A battery-operated oven?

Question

does it exists?

Answer 1

The short answer is: no. You can't store enough energy in batteries to run an oven.

For cooking, you really need at least a kilowatt of power (though most electric ovens are rated at 3kW and many gas ovens are 4-5kW), and you need to keep it going for at least half an hour. So that's a minimum of 500 watt-hours of energy. Remember, watts = volts * amps.

NiMh D-size cells are rated at about 4 amp-hours. So you could discharge them at 8 amps in half an hour. Now to get 1000W at 8A, you would need a voltage of 1000 / 8 = 125V. At 1.25V/cell, that will take 100 cells -- and note that this is only enough for *one* cooking cycle! And this is going to run them really flat; so you'll have to get them recharged as soon as possible afterward, if you want to keep them able to hold a charge. Of course, you could use more cells to allow a longer cooking cycle per charge.

12V car batteries are rated at anywhere from 40 amp-hours up. That's 480Wh, so just about enough for one meal. You will be pulling a current of over 80 amperes through the heating element -- bear that in mind when constructing your thermostat.

Conclusion: If you really have to cook something in a place where it's not feasible to arrange an electrical supply, you'd be better off just lighting a fire.

Answer 2

Microwave Ovens

Answer 3

The closest thing you will get to is running a microwave oven through an inverter. The inverter will need to withstand the startup peak wattage that is required get the oven started. These are used quite often on boats/yahcts.