Stalwart 12V Heated Car Blanket - Electric Warming Throw for Cars, Trucks, SUVs & RVs - Portable Travel Blanket for Winter Camping & Road Trips - Cozy Black Plaid Design

Picked this up ahead of a late fall overlanding/car camping trip with expected night time temperature around 32F.While I do have a 0F sleeping bag, we know those ratings are closer to absolute limit and not necessarily “comfort” temp. Sleeping bags will also take awhile to warm up with body heat, and any wind drafts/gaps will quickly become uncomfortable (especially the darkest hours around 5-6am).This was so cheap, it was a no brainer to give it a shot. I figured I can use this as a sleeping bag liner of sorts, and/or a blanket layering system when it’s not as cold.I’ve only tested it out at home thus far, but I’m very satisfied with it. The trick is to use a layer system just like dressing for the cold; Put another layer on top of this heating blanket and you’ll be so toasty. Yes, you can feel the wires inside the fairly soft fabric if you’re feeling around for them, but not when it’s just on you.The amp / wattage draw is very reasonable at ~3.42 amp / 41watt. It can easily be powered by a 250watt portable power station for 6 hours, which should be enough for what I need. It heats up within a few minutes too! Most vehicles will have ~600watt battery, but you should not discharge more than ~40% to make sure you can still have enough voltage to start the car. Simple math means you’ll have about 240watts, and should not plug into a vehicle’s starter battery for more than 6 hours if it’s not running.As others have said, no on/off switch or temperature adjustment, but it’s easy enough to wire a switch myself, so I’ll be doing that.On a slightly side note, I’d recommend car campers/overlander to pick up a 500watt+ power station and charge the power station throughout the day with the vehicle running or solar.