Do you guys think this will work out from 400W power outlet located in back
Norpro 559 Electric Immersion Heater Warmer 300W For Water Tea Coffee Soup

Thanks

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Probably not. Look for a 12v one

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I've actually been looking at getting one of those myself. I don't see why it wouldn't work, pulls less than 400w

I have the 110V one and the 12V one.
The 12V is way less wattage (around 120W) and takes way longer to heat water.
The 110V one should be fine at 300W on a 400W inverter.

300 Watts will heat up 2 gallons from 60-120 in an hour with no thermal losses. What are you going to use it for?

The problem is that you can only pull 300W from the inverter when the vehicle isn't running. While it's running, that outlet is clamped down to 100W. 300W is a battery drainer, and could leave you in a no-start condition in relatively short order (depending on the capacity and condition of your battery).

If this is for small volume consumption or just to take the edge off a jug of cold water for handwash or shower, then its significantly faster and more efficient to just use something like a gas operated Jetboil unit.

If you want to use something like this, regardless of if its inverted DC-AC to direct DC, you are going to need to improve the electrical in the truck, both with an additional battery and or a more capable inverter.

I was going boil some water while camping, got to kids they are not used to cold water

get a jetboil, you can have boiling water in a little over a minute

Boil water for a shower or for consumption.

If it's for a shower - I wouldn't even consider this. The thermal loss from the water container will exceed the ability to warm it very much so you probably won't ever get a hot shower. In that case I'd either get a propane camp shower setup or heat up water on a camp stove. I use a solar shower or a cold shower. The old bushranger water heaters supposedly worked pretty good (they use the heater circuit fluid through a heat exchanger to warm up water).

If it's for food consumption - I'd still get a jeboil.

I have this cheapo kit. $25 plus a can of fuel for another $5ish. Lives in my 4Runner. I use it frequently and it works great. Amazon.com : AnimaMiracle 18 Pcs Camping Cookware Set Hiking Camping Backpacking Gear & Camping Outdoors Survival Utensils Cooking Equipment Cooking pots Mini pan, Lightweight, Camping Mess kit With Fire Starter : Sports & Outdoors

If you're just heating up a small amount of water a little bit - I guess that might work.

It's cheap, buy one and try it at home.

IMO - The 120v unit should work fine. Engine running, shift in park. It will take 2.5 amps from the inverter and the inverter will take 25 amps from the T4. The inverter is on a 40 amp line and fuse.

I expect the alternator will keep up and the battery will not be discharged. If concerned, run it for another minute after the heater is finished.