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If you look at a laptop charger, they are usually rated quite high, eg an apple magsafe charge is 160W. But this is only when recharging the laptop battery. If you plug in a fully charged laptop, the power consumption will be much less. If you plug in a laptop with a flat battery, that battery will suck the power out of your car battery.
Most mounts use around 0.2 - 1A when tracking and about 2-4A when slewing.
The HEQ5 power supply is rated at 2A so presumably it uses 2A for slew and considerably less to track.
The active cooling on astro cameras typically use lots of power, more than the drive system. Dew heaters can also chew up the power.
A standard cheap small car battery should run your HEQ5 or SW Star Aventurer, fully charged laptop and other accessories for one or possibly more nights. I use a smaller (lighter) car battery to do this so I am not lugging a big deep cycle marine battery. The marine battery will give much more power, the small battery will be easier to handle.
I can run a Takahashi EM200 (basically an EQ6) plus other accessories from a small 260CCA Supercheap Auto battery that cost around $120 has a built in handle and is pretty easy to shift into position under the scope each session. I don't power my laptop and I run sky safari off an ipad and a skyfi. One charge of the car battery lasts at least 2 nights.
A deep cycle marine battery will run your setup for a week but will be very heavy to move around. You have to choose what's right for you.
Joe
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