laptop

He is saying that the laptop goes off when he starts the car,
The laptop would not have a dead battery if the laptop is already on and running and then it goes off when the car starts.
Cheers

Install a separate power outlet for the computer.

PeterD

My laptop battery has been passed away for a number of years now.

Also had the same problem as George when I was still driving the G60.

I started running my lappy from the inverter but have cooked a capacitor in the inverter, twice. Think inverter does not have enough watts..(what???)

Then hardwired a Kerio DC charger to auxilliary battery and no worries from then onwards.

I'll 2nd that as the most logical and sensible answer given

This is what I used to do when installing GPS' in our work cars, otherwise everytime the cars were started the GPS would shut off.

Mainey,

I'm not convinced that will solve George's problem.

Regardless of whether the Laptop is running off an Inverter or not, the interruption to the power supply will still happen and if the Laptop's internal battery is flat or non-existent, the Laptop will still "die".

I don't recall Inverter's having a "back up" power supply like a UPS does.

I have problems with my inverter sensing low power and shutting down when the vehicle is turned off. doesnt have this problem with it connected direct to the battery.
One of these days I will get time to hook up power direct from the battery with enough plugs for all the equyipment you "have" to have these days

George's problem is stated as ""when I go to engage the key to start the vehicle, the power cuts off from the laptop - causing the laptop to shut down, ..... I have it plugged into the 12v socket for its power supply ""

This indicates to me, the computer battery is not running the computer independently, and also the Cranking battery looses voltage when it cranks the engine, which is normal.

However the Aux battery is not affected by the loss of voltage of the Cranking battery when starting
(I have to assume it's isolated by a 'good' battery isolator system)

The Inverter should always be connected to the Aux battery (via fuse) direct to the (+) and (-) terminals, and preferably a (quality) Deep Cycle battery, therefore it's fully independent and not affected by the Cranking battery voltage, either high or low.

If the Inverter is connected correctly there is no more danger from 240v while driving than while stationary.

My inverter is running at least 3 x items, 4 days a week minimum, full time, but I wired my Battery isolator, 200+ Watt Solar system, Solar Regulator, 200+ AH AGM storage Battery electrical system and Inverter myself, so I know it's as safe as the ADR's require it to be.
It's used 24/7 running Fridge Freezer, Inverter and lights etc.

and why is that?

and why is that?

There is nothing wrong with operating 240 V in a moving vehicle. The big question is whether the installation is safe or not - exactly the same problem as operating it at home.

In selecting an inverter, make sure the output is isolated from the input. (This applies for any application.) You can simply check this with a multimeter on the ohms range. Connect the power supply directly to the 240V output socket on the inverter - do not attempt any external 240V wiring yourself. The 12V wiring is done like any other appliance, heavy cable protection fuses etc.

PeterD

Wouldn't like to come to the assistance of the car after an accident and get zapped by 240v