> The original url showed a 12V to 240V converter.
The conversation had moved to a PSU that has dual 240VAC or 12VDC inputs.
The claim was that the 12V input is more efficient. It is not.
> It's most likely that the USB output is single conversion, but a laptop
> or similar would need powering via the 240V
Not so. This is why I mentioned the 12VDC in laptop supply I was using at
the time of my posting.
> So at that rate you'll use half your car's battery capacity in a little
> under 3 hours, and you really don't want to take a car battery much
> below that.
It gets worse than that if you start drawing serious power. A typical
automotive alternator will develop something in the region of 100A max. My
large inverter draws >150A...
Vic.
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