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Need Help With Battery Heating Elements! Answered

I’m seeking advice on building a battery powered heating element, goal being 1300 degrees Fahrenheit.  I have a 4.8v 4200mah battery and Kanthal A-1 20, 26, 30 gauge wire, but am not limited to this material. The element will be a circle with a diameter of about an inch, similar design to a range coil.   Hoping someone can help me, feel free to ask any further questions.

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Downunder35m

4 years ago

What exactly is your problem?

Measure the heating wire to match the power supply, wind it up and connect it with a switch.

Temp control can be done with infrared sensors or dedicated temp sensors and a meter.

But without knowing you goal it is quite hard to give proper advice here.

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I can't keep the wire got. I connect it to the battery it heats up and cools off. When you say measure the heating wire to match the power supply, what do you mean?

I'm trying to heat it for around 7min. How did you know I need a 1.1ohm wire? Just trying to become more fimiliar with this stuff.

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As I said, simple maths and logig:

Battery has 4.8V and 4.2Ah - this means it can safely deploy 4.2A for the time of 60 minutes, after that the voltage goes down below the limit for the discharge of the battery.

So if your draw only 2A from the battery the time will be longer, more than 5A and you either damage the battery with over heating or it simply drains much faster.

4.8V / 4.2A = 1.1Ohm resistance for the job.

Having said that, using a thinner wire that reaches the temp with less current gives you longer operating times between recharges but of course not for every project it is feasable to use hair thin heating wire.

The thicker the wire, the lower the resistance will be.

Having a lab power supply at hand really helps here as you can see the changes in the amps in relation to the lenght of the wire directly and with no affect on the input voltage.

But 4.8V is quite low for a task like this unless the stuff you want to heat is very small too.

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You are saying you connect the wire to the battery, it heats up and cools off without you disconnecting it?

If so, is the battery still charged after that?

And what I meant before is simple math:

If your battery is capable of 4.2A for an hour (4200mAh) it means the max resistance of the wire should be just over 1.1Ohm.

But this is the pure basics and does not account for the max current rating of the battery.

To get and keep the temperatures you seek I would either use a bigger battery or extreme thin wire.

No idea what you are trying to heat and for long you need the heat but I wouls suspect your battery is far too small for the task.