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neb

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  #1734284 10-Mar-2017 10:56
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You can also do this with a Zojirushi water heater, you get the water up to temp on mains power, than use batteries to keep it at temp. It's a triple thermos so you need very little power input to maintain it at 90 degrees, mine's rated for 17W power use. Downside is that you can't buy them in NZ, you'd need to import one from Japan.

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  #1734303 10-Mar-2017 11:33
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sbiddle:

 

Trying to use a DC power source and inverter to boil water is about the most inefficient use of energy there is.

 

 

Possibly second only to trying to get a straight answer out of a government department.


 
 
 
 




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  #1734336 10-Mar-2017 12:11
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Thanks for your responses. It appears at this stage that generally-accessible technology is not available for a fully-powered portable AC. Technology is not as advanced as I thought. I'm sure in the future it will, that they'll find a way to store more power in a possibly yet-to-be-invented power storage unit. The other angle would be to find a miraculous way to boil water with little power. Then you could have a USB-powered jug you could plug into your portable laptop. :)


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  #1734340 10-Mar-2017 12:21
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If you shift to the top of Everest the boiling point of water drops to 72°C but that's not the miracle you're looking for.

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  #1734341 10-Mar-2017 12:24
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Get a bell jar and a vacuum pump. Remove all air and the water will boil at room temperature. 

 

 

 

 





I don't think there is ever a bad time to talk about how absurd war is, how old men make decisions and young people die. - George Clooney
 


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  #1734369 10-Mar-2017 13:25
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Electrolyse some of the water into hydrogen and oxygen, use the resulting gas mixture to boil the remaining water.


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  #1734386 10-Mar-2017 13:59
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RustyViewer:

 

Thanks for your responses. It appears at this stage that generally-accessible technology is not available for a fully-powered portable AC. Technology is not as advanced as I thought. I'm sure in the future it will, that they'll find a way to store more power in a possibly yet-to-be-invented power storage unit. The other angle would be to find a miraculous way to boil water with little power. Then you could have a USB-powered jug you could plug into your portable laptop. :)

 

 

 

 

Ehhh it's not so much advancement of technology preventing something that matches your request, than it is basic physics. Water has a huge heat capacity - highest of all common substances. To boil 1 litre of water from room temperature takes the same amount of energy required to run a light bulb for almost 5 hours.

 

That's just 1 litre. You'll need dozens or hundreds of litres for a cafe for a day. There's also the energy lost in the inverter to convert from DC to AC. There's a good reason why the hot water cylinder is the biggest power consumer in a house.

 

You can't fight physics... just use a gas stove.

 

 


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