lezgar
New member
I have seen this advert http://dragonet.com/fhp/ about a 12 Saltwater Generator.
Have somebody tried it?
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Have somebody tried it?
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12 volts Saltwater Generator
- Thread starter lezgar
- Start date
snowleopard
Active member
i have made this sort of thing many times in school chemistry lessons. any two dissimilar metals immersed in a conducting liquid produce a voltage so for example you could put strips of copper and zinc in a salt solution and you have a battery.
the catch is that the cathode (in the above example the zinc electrode) is eaten away so needs to be replaced frequently. the more current you draw, the faster it goes. in a rechargable battery you push current the other way and re-deposit the material on the cathode but you can't realistically do that in sea water.
so what they are advertising is a disposable battery which is lightweight because you add your own electrolyte. the cost per amp-hour must be pretty spectacular!
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the catch is that the cathode (in the above example the zinc electrode) is eaten away so needs to be replaced frequently. the more current you draw, the faster it goes. in a rechargable battery you push current the other way and re-deposit the material on the cathode but you can't realistically do that in sea water.
so what they are advertising is a disposable battery which is lightweight because you add your own electrolyte. the cost per amp-hour must be pretty spectacular!
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