Quote:
Originally Posted by martyh
I'm not sure what the circuit is ,i have a suspicion it is fed by a separate connection on one of the 12v batteries as there is a separate cable coming off one battery that is not present on the other .There is only the internal lighting and the power supply that is 12V all the external lighting/ignition etc is 24V.The Hella socket (24V) is what would normally be used for running high power items such as TV's,kettles,fridges and microwaves but i would not have thought that charging a laptop would require that much power
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No but to start the inverter might take more power (even with no load)
Also remember that the laptop PSU might be rated at a a couple of amps, take into account that you are converting from DC to AC then back to DC with an efficiency of about 70-80% and the amerage conversion means that the current draw (even with just 1amp on the PSU) may be in the region a few times that on the 12v, most car DC 12v sockets are only rated at 8-10amps with a lot rated a lot lower