Old 20-12-2015, 09:21 AM
garymck (Gary)
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garymck is offline
Join Date: Aug 2005
Location: Geelong
Posts: 685
Portable power?


I'm currently putting together a portable imaging sytem. The idea is to have everything basically fitted to the OTA so that I don't have to connect/disconnect stuff and possibly forget to take some stuff away...

I will be connecting:
Filter wheel
All through a 12v Powered USB Hub.

I would like to make up a power connector so that I can link
Filter wheel
USB hub
Via a single power cable with 5 terminations.

That way I will have only 2 leads coming off the mount that I have to worry about routing to minimize drag.

Can anyone foresee any problems with this?

I have a 13.8v 10 amp power supply to take away - any problems with running 12v labelled stuff with it?

I have already trialed everything going through the hub with no issues whatsoever. It's just the power I'm not sure of...

(electronically challenged)
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Old 20-12-2015, 09:32 AM
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Merlin66 (Ken)
Spectroscopy Wizard

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Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,074
The 13.8V is OK - that's about the same as a fully charged battery.
I use 240/12v 10A transformers in the observatory - I have one dedicated (at set to 15V) for the mount and the other for all the rest of the gear.
My USB powered hub needs 5.5V so I run it from a 12/6V stepdown convertor.
For the "portable" HEQ5 I use a couple of 20Ah gel cell batteries which are still going strong after eight years (try that with one of those car starter packages!)
Hope this helps.
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Old 20-12-2015, 01:39 PM
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GrampianStars (Rob)
Black Sky Zone

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Join Date: Apr 2005
Location: Western Victoria
Posts: 776
Cool Power Supply

"Can anyone foresee any problems with this?

I have a 13.8v 10 amp power supply to take away - any problems with running 12v labelled stuff with it?"

Seriously your only going to get a whole lot of issues with that heating up

You will need at least this 85Ah deep cycle battery:
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