The new 'advanced' version of the sodium-sulfur (NAS) battery, first commercialised by Japanese industrial ceramics company NGK more than 20 years ago, offers a 20% lower cost of ownership compared to previous models, according to the company and its partner BASF Stationary Energy.
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This guide highlights five top options that balance capacity, weight, safety, and longevity. Each entry aligns with common 12V 20Ah needs—whether you prefer sealed AGM for maintenance-free use or lightweight LiFePO4 for longer life and safer handling.
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Quick answer: Add up your daily watt-hours, double the figure for wiggle room, divide by 12 to get amp-hours, then double again if you plan to use only half the battery. That's the minimum size your 12V inverter deserves.
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Perform equalization charging every three to six months to restore balance among batteries. This process helps maintain battery health and efficiency.
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