12v 300w heating element installed in a 3 liter really useful box. The eggs were hard boiled in 10 minutes and 1.5 liters of water water took about 20 minutes to get to boiling point while connected to the battery. The element is powered using solar panels and a deep cycle battery. I have in total 8 100w panels which were all giving a maximum of 45 amps today.
If you are interested in these heating elements, you can get them here in various voltage and power ratings. They are not cheap unfortunately and you will need a 1 inch NPT lock nut to secure it in place. When connected directly to my panels the 12v 300w element I was using would hit 600 watts at around 17v.
Post time: Oct-07-2017