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power pack

Posted: Sun Mar 09, 2014 4:57 pm
by ANuttall
what kind of portable power do use when you go out in the wild for your telescope mounts

Re: power pack

Posted: Sun Mar 09, 2014 7:07 pm
by rwilkinson
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.
viewtopic.php?f=6&t=578&p=2334

Re: power pack

Posted: Sun Mar 16, 2014 2:02 pm
by cstone
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.

Lightweight Lithium power pack

Posted: Sun Jul 31, 2016 12:54 pm
by rwilkinson
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:
lithiumpower.jpg
Lunt solar-scope on an old Tasco StarGuide mount powered by the lightweight Lithium battery-pack (ringed)
lithiumpower.jpg (328.01 KiB) Viewed 5547 times
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...