12 volt kettles

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captaindan

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Anyone got any advice on 12 volt kettles looking for one for the boat but when im reading up on em they are saying 18 minute to boil time. surely that cant be right the time its boiled you would have to switch it on for your next cup any recomendations would be apreciated

thanks
Dan
 
I'm surprised it only takes 18 mins - boiling water requires a lot of energy.


don't bother, use the gas hob to boil water, or get an inverter that can run a normal 240V kettle (check out your battery capacity first), at least then you can run other 240V stuff like power tools and TVs etc.
 
captaindan said:
Anyone got any advice on 12 volt kettles looking for one for the boat but when im reading up on em they are saying 18 minute to boil time. surely that cant be right the time its boiled you would have to switch it on for your next cup any recomendations would be apreciated

thanks
Dan
Click to expand...

I bought one several years ago when we used to drive through France.

Only time I used it was while waiting for a ferry.

Put it on and went for a 40 minute walk, that was in hot weather with warm water fill.

This is an option , £300 but look how happy this guy is :D
http://www.youtube.com/watch?v=vqhDhv2al38
 
DAKA said:
I bought one several years ago when we used to drive through France.

Only time I used it was while waiting for a ferry.

Put it on and went for a 40 minute walk, that was in hot weather with warm water fill.

This is an option , £300 but look how happy this guy is :D
http://www.youtube.com/watch?v=vqhDhv2al38
Click to expand...

If you look again very carefully at that YouTube promotional advert you will see that when he fills the unit and also when he pours it out, he only heats about an egg cupful (note the coffee bubble line inside the cup. This is a 'standard' sized coffee that you can expect when in Europe and not the normal ½-pint mugful (Cafe American) which most people in the UK expect.

The final stills shot from the Handpresso Company shows a coffee cup with froth about ½ full which is a bit of an admans cheeky selling and a long way short of a complete cupful. :mad:

They are probably quite useful is you just want an egg cupful of hot water? :p

.
 
Well although I posted it very much tongue in cheek , the link was sent to me about a month ago by a mate who has just bought one, he was over the moon with it, even put a transformer in his kitchen so he could use it at home .

I was chatting to him as he ripped the box open with excitement and made his first cup of coffee........it was quick !

In my opinion a flask makes far better sense .
Personally I d prefer a can of coke.
 
DAKA said:
Well although I posted it very much tongue in cheek , the link was sent to me about a month ago by a mate who has just bought one, he was over the moon with it, even put a transformer in his kitchen so he could use it at home .

I was chatting to him as he ripped the box open with excitement and made his first cup of coffee........it was quick ! . . . . . .
Click to expand...

Was it the ripping open of the box that was quick? :rolleyes:

He will probably tell you it was a good buy? :(

Good Bye three hundred quid! :D

.
 
lenseman said:
If you look again very carefully at that YouTube promotional advert you will see that when he fills the unit and also when he pours it out, he only heats about an egg cupful (note the coffee bubble line inside the cup. This is a 'standard' sized coffee that you can expect when in Europe and not the normal ½-pint mugful (Cafe American) which most people in the UK expect.

The final stills shot from the Handpresso Company shows a coffee cup with froth about ½ full which is a bit of an admans cheeky selling and a long way short of a complete cupful. :mad:

They are probably quite useful is you just want an egg cupful of hot water? :p

.
Click to expand...


It's espresso coffee, you wouldn't want a mug full. Shame it doesn't froth milk too for a Latte or Cappuccino. They cost about £150 I believe.

I have a 12 volt filter coffee machine on the boat, takes about 20 minutes to make 2 reasonable sized cups of coffee.
 
captaindan said:
Anyone got any advice on 12 volt kettles looking for one for the boat but when im reading up on em they are saying 18 minute to boil time. surely that cant be right the time its boiled you would have to switch it on for your next cup any recomendations would be apreciated

thanks
Dan
Click to expand...

If you manage to find one and want to use it, make sure your wiring (usually via cigar lighter type connection) is meaty enough to provide 10+ amps for upwards of half an hour continuously.

It's not only the water that will get hot, that sort of current will mean your wiring and connections will also get rather warm (the thinner they are, and the dirtier or looser the connections, the warmer they'll get).

All perfectly safe and acceptable if you make sure the wiring is OK and designed for it, but in cars at least, as manufacturers have been lightening (read cheapening) their vehicles many have restricted the current that can be taken from a cigar lighter these days. There have been fires I believe in the past.

I bought a 12v electric kettle many years ago (20?) for use in my Mini Moke, and on the few occasions I have used it, it did take a long time but did work OK. Before you say it, Yes, I know Mokes didn't have cigar lighters as standard. So I installed one (out of sight under the dash) so therefore I knew the wiring was OK...
 
captaindan said:
Anyone got any advice on 12 volt kettles looking for one for the boat but when im reading up on em they are saying 18 minute to boil time. surely that cant be right the time its boiled you would have to switch it on for your next cup any recomendations would be apreciated

thanks
Dan
Click to expand...
18-20 mins is about right. Had one in the car for years, wouldn't be without it.
 
kashurst said:
I'm surprised it only takes 18 mins - boiling water requires a lot of energy.

don't bother, use the gas hob to boil water, or get an inverter that can run a normal 240V kettle (check out your battery capacity first), at least then you can run other 240V stuff like power tools and TVs etc.
Click to expand...

Spot on, water has a Specific Heat of around 4200 Joules/kg/deg. C.
Even heating a 200ml mug of water from 15C to 100C will need 71.4kJ.
That means you need to use almost 600W continously to get it to boil in around 2 minutes.

With a 12.5V element you'd be pulling about 48A and that doesn't allow for heat loss and other inefficiencies. You could do it quite easily but would require quite thick cables connected directly to the battery to run the heating element.

You can usually pull a max. of 10A from most lighter sockets and that would extend the time to around 8 minutes, probably nearer 10 minutes to allow for losses. Remember, that's just to heat 200mls.
 
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