Calculating power draw for macbook pro laptop

If you’ve got USB sockets in your MH, as we have in ours, can’t you just plug directly into one of those, they provide 5 volts. We plug our pads and phones into ours and don’t bother with the supplied 240 volt charger / transformers,  which will of course require an EHU hook up or inverter. If you don’t have any USB sockets on your 12 volt system, you can get adapters that plug into the 12 volt sockets.

The user and all related content has been Deleted User

As DD states, you will be better using an EHU or a quality, adequately rated Inverter powered from your leisure battery. Forget all of the ‘Output’ figures, they relate to the rating of the laptop charger  The important figures are the 240V 2A input requirements. The 2A relates to the rating of the 240V supply. There will be an inrush or switch-on current that will quickly decay once the charger is running. Hence the need for a 2A supply so  the supply fuse does not rupture on switch-on. The charger will draw nothing like 2 Amps when running.  I think you are worrying too much and trying to read too much into the rating plate on the charger. Relax and have a good Christmas and a happy New Year.

I use a 12V adapter to power my MacBook Pro (2013). It will be a bit kinder to your battery than an inverter. I'd not recommend an inverter with a lead acid battery anyway. Low power inverter requirements are generally better served by a 12V adapter. High power ones  for microwaves etc. really require a decent sized lithium to cope with the demands.