How Long Does a 12V Battery Last with a 300W Inverter?
Learn how to calculate the runtime of a 12V battery powering a 300W inverter, factoring in amp-hours and efficiency.
Video transcript
To determine how long a 12V battery will last with a 300W inverter, you need to consider the battery's amp-hour (Ah) rating. For example, a 100Ah 12V battery can theoretically deliver 12V * 100Ah = 1200 watt-hours. A 300W inverter will use 300 watt-hours per hour. Thus, 1200 watt-hours / 300 watts = approximately 4 hours. However, actual performance may vary due to efficiency losses and battery health.
Questions and answers
How do I calculate the battery runtime for an inverter?
To calculate battery runtime, multiply the battery's voltage by its amp-hour rating to get watt-hours, then divide watt-hours by the inverter's wattage rating.
Does inverter efficiency affect battery life?
Yes, inverter efficiency impacts battery life as some energy is lost during power conversion, reducing the actual runtime.
Can a 100Ah 12V battery power a 300W inverter all day?
Theoretically, a 100Ah 12V battery can power a 300W inverter for about 4 hours; powering it all day would require larger capacity or multiple batteries.
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