Inverters.

You should be fine but I would start your truck every few hrs to keep the battery charged.

 

You can't really draw more than about 300 watts, without risking blowing the fuse to the cigarette lighter, anyhow. The chatter, here, is generally accurate; you can easily get through a ten-hour break without needing to start the truck - as long as you aren't also draining the battery with your headlights, or some other electrical heavy-lifting. Your television is unlikely to draw much more than about 50 watts, and the firestick is going to be too low of a draw, to even measure. I wouldn't do a 34-hour restart, without starting the truck up, and letting the batteries recharge for a bit, but even a 16-hour break should be fine. In cold weather, you should probably idle, just to keep yourself warm, and keep the truck from having problems like fuel gelling, or the electrolyte in the batteries, freezing - but those are separate issues from running down the batteries. If they die that quickly, under a load that size, then you had at least one bad cell, or other electrical problem, to begin with - not your fault.

If you are seriously concerned, they sell jumpstarter gizmos at Walmart (and any place that sells auto parts) which have inverters built in, and attached to their own batteries. You can hook up your inverter, use it to charge up the jumpstarter while you are driving, unhook it from the truck when you shut down, and use the jumpstarter to power your television and firestick while shut down - and then you aren't even touching the truck battery while shut down. The jumpstarter battery has less capacity than the truck batteries, but it should be adequate to your needs - and if it isn't, start the truck up, plug it in to your inverter, and recharge it. No big deal, and no risk. They are bulky gizmos, and heavy, so I wouldn't recommend it for slip-seat drivers, but if you're OTR, you won't be moving your crap out of your truck all that often...

 

Why are so many companies so terrible to their employees? Would they shut off the heat or a/c at the office? Hell no. Everybody would walk out. Why treat the people making you money worse than you're allowed to treat animals?

 

Well... for money... and because the driver cannot in all practicality, walk out. And can't get to you, to complain, or even really identify who is responsible for the policy that treats the driver worse than the dog in a car in the parking lot. We get treated this way because there is very little that we can really do about it, and that is telling, about what the people that we work for, think of us, and other human beings in general.

The sad thing is that they don't generally think any better of their employees, in other industries; they are merely more directly and immediately faced with consequences, for treating their employees this poorly - so they don't, for fear of the consequences. It would be better, if they had higher morivations, but they don't, as evidenced by the way that things work in our industry. Keep this in mind, as the role of driver gets automated away. People are full of words, to describe how noble and pure their motivations are, when they try to "help" you. "We created this technology to make your job easier, and keep you safer!". Even if it accomplishes that (and it rarely does), it's a side-effect; a manipulation , a 'spin', or a marketing strategy - not the intended purpose.

Any time that someone tries to tell you that they are changing something for your own good, get very, very suspicious. That is almost never the reason why they are doing it, and if you didn’t have some recourse against it, they wouldn't even bother trying to placate you with that story.

 

You can not draw 300W from the 12V outlet.
Any inverter out there will max out at around 150W when plugged in to the 12V outlet.
A direct connection to the battery with the proper cables is necessary for the full wattage to be available.

 

Because drivers allow it.