Voltage Group showcased its latest VOLTAGE LYNX series trunk bus system, to connect and consolidate multiple PV string input cables
It also displayed the latest VOLTAGE ALEX series aluminum extension system
The transitional joint between copper and aluminum wire (Cu-Al) of the VOLTAGE ALEX system features an anti-oxidation or anti-corrosion joint compound
The DC installation of a PV plant, regardless of the utility or DG (distributed generation) scale, constitutes a major portion of EPC work. Although smaller in scale for DG setups, a MW-scale plant requires careful design to reduce layout complexity and installation time.
Voltage Group, a US-based provider of electrical balance of system (BoS) solutions for utility-scale solar projects, introduced its latest product lineup during Intersolar Europe 2025.
Alongside showcasing its factory-assembled string wire harness solutions, the company’s booth featured the VOLTAGE LYNX trunk bus system.
A trunk bus system, featuring a main cable (trunk), is equipped with multi-channel molded inputs at set intervals. These molded units collect and consolidate multiple PV string output cables into the trunk.
According to the datasheet, the main trunk’s wire, typically made of copper, can measure up to 1000 MCM or 0.5 mm² in size. Each mold can be tailored for up to 6 string inputs.
The main trunk cable, rated for a maximum system voltage of 1,500 V DC, is capable of carrying a DC short-circuit current (Isc) of up to 845 A. To address the potential electrical hazard associated with high DC, this product is certified to relevant international standards. A trunk’s outer layer, typically made of plastic materials, is exposed to diverse external environmental stressors, like outdoor UV exposure. The company’s trunk bus system is certified to UL 746C standards, which means that it avoids safety risks posed by such environmental conditions without degradation. UL 746C is an international standard that focuses on evaluating the performance of polymeric (plastic) materials used in electrical equipment under various environmental conditions.
Also certified to UL94 flammability standards, its flame-retardant molding material helps prevent both the cable from burning in 60 seconds and the dripping of flaming particles in the event of a fire.
The interconnection between copper-based string harnesses, or VOLTAGE LYNX bus trunk and combiner boxes or string inverters in a large-scale utility plant, requires a cost-effective and reliable solution. VOLTAGE group developed its VOLTAGE ALEX series aluminum extension system, as aluminum is a cheap alternative to copper. Inferring from the datasheet, we can say that its connecting joints, a transitional point between copper and aluminum wire (Cu-Al), feature anti-oxidation or anti-corrosion joint compounds. The company states that the inclusion of these compounds prevents the potential risk of surface oxidation of the 2 dissimilar metals. This product’s Cu-Al joint is rated for up to 35 kV system voltage. The peripheral mold of this aluminum extension has weather-resistant and flame-retardant properties. Similar to the VOLTAGE LYNX bus trunk system, it is certified according to the UL746C standard.
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