The efficiency is so low, that a standard D cell battery will be 
cheaper.  A propane torch will burn about 1 pound of propane in 10 
hours. Remember you must keep the fire running even when you do not use 
much power.   Propane cost about 50 cents a pound in 20 pound tanks.  
The TED produces very low voltage and higher current.  You will need to 
convert from less than 1 volt (at least for the unit I used)  to 3 or 5 
volts.   Have fun.  Don't expect a lot of power.  Don't expect any cheep 
power
bill j

>>Sometime after Christmas and before we go on holiday on about January
>>5th I hope to turn 10 x 68 Watt PEDs into a PED of whatever
>>performance may be achievable. Aim is to make something which can
>>charge a 12V battery for laptop and lighting use. TEG to be heated by
>>Propane.
>>    
>>
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