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Old 03-20-2015, 07:40 AM   #11
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I saw a neat gizmo in Kmart yesterday - a box that plugs into a cigarette lighter socket that purports to heat and cool. It called itself a traveler 3. Probably worthy of further investigation.
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Old 03-20-2015, 09:52 AM   #12
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I saw a neat gizmo in Kmart yesterday - a box that plugs into a cigarette lighter socket that purports to heat and cool. It called itself a traveler 3. Probably worthy of further investigation.
just remember the basic rules:

heat takes energy, watts are "heat"

so if it is plugged into 12v circuit, at say typical vehicle with a 10 amp fuse

using 8amp as safe that is only a 96-ish watt heat source, wont do much

it will heat tho

most of those are gimmicks, you can run a dedicated 12v line with fuse to power a 800 watt inverter, then you can use a small (less than 800wt) heater, still small tho

I have been using $99 cobra 2000wt invertors for 5+ years (truly only about 300 hrs a year guessing) never an issue, I have them sized at 1750watts which gives me a nominal 14 amps of power, they can surge to 2500wt for compressor kick ones
remember to size it to about 85% of your needs and you'll be good

we have them in every vehicle, hair driers, irons and crockpots are big users

look at your stuff "that makes heat" it will have a wattage on it, take that number and divide it by 120v and you can see what you need
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Old 03-20-2015, 10:13 AM   #13
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I just read a review of that traveller 3. Apparently it works but flattens batteries. Must be a power hog.
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Old 03-20-2015, 01:39 PM   #14
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If you want a 12V off-the-shelf heater the best units are the ones made to address "cold cabs" for the folks driving box trucks and older cars with bad heaters. They're self-contained ceramic heater units and cost around $50 on eBay. They're fused for higher power output and you can use an adapter or wire them directly:

Ceramic Heater Fan Portable 12V Hook Up Swivel Base Car Auto Truck Cold Garage | eBay

As noted above, there's a linear relationship with electric heaters between power draw and heat output - they're just converting one to the other. If it makes you warm, it will drain your battery. If it makes you warmer, it will drain it faster.
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Old 03-20-2015, 01:49 PM   #15
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I was looking At it more as a cooler
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Old 03-20-2015, 04:53 PM   #16
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I was looking At it more as a cooler
In some cases, it takes more to cool than heat due to needing more parts to do the cooling process.

Heating is just a piece of resistance wire, and a fan.

Cooling needs all the parts in a window AC unit. That's a ton of parts = a ton of inefficiency.

Now with the introduction of variable speed DC compressor motors, the AC units are getting more efficient. However at the expense of high cost.

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Old 03-20-2015, 05:52 PM   #17
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The solid state heaters sound interesting.
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Old 03-20-2015, 09:13 PM   #18
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Err... I've been googled. Speech recognition does strange things. That should have been solid state coolers.
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