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To calculate how long a 12V 75Ah battery with a 3000w pure sine wave power inverter can drive a 40W refrigerator, first calculate the operating current of the refrigerator, and then calculate the final result according to the relevant formula.

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# How long can a 12V 75A battery with a 3000W pure sine wave power inverter drive a 40W refrigerator?

• Xindun
• December 08, 2020

To calculate how long a 12 volt 75 amp-hour battery with a 3000w pure sine wave power inverter can drive a 40 watt refrigerator, we must first calculate the operating current of the refrigerator. According to I=P/U (power grid voltage), the available refrigerator current=40W/220V≈0.2A. Power supply time=battery capacity/refrigerator current=75Ah/0.2A=375h. Multiplying 375h by the conversion efficiency of your pure sine wave inverter is the final result. If your pure sine wave inverter conversion efficiency is very low, then the power supply time will be greatly shortened. Therefore, when buying a pure sine wave inverter, you must see whether its conversion efficiency is high enough. Our suggestion is that a pure sine wave inverter with a conversion efficiency of less than 80% has no purchase value.

Xindun DP series pure sine wave inverters have low loss, high efficiency, inverter output efficiency ≥85%, stable frequency output and all-round automatic protection functions. Xindun is a formal pure sine wave inverter manufacturer engaged in the research and development, production and sales of pure sine wave inverters. It has an excellent technical team, sales team and after-sales team. Welcome to consult.

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