Join Date: Aug 2006
Location: Arlington, VA
Thanked 11 Times in 9 Posts
Rep Power: 11
Virtually any inverter can be made to work the way you want.
However, it's a lot of work and, with respect, from your posts it's clear that your understanding of AC/DC is a bit wanting.
My question: Why do this? As mitiempo and others have said, both the laptop and the cellphone can be made to work directly from 12VDC (the batteries) with appropriate "car adapters". It these are truly the only things you want to charge, then do yourself a favor and get an adapter for each and keep things simple.