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Old 30-04-2011, 12:58 PM
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jenchris (Jennifer)
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Join Date: Nov 2010
Location: Ormeau Gold Coast
Posts: 2,067
What's the wattage on the dew heater?
If you have a deep cycle battery, it need be no more than 18a/h I'd say, but if the dew heater is a whopper, it'll be touch and go.

P= IxV - so you've got 18 x 12 = 216watts for an hour, or 113 watts for two hours or 56 watts for four hours
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