Yes, you can connect an inverter to a lithium battery. Lithium batteries, particularly Lithium Iron Phosphate (LiFePO4) batteries, are well-suited for use with inverters due to their high efficiency, lightweight design, and ability to deliver consistent power.
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Why they still exist: They're cheap, simple, and familiar. In 2025, they're used mainly for budget solar installations or backup-only systems—not for mission-critical or mobile systems.
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Their feasibility for microgrids is investigated in terms of cost, technical benefits, cycle life, ease of deployment, energy and power density, cycle life, and operational constraints.
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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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