MrWizard wrote:
Your 12v to 19v booster is still an inverter, just named something different
You have to cycle that DC to feed the transformer to raise the voltage
The difference being the output is regulated DC instead of regulated AC
You do skip one conversion stage so it is slightly more efficient
You only convert Up one time instead of up to 120 and then back down to 19
You ARE correct, a laptop 12V power supply TECHNICALLY consists of a switching power supply. BUT it differs slightly that it is designed to operate at 12V on the input..
Typically switching power supplies top out at about 92% conversion efficiency but most are in the 80%-90% range..
So, running TWO inverters you are adding an extra 10%-20% "overhead" in losses.. Doesn't sound like much BUT.. it is.
For example, a laptop uses 60W from the internal battery.. Plug in the power supply loss of say 10% you are now drawing 66W.
Now plug that into a inverter with say 10% loss that 66W is now 72.6W..
That is now a penalty of an additional 6.6W and all told 12.6W "overhead" which is burned up in heat..
But hey, you ARE welcome to do it your way..
