P r i m a L u c e L a b S . p . A .
E AG L E 4 U s e r M a n u a l
First use: how to choose the correct power source
EAGLE allows you to distribute power to many devices used in telescopes astrophotography (such as mount, camera, fil-
ter wheel, electronic focuser, dew heaters, etc.), thus eliminating the need for many different power supplies. Since the
EAGLE allows you to have a single power source (battery or AC adapter), it’s important to select the correct power source
to properly power all the devices you want to use.
Which battery or power supply have I to use for my equipment?
The power supply or battery you need to use to power the EAGLE and all peripherals connected to it depends on the elec-
tric current needed to power all the instruments plus the EAGLE. Let’s make an example by considering the EAGLE basic
model, that needs for an average of 0,6 Ah:
- EAGLE: 1,2Ah maximum consumption (average consumption: 0,6Ah)
- Cooled camera: 4Ah maximum consumption (average consumption: 3Ah)
- Computerized mount: 2Ah maximum consumption (average consumption: 1Ah)
- Guide camera: 0 consumption (power from the USB port of EAGLE)
We’ll have a total maximum power consumption: 7,2Ah. So, for this setup, you should use the 14A AC adapter. If you want
to use a battery (WARNING: The battery must have a 12V voltage regulator with protection system) that can power the
entire system for 8 hours (for example for the duration of an astronomical night), you will need a battery with a capacity of
at least:
7,2Ah (consumption per hour) x 8 (hours duration) = 57,6 Ah
p a g e 5
CAUTION
EAGLE must be powered with 12V regulated voltage. You can use a power supply with 12V output voltage or a
field battery. If you use a battery, this MUST be provided with a proper voltage stabilization. In case of any mal-
function, immediately unplug the power supply.
DO NOT CONNECT TO THE EAGLE A BATTERY WITHOUT
12V VOLTAGE REGULATOR
since it may damage the other instruments powered by EAGLE (like the cooled
camera). Immediately disconnect power supplies or battery if there’s any malfunction of the unit.
TIP
When many devices are powered through the EAGLE (and Ampere consumption exceeds 5Ah) we re-
commend the use of a power supply or battery with voltage regulator set to 12.8V volts instead of 12V.
This is because, when you distribute power to many devices and you have an high power consumption,
there’s a normal and small voltage drop: by setting your source at 12.8V, you will have a voltage of 12.xV
in the EAGLE’s power out ports and this will be fine with all your 12V powered devices. The important
thing is to have the voltage not lower than 12.0V. In order to create a large capacity field battery and have
a voltage of 12.8V, you can connect to the battery a 220V inverter and then connect to this the standard
12.8V 12A AC adapter for EAGLE.
