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Thread: Power tank ?

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    Default Power tank ?



    Hi, I'm fairly new to Astronomy. I recently sold my 6" Reflector and have bought an 8" Orion Europa, it's still on the original mount ,and moves about a lot when the mount is locked so I'm looking for an E.Q.5. possibly with GoTo.
    Powertanks seem to cost a lot for what they do, and I wondered if anyone had a cheaper alternative......no great rush as the sky has been cloudy for ages!!!!

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    plenty of cheaper options that work just as well.
    here's mine.17ah and works a treat.cost a fraction
    of the celestron/skywatcher ones:

    plenty people have them.
    this may help too:
    Battery Power Supply & Powering Your Telescope Mount
    hope this helps.
    clear skies,
    Last edited by andyp180; 05-21-2012 at 05:53 PM.

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    andy

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    Ebay 35 Ah battery deep cycle 63 dollar US,, free s/h

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    I think large batteries eg car jump starter pack etc etc are best, but you can also run a scope from a mains to 12V transformer. I would definitely recommend using surge protection as well to protect your scopes electronics. Depending on where you are using your scope an extension to your car cigarette lighter is also a useful way as well

    Edit : Aldi occasionally have jump starters that are very cheap ( i posted a link to them a few months ago so they might be coming round again soon if you are lucky. Failing that or the links above - Maplins do a range of them, some with USB outlets and double cigarette lighter outputs which is pretty useful.
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    Quote Originally Posted by pushrod View Post
    I think large batteries eg car jump starter pack etc etc are best, but you can also run a scope from a mains to 12V transformer. I would definitely recommend using surge protection as well to protect your scopes electronics. Depending on where you are using your scope an extension to your car cigarette lighter is also a useful way as well

    Edit : Aldi occasionally have jump starters that are very cheap ( i posted a link to them a few months ago so they might be coming round again soon if you are lucky. Failing that or the links above - Maplins do a range of them, some with USB outlets and double cigarette lighter outputs which is pretty useful.
    A word of warning... do not run a scope directly from your car cigar lighter socket... it can drain your battery in a small number of hours if the car is not charging the battery.

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    Quote Originally Posted by Phil Leigh View Post
    A word of warning... do not run a scope directly from your car cigar lighter socket... it can drain your battery in a small number of hours if the car is not charging the battery.
    Hi Phil, even a small petrol engined car probs has at least a 40Ah battery and a telescope probs has a max demand in the the order of 750mA. So even a 4 hour session will only take 3Ah - not at all a problem if the battery is working and charging properly. I suppose if you are running a host of accessories eg dew heaters it makes sense to be aware of total power demands
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    Quote Originally Posted by pushrod View Post
    Hi Phil, even a small petrol engined car probs has at least a 40Ah battery and a telescope probs has a max demand in the the order of 750mA. So even a 4 hour session will only take 3Ah - not at all a problem if the battery is working and charging properly. I suppose if you are running a host of accessories eg dew heaters it makes sense to be aware of total power demands
    The problem is that car batteries are designed to provide massive starting currents for very short periods, not a steady drain over several hours without being topped-up. Try leaving your halogen or incandescent headlights on overnight...If your battery isn't in good shape/fully charged you can easily drain it in 5-6 hours to the point where it won't stat the engine!

    My mount draws 2a slewing, 1a tracking and dew heaters can pull twice that continuous...

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    Quote Originally Posted by Phil Leigh View Post
    The problem is that car batteries are designed to provide massive starting currents for very short periods, not a steady drain over several hours without being topped-up. Try leaving your halogen or incandescent headlights on overnight...If your battery isn't in good shape/fully charged you can easily drain it in 5-6 hours to the point where it won't stat the engine!

    My mount draws 2a slewing, 1a tracking and dew heaters can pull twice that continuous...
    I am well aware that a car battery is designed to perform differently to a leisure battery.

    A pair of halogen headlamps(2x50/55watt) though may well be allowing 8 or 9 amps to flow constantly, so it is not too surprising that they discharge your battery in 5 or 6 hours, some of the very powerful ones i'm sure could do it in even less.

    As i said earlier if you are "running accessories eg dew heaters it makes sense to be aware of total power demands" but a reasonably healthy car battery is not going to have a problem running your average scope for a few hours. I have a 5m cigarette lighter extension, sold by celestron, which i have used many times (summer and winter) and have never had any problems when using it.
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