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Probably the simplest most efficient solution would be to use a DC-DC converter/regulator of some sort. In my personal experience for other similar projects I have found that buck converters are probably your most reliable solution where you will probably be getting approximately 95% efficiency stepping up the voltage from 12 to 18V (Probably more efficient than your AC charger). One thing I would recommend however is that if you are buying a cheap buck converter (off ebay perhaps) that you ensure that you either connect the outputs up to an oscilloscope to check for any large high frequency components to the output. If you don't have access to an oscilloscope I would recommend you also buy a fairly large electrolytic capacitor say ~200uF and put this in parallel between the positive and negative terminal, this should filter out most damaging high frequency DC voltage spike. Another thing to keep in mind is the power rating of the buck converter. Make sure its going to be able to power your laptop.
How about 12v battery Plus + 6v battery and connect them so they make 18v current , I'm not really good in electricity and I want to ask about the amperage , what if my battery is 60AH can I use transformer to step up the voltage to 18 V or 14 V
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Posted:Mar 17, 2009
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