Victron Multiplus Recommended DC Battery Cable Size in mm2

The Victron MultiPlus range encompasses a versatile lineup of inverter/chargers designed to meet a wide array of power requirements, from small-scale residential setups to more demanding commercial applications. A critical aspect of installing a Victron MultiPlus system is selecting the appropriate DC cable size to ensure safety, efficiency, and reliability. The recommended DC cable size varies significantly across the MultiPlus range, influenced by factors such as the inverter's power capacity, maximum current draw, and the length and conditions of the cable run.

Key Points on DC Cable Size Recommendations:

• Cable Size Variation: The recommended DC cable sizes for the Victron MultiPlus series range from as small as 6mm² for lower capacity models (500VA - 800VA) to as large as 140mm² for the higher capacity models (up to 15000VA), depending on the specific requirements of each model.
• Influencing Factors: The optimal cable size is determined not just by the inverter's capacity but also by the maximum current draw, the total length of the cable run (to minimize voltage drop), and the allowable voltage drop in the system. Environmental factors such as ambient temperature and installation conditions (e.g., in conduit or free air, and whether cables are bundled) also play a crucial role.
• Safety and Efficiency: Proper cable sizing is essential for preventing overheating, ensuring efficient operation, and avoiding unnecessary power losses. It also plays a critical role in safeguarding the system against potential electrical hazards.
• Consultation and Manuals: Victron Energy provides detailed installation manuals for each MultiPlus model, offering specific recommendations for DC cable sizes. These manuals are the primary resource for ensuring that installations meet Victron's safety and performance standards.
• Professional Guidance Recommended: Given the complexity and importance of correct cable sizing, consulting with a professional electrician or a Victron dealer/installer is highly recommended. They can offer tailored advice based on the unique aspects of each installation, including specific model requirements, installation environment, and local regulations.

In summary, selecting the right DC cable size for a Victron MultiPlus installation is a nuanced process that requires careful consideration of the inverter's specifications, installation conditions, and safety standards. By adhering to Victron's recommendations and seeking professional advice when necessary, installers can ensure that their systems operate safely, efficiently, and reliably over the long term.

Van Junkies have put together a useful Victron Multiplus DC Cable Sizing Chart here.