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Silicone heater bed power rating

Posted by pyt 
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pyt
Silicone heater bed power rating
August 12, 2016 04:30PM
I got this some time ago: [store.quintessentialuniversalbuildingdevice.com]

CIRCULAR 24V SILICONE RUBBER HEATER BED 200MM DIAMETER (8") - Draws Up to 12 Amps So Make Sure Your Power Supply Can Handle It...a 350W+ or Dedicated 24v Power Supply is Recommended

Does that mean it draws ~288W with a power density of ~0.9W/cm2?

Edited 1 time(s). Last edit at 08/12/2016 09:50PM by pyt.
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dc42
Re: Silicone heater bed power rating
August 12, 2016 04:43PM
Yes. That's a very high power density, so I suggest you turn down the power supply voltage if you can. That amount of power would normally be used for a 300mm bed, not 200mm.


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Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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pyt
Re: Silicone heater bed power rating
August 12, 2016 09:58PM
Is there any way to verify if the power density is indeed ~0.9W/cm2?

I have some doubts as many other similar silicone heater beds are only around half the power density.
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dc42
Re: Silicone heater bed power rating
August 13, 2016 03:35AM
Measure its resistance with a multimeter, then you can work out the heating power at 24V.


Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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pyt
Re: Silicone heater bed power rating
August 16, 2016 04:25AM
Thanks for the help.

The resistance is 4.5 Ohms. At 24V, the heater will draw ~5.3 Amps; or 128 Watts putting it at ~0.5W/cm2.

Edited 1 time(s). Last edit at 08/16/2016 05:03AM by pyt.
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