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Blimey, your laptop draws lot of current so I suppose it is not going to work well, to higher risk of overheating. My and my wifes laptop only draw 3.3A.
The PSU(Power Supply Unit) primary design suggests a laptop but like any PSU it will work on anything else. I sell these as I have a whoesale account with Jaycars supplier for a number of Grey Nomad that need assistance with listening system while travelling.
It can be used for anything that has a DC power input as long as it can handle the current.
I think your only alternative is a DC-DC inverter. I am preparing my car with 80AH sealed LA batteries with a 750W inverter to supply other item. I would still use the laptop PSU to supply the laptop as the efficiency will be better.
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