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1 REPLY 1
04-26-2023 11:06 PM
HP Recommended
the best/easiest solution is to use a "QUALITY" inverter around 150 watts continuous or greater capacity
note that most cheaper inverters are not true sine wave, but a chopped square wave output which some electronic equipment will not tolerate
in your case the t640 uses a external 120v to 19.5 volt DC 3.5 amp power supply that will work with a square wave type inverter
https://www.amazon.com/BESTEK-300W-Power-Inverter-Adapter/dp/B004MDXS0U
there are also DC to DC inverters that replace the computer's power supply
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my testing
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