Monday, Aug 29, 2011 at 17:55
I have, for the last 15 years of owning a Trailblazer fridge, thought 3 days before charging in cool (anything with a max of less than 30 deg) weather was very attainable with around a 100 a/h deep cycle battery.
After 3 days I would then run the engine on about 1200 revs for an hour a day or so with the start battery negative terminal disconnected. That way all the charge goes into the second battery. But I wouldn't even consider that for the first couple of days.
If was driving for a couple of hours or more every second day I would have plenty of charge for camping.
Trailblazer don't recommend that you run their fridges from a generator but recommend you run them from a battery & use the generator to charge the battery. This is because trailblazers have a 20% duty cycle at an ambient air temp of 45 deg.
I have never felt the need to carry a second generator to charge a battery when I have an 80 amp alternator or greater sitting under the bonnet already hooked up to a 130kw motor with a 75 l fuel tank.
I reckon if you can't get 3 days you gotta get better gear.
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