12v Cigarette lighter outlet - # of plug ins?

[BMWManiac]

I have the cup holder with the cigarette lighter port.....I was wondering how many different plugs can you put into an adapter before you either 1) cause a fire, or 2) blow the fuse!

I've seen some with up to 4 x outlets! Reason being, for me, I need to power:

1) Seat heater (Okeale seat covers)
2) Navigation/phone
3) Passenger phone?

I guess I don't need everything plugged in at once, but more or less wanted to ask out of curiousity

[StereoInstaller1]

If you want to be safe, simply add fuse vales and don't exceed 75%ish of the fuse value of the circuit you are using.

So if your Nav has a 3A fuse and you passengers phone has a 3A, those seat herters could have a 10A and you would still be fine.

Make sense?

HTH
Luke