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 Post subject: power pack
PostPosted: Sun Mar 09, 2014 4:57 pm 
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Joined: Sat Jan 11, 2014 2:32 pm
Posts: 48
Location: Shaw,Oldham
what kind of portable power do use when you go out in the wild for your telescope mounts


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 Post subject: Re: power pack
PostPosted: Sun Mar 09, 2014 7:07 pm 
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Joined: Mon Oct 12, 2009 6:47 pm
Posts: 1235
Location: Bolton
I use a 45Ahr car battery when I'm in my own garden, or a 17Ahr gel-battery for events like last week's at Sharples.
http://www.boltonastro.co.uk/forums/viewtopic.php?f=6&t=578&p=2334


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 Post subject: Re: power pack
PostPosted: Sun Mar 16, 2014 2:02 pm 
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Joined: Mon Oct 12, 2009 8:07 pm
Posts: 162
Location: Bury
Same here, I use a car battery. If you go down to the scrap yards you can pick one up for £10 as I did.

It cost about £60 to complete using a marine battery box, terminals, cigarette lighter plugs, fuse box, and wiring. Could of gone for a smaller battery box but I got space if I wanted to add anything extra.


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_________________
Celestron 11" Telescope
Eq6 Pro Mount
Eq5 Mount
EQ Mod
QHY5 Guide camera
Cannon 1000D SLR Camera

I choose to image with an 11" SCT Celestron in this decade and do the other things, not because they are easy, but because they are hard......
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 Post subject: Lightweight Lithium power pack
PostPosted: Sun Jul 31, 2016 12:54 pm 
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Joined: Mon Oct 12, 2009 6:47 pm
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Location: Bolton
I've just bought one of these Lithium batteries to try:
http://www.ebay.co.uk/itm/201452312185

Its claimed capacity is just under 7 Ampere-hours: very similar to a popular size of Lead-acid battery (which can be bought for a similar price) - but the Lithium pack is considerably smaller and lighter:
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File comment: Lunt solar-scope on an old Tasco StarGuide mount powered by the lightweight Lithium battery-pack (ringed)
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It's light enough that it could even be strapped to the arm of a GoTo Alt-Az mount?

However the Lithium battery's voltage will drop under 11V as it discharges (whereas the Lead-acid one should remain above 12V), so I'll have to see how it works out in practice...


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