wiring constant power to relay for

Hey I want to add a 2nd power outlet in my car and wire them to constant power. I am not sure if I should wire a relay to do this? I was thinking of wiring it 86 and jumping it to 30 to the ign harness constant wire, 85 to chassis ground and 87 to both cig pos wires. Now I heard a relay powering something 24/7 can drain a battery...but what if it's just energized, with nothing connected to either cig port at night to draw any power? I'm trying to use a plug in power inverter for 2 laptops chargers without needing to turn the ignition at all. And i don't want to blow any fuses. Is it safer if I just run a 12ga fused wire to both cig wires from the constant ign harness wire in the car? If so would a 20a fuse be too much?

Or I have a switch from a remote start...its rated for 6amps is this strong enough to turn the relay on and not burn out if activated from the ignition harness to the relay coil?

If you have nothing connected to the power outlet then there is no drain.
You only use a relay if you want to switch the feed on or off - ie, to ensure things are off when not charging or with IGN or ACC or manual switch off etc.

No relay but keep the 20 amp fuse.
Suggest you only use it to charge the laptops when the engine is running.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Added note - tho the Euro aka Merit etc sockets are rated for 20A (and AFAIK will handle that), traditional cig sockets are only rated for up to 15A - and many won't handle more than a few Amps.

12V fridge manufacturer Engel use 10A thermal fuses in their cig plugs - even for fridges with a max draw of 2.5A. Isn't that nice - an accessories manufacturer that provides safety protection for a fault that is not theirs. I can only assume they have a great community concern, or they found the thermal fuse was cheaper than being blamed for flamed cars & campers.

Thanks guys I ran a fuse it seems to be working great!