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My astronomy project:
Building a battery box and an astro server


  1. Astroserver and powerbox, ver 1.0
    1. Introduction to battery box and astroserver
    2. Fuse box and fuses
    3. Box and charging
    4. Overview computer and accessories
    5. USB 5 volt external power
    6. Motor focus power
    7. Get rid of messy cables
    8. Cleaning up installation
    9. First outdoor test
    10. Replacing USB-Hub
    11. USB-Hub and focus driver holder
  2. Astroserver and powerbox, ver 2.0
  3. Balcony outdoor outlets
  4. Lithium Battery power

I take no responsibility or liability for what are written here, you use the information on your own risk!

Page I.6: Motor focus power

Has now added an additional outlet on the existing 12 to 8 volt converter so that the focus motor can take the same power as the camera does.

21 12 to 8 volt converter

Trying to keep down the number of components so it's very good that the voltage converter can be used for two devices. A word of caution, USB Focus as my focus drives is called, I am very pleased with, but one thing, the small switch to choose between internal or external power supply is very fragile. My broke when I was changed to the other state with a small screwdriver. Will you do something like this, disassemble the box so you can see properly how the switch should be moved. Now I made simply so that I removed the switch and soldered with a wire jumper instead.

22 overview (click on the image to get a full resolution photo in a new window)

Here is an overview, quite tangled apparently, the telescope is barely visible behind all the wires. But if everything works well without a lot of communications problems should I buy shorter USB cables A to B of 30 cm. Focus motor now had a completely different torque when connected to 8 volt supply, I can hardly hold it.

23 battery and computer in box

Even inside the battery box it has been cleared up. The battery under the red plastic cover. On top is the GPS receiver, normally sits on top of the lid. A mounting bracket for the power button is missing as well as a current and voltage meter, would rather have one that can be connected to the computer through USB, has not found anything useful yet. Between the telescope and computer I need two USB cables. One to control the Canon camera, the other to bulb control, EQ6 control, focus motor, guide camera. With the Canon camera I've had a lot of problems with the USB connection. Easily lose connections, now with separate cable the problem seems to be manageable. I guess newer cameras do not have this big problems.

With the new Canon 6D camera the USB communication works much better, and now I can reduce the USB cables to only one, there is no need for a bulb cable.

I have also two power cables. One to the EQ6 mount. The second of the two voltage converters (Canon Camera, focus motor, USB hub), heat band.

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