Addendum - Electrical Equipment

Power Requirement

updated: 2024-10-15


The following assumptions were made to estimate the power requirement:


  • Stationary continuous operation after GoTo and complete cooling of the camera to -10°C
  • Use of ASI cameras and an ASIAIR control unit


Equipment

Current Requirement (A)

Power (W)

Camera: ASI294MC PRO

For cooling (at constant -10°C): 0.9A @ 12V
       + 0.1A for the camera @ 5V

during cool down: max: 1.8A @ 12V

10.1W

22.1W max

Camera: ASI2600MC AIR

For cooling (at constant -10°C): 1.2A @ 12V
       + 0.1A for the camera @ 5V

during cool down: max: 1.8A @ 12V

14.4W

22.1W max

Guider: ASIAIR Plus

Standby: ~ 0.6A @ 12V
Operation: 1.0A @ 12V

7.2W
12W

Mount: ZWO-AM3 

Tracking / guiding): 0.5A @12V

GoTo (normal weight): 0.7A @12V

GoTo (heavy weight): 1.3A @12V

6W
8.4W max
15.6W max

Mount: iOptron iEQ45 PRO

Tracking / guiding: 0.45A  @12V
GoTo: 0.75A  @12V

5.4W

9W

Example:

For 1 hour of constant guiding / tracking using the following power is required:

Equipment

Current Requirement (A)

Power Consumption (Wh) 
per hour

Config 1

Mount: ZWO-AM3 or iEQ45 PRO

Camera: ASI294MC PRO

Guider: ASIAIR Plus

 0.5A @12V

0.9A @ 12V

1.0A @ 12V

6.0 Wh
10.1 Wh

12.0 Wh

Total: 2.4A @ 12V

Total: 28.1 Wh

Config 2

Mount: ZWO-AM3 or iEQ45 PRO

Camera & Guider: ASI2600MC AIR

 0.5A @12V

1.2A @ 12V

6Wh
13.4Wh

Total: 1.7A @ 12V
(measured: 1.6A @ 12V)

Total: 19.4Wh


The following maximum operating times for batteries can be derived from this information:

Battery Capacity (@ 12V)

Config 1

Config 2

7Ah / 84Wh
(Celestron Powertank LiFePO4 84 Wh)

max. 3h

max. 4.3h (new battery)

max. 3h (5 yr. old power tank)

 12 Ah / 144 Wh

~ 5.12h

~7.4h

 13.6 Ah / 158 Wh

~ 5.6h

~8.1h

 20 Ah / 240Wh

~8,5h

~12.3h

50 Ah / 600 Wh (car battery)

~21h

~ 30h


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