Power supply notebook in the car?

I need a power supply for my notebook in my car. I would like to charge this with the original power supply unit on the cigarette lighter. So with an inverter. There are many different models here. What kind of notebook should you buy? Real sine e.g. Directly costs 30 euro more, etc. Can someone plausibly explain what is recommended?

There are also car chargers for laptops

I'm just a little scared because my notebook was very expensive. Unfortunately, these devices are not available from the manufacturer. Do you think that is safe?

Mine is from HP and has been charging the laptop for 3.5 years without the thing flaring. The charging electronics are built into the device anyway and not into the charging cable

Have a look at Conrad Electronics or something like that for an inverter 12V DC to 220V AC which is often already available in an aluminum housing and can be installed somewhere in the car under the seat or something then you have a socket there.

In my company car and such an inverter with 150W is enough for my company laptop + mobile phone charging cable

If you take something decent, yes

Your inverter must have at least as many watts at the output as your notebook power supply VA has.

here you have to look at the input values.

if it says that the device works at a voltage of 100 to 240 volts, and let's say it draws 2.5 amps, then that means that we have 100 volts times 2.5 amps, i.e. 250 volt amps, or VA for short. Your inverter must therefore be ready to deliver at least 250 watts. A little more would be better.

because of the whole reactive power problem and especially because of the double conversion, etc. There are enormous losses inevitable.

it would be better if you actually use a power supply that accesses the vehicle network directly.

Ansmann, a well-known manufacturer, offers good power supplies in the 75, 90 or 120 watt power classes for use directly in the car. Look for "ansmann dcps"

And then you think an inverter at a junk price would be safer? Rather not!

If the notebook is very expensive, you should use a suitable and qualitatively adapted power supply. But keep in mind that you can't simply charge the laptop while the car is stationary! When it is full, your battery will no longer necessarily be able to start! The car should then run for charging!

If the car battery does not manage to charge a laptop battery without getting down on your knees, then the car will not start before that.

I wouldn't say that because it depends on how much power the laptop uses and how long it needs. A good example is the hazard warning lights that don't have to run very long before you notice it. And it always depends on the temperatures. Radio operators know that:-)

You can charge and hang a laptop for hours. (As a field worker you have your experience) you can also run a dashcam, e.g. Over the weekend, without problems and leave a cell phone plugged in in the car.

The sales representative usually has a diesel:-) And if it's an expensive laptop that needs 2 A at 20V, you can pull out your 4A with power loss. If you only have a small vehicle, including a petrol engine, 4A over 3 hours are not completely without it when it is around zero degrees outside. But he will notice that when he has a battery that is no longer so new. For me, three and a half amps were enough for three quarters of an hour in the Polo. The battery was no longer the best, but it always pulled through cleanly and the starter was also not audibly lame… But after three quarters of an hour in the state, the cardboard nose came on it.

Unfortunately, the questioner did not write anything about the vehicle and the battery… And with a diesel that has a relatively new battery (field service vehicles are usually everything, but not old:-)) this is certainly not a problem. But if he drives an older, private pickle, things can get interesting.