Check your batteries with a hydrometer. It sounds to me like you might have a shorted out cell on one of the batteries and the charger just keeps charging at a high rate and is evaporating the water.
Definitely something wrong, it shouldn't boil the water out that soon.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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