How do I know if I need the 21A TheSky Fusion Power Supply or the 11.5A model?
You must calculate the total power budget for your imaging system. Check the manufacturer's specifications for every 12V device you will connect to TheSky Fusion (mount, camera, focuser, dew heaters) and add up their maximum amperage draw. If the total is less than 11.5A (138W), the 11.5A PSU is sufficient. If the total is between 11.5A and 21A (252W), you need this 21A model.
My setup includes a Paramount MYT mount, a cooled CMOS camera (5A), and two dew straps (3A total). Is the 21A TheSky Fusion PSU correct?
No, for that specific setup, a smaller power supply would be more appropriate. Paramount mounts require 48V DC and run from their own power supply, so only the camera and dew straps count: 5A + 3A = 8A (96W). This is well within the capacity of the 11.5A (138W) model. The 21A PSU would work, but it would be oversized for your needs unless you plan to add more high-draw equipment soon.
What happens if my equipment draws more than 21A from TheSky Fusion Power Supply?
TheSky Fusion system itself supports a maximum total wattage of 480W. If your equipment's power requirements exceed the 252W (21A) provided by this PSU, you will need to source a third-party 12V DC power supply rated for up to 40A to safely power your system.
I plan to power a large mount and multiple cameras through TheSky Fusion at a remote observatory. Is this 21A PSU enough?
It depends entirely on the specific components. A large observatory-class mount, multiple cooled cameras, and aggressive dew control can easily exceed 21A. You must perform the power budget calculation. For example, two cooled cameras (5A each) and multiple dew strips (5A) would total 15A, making this 21A PSU the correct choice. A Paramount mount is not part of this budget: it requires 48V DC from its own power supply.
What are the physical dimensions of the 21A TheSky Fusion Power Supply?
Software Bisque does not state the unit's own dimensions or weight; the 8 × 12 × 2 in and 2 lbs on its listing are shipping figures.
Can I use the 21A TheSky Fusion Power Supply with other hardware?
While it is a standard 12V DC power supply, it is specifically designed and warrantied for use with TheSky Fusion. Using it to power other devices directly is not its intended application and may not be supported.
