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+1 Simon is on the money with the correct figures, it's nothing to do with manufacturers being devious, Solar panel power has always been calculated at the point of maximum output, not at 12 volts. My 85 watt panels average around 4.5 amps each in to my batteries. A rough guide is to simply divide the rating by 18 to get the current available for charging from the panel.
Another thing you need to consider is the amount of sunlight hours available over the day, not sure what you could expect in Qld but in Summer in Tassie I get around 60 amp hours per day from 170 watts of panels, that equates to 6-7 peak hours of sun per day.
Last edited by acropolite; 24-06-2012 at 08:40 PM.
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