Photovoltaics

Photovoltaic (PV) panels convert light into direct current (DC). The DC electricity flows through DC cables and MC4 connectors to the inverter, where it is converted into alternating current (AC) to power the load or feed into the grid via AC cables.

In a system with storage, the battery/BESS receives and discharges electricity via DC cables, while signal cables—or buses—enable devices to exchange data. Cables and connectors are the components that conduct electricity and transmit signals throughout the system: selecting the wrong type or making poor connections can cause voltage drops, cable overheating, and a reduction in the system’s lifespan.

Yes. HELU Vietnam provides both electrical connection technology and storage solutions for solar power systems:

• Electrical connection technology: SOLARFLEX® DC cables, AC cables (NYY series), N2XSEY medium-voltage cables, RS485 cables and communication bus cables, MC4 connectors, cable lugs, and UV-resistant corrugated tubing.
• Energy storage systems (solar panels, storage batteries, inverters, and BESS, etc.) for residential, commercial and industrial (C&I), and utility-scale applications .

Because the cable is installed outdoors, where it is continuously exposed to sunlight for many years and may come into contact with acids, alkalis, moisture, or be chewed by rodents, the jacket must withstand all of these factors to ensure long-term durability.

Used to connect large-scale solar power plants to substations or the power grid; they are typically installed underground from the solar panel area to the interconnection substation.

MC4 connector provides a safe, waterproof, and stable DC current connection for solar panel modules, reducing the risk of electrical leaks at outdoor connection points.

Yes. Aluminum cables are lighter and more cost-effective than copper cables for large-scale solar farm projects, provided that the cross-sectional area is properly calculated to accommodate the load and transmission distance.

RS485 cables are used for data transmission, not power transmission: they connect inverters to data loggers, electricity meters, sensors, and monitoring systems to track output and provide remote fault alerts. It is recommended to choose cables with shielding and to route them separately from power cables to ensure stable signal transmission.

The DC circuit of a BESS storage system typically carries high currents in both directions (charging/discharging), so it requires DC cables with the correct cross-sectional area, good heat-resistant insulation, and secure connectors; additional signal cables are needed for communication between the battery management system (BMS) and the inverter. Specific specifications should follow the recommendations of the BESS/inverter manufacturer and the calculations of the design firm.

Cables used for floating solar (floating PV) systems are exposed to high humidity, constant UV radiation, and slight movement caused by waves and water levels; therefore, they require a weather-resistant, moisture-proof cable jacket that is sufficiently flexible at points of movement. Since each project has different conditions, please consult with HELU’s technical team at +84 28 77755578 or info@helukabel.com.vn to select the appropriate solution.