Re: Electronical question
- From: Don Foreman <dforeman@xxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 27 Sep 2008 07:18:32 -0500
On Fri, 26 Sep 2008 22:25:42 -0500, "Martin H. Eastburn"
<lionslair@xxxxxxxxxxxxxxxx> wrote:
Steve what are you trying to do ?
It sounds like you bought a 12V to 110V inverter power supply.
Being square wave isn't all that good for laptops. It is hard on
transformers. Sine wave is preferred for transformers and 60 cycle regulated.
The square wave type are good for lamps and resistive loads.
If one considers a 100% efficiency box, then 400 / 12 = 33 amps and
the square nature is likely to draw more on the edge currents.
A 40 amp slow blow circuit breaker would be ok.
Resistive load is coffee pot / lamp / toaster - but only lights are
low enough in current to be used. 400 watts is small.
This will NOT work for a laptop in the truck. You need a sine wave unit.
This runs camp lights, Can't run much else.
Martin
If the laptop power supply says that it'll accept 110 to 240 VAC (or
something like that, as many do), then its power supply is a
"switcher". These immediately rectify the incoming power to DC so
waveform (sine, square or whatever) is irrelevant to them. As someone
else noted, the resulting DC is then chopped and transformed at high
frequency for economy and compactness.
.
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