I'm looking at running/charging a Dell laptop within my vehicle from an
auxilliary battery. The ouput of the existing mains charger is 19.5V at
3.34A, so say 70W.
Does anyone have experience with the 150 watt (round, $50) Jaycar devices or
with the larger rectangular 150watt models? Is the modified sine wave
output likely to be an issue for the Dell Charger?
dave
I have a 150w model for a few years (not jaycar), it works fine with
my Toshiba Laptop which has similar wattage rating to what you have
quoted here.
Only thing i have noticed is that the laptop takes noticeably longer
to charge compared to when powered off a domestic mains supply, but i
havent studied this in great detail. Also, even though the laptop is
only using about half of the wattage rating, I find that it wont
effectively run some items like 20w plugpack etc at the same time. (IE
plugpack powered mobile hard drive refused to work).
If you need to run other devices, it might be worth investing in a
higher rated inverter, though if you were to go above about 150w, you
would need a built-in unit with direct connection to the vehicle
battery as 15 A is the maximum you can draw from a typical cigarette
lighter socket,
Note that at the full 15A load, you are likely to have significant
voltage drops by the time the 12v makes it to the inverter - that are
going to reduce the available output even more.
Note that some devices (such as modern cordless drill battery chargers
that have a series capacitor with the mains rather than a transformer)
dont work properly unless you use a sinewave inverter to power them.
---------------------------
I don't like some of those aftermarket DC power supplies after I had a
bad experience with one some years back that zapped a digital camera
on me.
The other problem with them is that many laptops use a different DC
connector, possibly different polarity and different DC voltage to
boot. This is only going to be a pain in the arse as you will
probably have to replace the adaptor every time you upgrade the
laptop. Also, unlike an inverter, you cant use it to power other
devices