(1 November 2013, 21:47)River Song Wrote: I don't need a 1kW inverter to charge a USB phone. My 150W one will do that thanks..
If you're using USB it's limited to 5V at 1A (5W) and it's waseful to convert 12V d.c. to 230V a.c. just to convert it back to 5V d.c.
(1 November 2013, 21:47)River Song Wrote: What is the point in purchasing a 1KW inverter if you can't use it?
A 1kW inverter is useful for some loads (such as motors) that have a very large starting surge. It is also useful in cases where you have many batteries wired in parallel.
The "cigarette lighter" output on a car is usually limited to 10A @ 12V = 120W
Most batteries Ah rating is based on a discharge over 20 hours. So your 125Ah is implying 6.25A for 20 hours to totally discharge your battery (which will ruin it). Taking it down to 75% charged means you can draw 6.25A for 5 hours.
You should be thinking more along the lines of
6.25A @ 12V = 75W for 5 hours
or
10A @ 12V = 120W for ~3 hours
You can certainly run your hair dryer from this (I'd like to think you can dry your hair in a few minutes) but the cooling device for the Harveys Bristol Cream is more of a problem as it needs to run about 8 hours a day.
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