A 12V system is typically suitable for smaller solar setups and applications with lower power requirements. They require less current to transport the same amount of power, reducing energy loss over longer distances. As an Amazon Associate, we may earn from qualifying purchases at no extra cost to you. 12V vs 24V Solar Systems: Choosing the right solar. . When building an off-grid solar system, choosing between 12V, 24V, and 48V isn't just a technical detail — it shapes how efficient, cost-effective, and compatible your system will be. It's easy to wire, uses widely. . A critical decision you'll face is whether to use a 12V or 24V system.