Quote:
Originally Posted by mswhin63
There are few variables missing.
One is how long to you require to connect for without battery charging?
For the Basic (5/12)V*3A*8hr = 10Ahr Battery. I would at a minimum operate at 20Ahr for that configuration at it has a good power/weight operation.
I currently use 2 regulators to convert, one at 5V for RPi and 8V for my Canon Camera. Both are cheap eBay unit which some people have imported at a good cost into Australia. These though require a bit of additional casing additions.
Factor is you have taken the power consumption of the RPi 4 specification, have you included the mount, camera and any other peripherals into the calculation. The RPi 8G model I have only draws 1.2 amps @ 12V including the camera, mount and focus module so the battery consumption will be a lot less.
I was up until 2 days ago was going to run Astroberry, because I am using a Focuser that was developed only for Linux, but I had too many issues with PHD2 chacking wobblies that it is to much for me to play around with. Already missed opportunities to image properly. I am for the meantime going back to Windows operation so I can start imaging.
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I don’t plan running everything off the same battery. Mount, cameras etc will run off a different setup. I have a plethora of deep cycle batteries ranging between 38 and 50 AH. So I’m not too worried on that score.
The Pi4 Specs put its power consumption at 15 Watts. Not sure about that figure of 1.2 Amps which would translate to about 6 Watts. Somehow that doesn’t sound right.