Power Sources
The DewBuster™ Controller may be operated on a 12V Battery or a 13.8 VDC Power Supply (a fully charged 12V battery is 13.8V). As shown above, if you need to switch between different power sources you may order your DewBuster™ Controller with a Powerpole® connector so that you can switch between different pigtails to fit various power sources. If you do not need this capability then order your  DewBuster™ Controller with the power cord that fits your power source. For more information about power cords click here.

If you need help selecting a battery see my FAQ on power sources. If you have a battery and 120 VAC available, you can power the DewBuster™ Controller while charging the battery (use a normal charge rate, do not "Fast Charge") thereby using the battery as an Uninterruptable Power Supply.

If you are purchasing a power supply it should be a 13.8VDC Power Supply and rated for at least twice the maximum DC Amps that your heaters and other devices will use (ignore AC input fuse Amps which will be much smaller). See heater manufacturer's web site for the Amp rating of each heater and add them together. I suggest using a "linear" power supply rather than a "switching" or "switch mode" power supply because dew controllers pulse the heaters (turn them on and off several times per second) and switching power supplies have trouble with the large fluctuations in current. Linear power supplies have big transformers and heavy duty regulators that can handle such large current changes but switching power supplies may have trouble and often create RF noise that can interfere with camera equipment. Linear power supplies almost always have ventilated enclosures and are not designed for outside use so be sure to use a Ground Fault Interrupter (GFI) to power it and place the power supply in a protective enclosure to keep moisture out. I suggest a plastic storage box about twice the size of the power supply. This Hefty® 18qt Plastic Storage Container works well and the lid can be placed on the ground with the power supply sitting on it to keep it off the wet ground, then the bottom of the storage box can be turned upside-down and used to cover the power supply protecting it from dew while the dark gray color shields the light from the LED's. Leave a gap to allow heat to escape. It's OK for the power supply to get warm (helps keep it dry) but you do not want the power supply to get hot.

USA customers: Pyramid makes several reliable and reasonably priced power supplies (see below). If you find other reliable and reasonably priced units please send me a link.

International customers: there are many "HAM Radio" power supplies available. Try searching the internet using keywords like "Australia 13.8 Volt 10 Amp Bench Power Supply". If you find a reliable and reasonably priced unit please send me a link.

  • Pyramid Model PS21
  • Amazon link
  • Linear Power Supply, 13.8VDC, 20 Amp continuous current
  • Banana Jack connections (No Cigarette Socket).
  • This is overkill for smaller telescopes but a good choice for 14" and larger SCT's.
  • Pyramid Model PS14
  • Amazon link
  • Linear Power Supply, 13.8VDC, 12 Amp continuous current
  • Banana Jack connections (No Cigarette Socket).
  • Good choice for all telescopes and can handle a 14" SCT.
  • Pyramid Model PS15
  • Amazon link
  • Linear Power Supply, 13.8VDC, 10 Amp continuous current
  • Cigarette Socket and Banana Jacks.
  • If you need a cigarette socket go with this, otherwise the PS14 is a better bargain.
  • Pyramid Model PS9
  • Amazon link
  • Linear Power Supply, 13.8VDC, 5 Amp continuous current
  • Cigarette Socket and Banana Jacks.
  • Recommended only if space is tight and for no larger than 5" refractors or 8" SCT's.

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