two module strings connected in series. At Kampsol Industries, our engineering team carefully designs and configures the Solar Junction Box (SJB) or DC Distribution Box (DCDB) based on the technical specifications of the inverter and solar modules.
The combiner box (DCDB) serves as a central point to merge multiple string inputs, house protection fuses, and streamline wiring—significantly reducing the number of DC cables running from the solar array to the inverter.
While some modern inverters come with built-in series fuses or integrated disconnects, using a dedicated DCDB near the solar array provides easier access for monitoring, maintenance, and troubleshooting. This ensures quick fault isolation and enhances the overall safety and reliability of the solar PV system.
Features
Tested & Certified – All Kampsol DC Distribution Boxes comply with IEC/IS standards, ensuring international quality and performance.
Enhanced Safety Access – Designed with tool-based access to prevent unauthorized handling and ensure electrical protection.
Customizable Design – Tailor-made configurations available to meet specific project and client requirements.
Reliable Electrical Safety – Offers complete protection against short circuits, reverse polarity, and DC faults.
Efficient Cable Management – Neat and organized internal layout for simplified wiring and servicing.
Wall-Mount Design – Compact, weatherproof, and easy to install and maintain at site.
Weatherproof & Secure Terminals – Each terminal is insulated and sealed using PG cable glands or MC4 connectors, making it suitable for outdoor installations.
System Protection – Provides fault isolation and safeguards the DC side during system abnormalities or failure.
Technical Specification
| Model |
GPRO-GD5X |
GPRO-GD10X |
| Maximum Voltage in open Circuit |
500V |
1000V |
Input
| No of DC inputs |
1-6 |
1-12 |
| Maximum Input Fuse* Rating, A * |
6/10/12/15/20/30 |
| Max Input Current in short Circuit |
| Max. input current in short circuit at STC |
| Maximum string current per fuse holder with all string fuse* |
Reduction factor 0.55 |
| Conductor Size , Sq.mm |
4 — 10 Sq.mm |
Output
| No of DC inputs |
150 Sq. |
| Maximum DC Current, A * |
Upto 32A |
Upto 32A |
| Conductor Size, Sq.mm |
4 — 10 Sq.mm |
4 — 10 Sq.mm |
| Cable gland clamping range,mm |
12-32 |
Protection
| DC inputs overcurrent protection |
Protection on both polarities, gPV fuses, size 10 x 38 mm, max. rating 30 A (fuses not provided with product) |
| Surge Protection Device (SPD)* |
<=600V DC, Class C/Class B/ Class B+C |
1000V DC, Class C/Class B/ Class B+C |
| Electric shock protection |
Class II equipment |
General
| Ingress Protection |
IP66/65 |
| Enclosure Type |
PS*/PC, |
| Transparent |
Top Cover |
| Wall mounting |
Yes |
| Bus Bar* |
Yes |
| Operating conditions Temp: |
-20 to +55 Deg. C , RH : 0 — 95% non cond |
| Type of Protections |
Short-Circuit,Surge |
| International standards followed |
IEC 60364 |
| Design Life |
25 years + |
