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Why would my 120 converter not keep my batteries charged while plugged in?

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  • Cars & Trucks Master
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If you are referring to a 12V DC - to -120V AC converter, then the answer is obvious. The converter makes the AC from the DC voltage provided by the batteries. You cannot charge a DC battery with an AC source. Additionally, even if you could, the resulting charge would be less than the draw taken from the battery (physics - loss from heat). Also, there wouldn't be enough power left over to do anything with.

Posted on Nov 23, 2014

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