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Thread: Battery Power Supply & Powering Your Telescope Mount

  1. #21
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    Default



    Well, not a definitive answer, but I would try it.
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  2. #22
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    A very interesting topic, I'm currently reviewing my battery situation. On my Dob I'm currently using a sealed "brick" 12v 8 amp hour unit to power the Sky Commander, Telrad heater (nicor wire around glass plate and the round lens), and the secondary heater. I'd like to make an eyepiece heater as well but this will probably deplete the battery pack quickly. I'm thinking of just adding another 8 amp battery as they are pretty inexpensive. They also fit neatly in the rocker box so there are no external cables to get tangled up in the dark.
    The Great Polaris mount with motor drives, Sky Commander, and heaters for the objective lens, finder scope, Telrad, and eyepiece requires a fair amount of amp draw. Would a lead/acid 30 amp or higher battery be an adequate power source? This setup draws about 5~6 amps as is depending on the # of heaters in use.
    Any comments appreciated, suggestions welcomed.

  3. #23
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    I've been toying with a power solution over the past few months. At the end of 2011, I decided to DIY a solution and this is what I've done.

    I took Bob G. suggestion back at the beginning of this thread. Bought a 35ah Deep Cycle battery from Batteries Plus, a battery box, 4 sockets and a switch. I've placed the battery in the box, secured it with left over foam from another project and mounted the sockets and switch to the box top. I then wired the whole set up as depicted in the attached schematic.

    This Battery setup will be driving both of my mounts and a laptop (connected to an inverter) in the field. I have not had a chance to check out how long it lasts with everything running...yet.

    Please let me know if someone sees a flaw in my design. The last thing I want to do is burn out the mount electronics. As you see in the schematic each socket has an inline fuse. I believe they are 12vdc @ 5 amps (could be 10amps).

    Thanks for looking and clear skies,
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  4. The Following 5 Users Say Thank You to tmohr For This Useful Post:

    admin (02-11-2012),ajohnson (07-10-2012),Astronewb (05-06-2012),budman1961 (07-18-2012),prc (07-08-2012)

  5. #24
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    Default Power Supply

    Quote Originally Posted by admin View Post
    Batter Power Supply & Powering Your Telescope Mount

    Ok didn't know much about telescope mount battery supplies (still learning a lot), but hope you find this guide useful.

    To power your mount, you will usually need either battery (D size batteries) or 12V power juice depending on your mount. A good power pack contains at least 900 Amps

    For 12V power, you can use car starters / jumper battery packs such as this one:
    [IMG][/IMG]

    You need to connect your telescope's mount 12V cable to this port here (which is next to the small yellow light and near the label input DC:

    [IMG]


    Tip:

    1. Charge at least once a week even if full as this maintains the battery.
    2. Remember to remove the 12V cable from the mount, I found that some juice is removed from the battery after a few hours even when the mount is powered off.



    Dedicated to Vinnie who helped me obtain the yellow power juice wonder.
    cheers mate
    I know this is an old post but could you please help me with this. I need to get a power pack like the one above. Im currently getting power from the celestron AC adapter 12V 2.5Amp for my nexstar 6se but will be going on a holiday soon and wont have an extension or mains to plug into.

    (1)How will this power pack ensure that the output is kept to 12V 2.5Amps?

    (2)Also how do I ensure polarity is correct?

    (3)Lastly, what cable do I use to connect the power pack to the scope?

    This is what I am currently using Celestron AC Adapter 18778 acadapter.jpg

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    If your external power cord on your mount is a "cigarette lighter" type (standard 12-volt DC plug-in), as supplied with my CGEM, then I would use one of the automotive power-packs sold at, say, Walmart, for less than $50. Most of them have 12v DC receptacles. Since they are batteries, their voltage will not vary. Do NOT use them to power your mount while they are plugged into a wall socket. I have a (I believe 6=amp/hr version which I have been unable to drain even after 6 or more hours of use. They can also be recharged off of your car battery. As far as polarity... I am sure someone here knows the answer to that question.
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  7. #26
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    Default Re: Battery Power Supply & Powering Your Telescope Mount

    Tom,
    I like your battery set-up.
    Did you buy the charger and battery box at Batteries Plus. How often do you have to charge the battery.

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    Default Re: Battery Power Supply & Powering Your Telescope Mount

    Prc, yes I bought the box, battery and charger at batteries plus. Cigarette lighter sockets and switch at Radio Shack. To date, I use this battery setup every time I go out with my telescopes, even at home. I can get two 5 hours sessions just running two mounts, no problem. I've even had all 3 of my mount/telescope combos running on this set up for a few hours with no power issues.

    Since I'm in to Astrophotography, currently, I take my CGEM, Laptop (running on an inverter), Canon T2i, guide camera and another telescope/mount with me in the field. I can get 7 hours with no problems.

    To answer your question, I charge the battery every time when I return home from the field. I haven't drained the battery completely, so I don't know the actual full "run time".

    Hope that helps a little,
    Tom

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    Default Re: Battery Power Supply & Powering Your Telescope Mount

    Quote Originally Posted by tmohr View Post
    Prc, yes I bought the box, battery and charger at batteries plus. Cigarette lighter sockets and switch at Radio Shack. To date, I use this battery setup every time I go out with my telescopes, even at home. I can get two 5 hours sessions just running two mounts, no problem. I've even had all 3 of my mount/telescope combos running on this set up for a few hours with no power issues.

    Since I'm in to Astrophotography, currently, I take my CGEM, Laptop (running on an inverter), Canon T2i, guide camera and another telescope/mount with me in the field. I can get 7 hours with no problems.

    To answer your question, I charge the battery every time when I return home from the field. I haven't drained the battery completely, so I don't know the actual full "run time".

    Hope that helps a little,
    Thanks Tom.
    You have helped me very much. I'm going to try to duplicate what you have done. Thanks again,
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    Default Re : Battery Power Supply & Powering Your Telescope Mount

    Good thread. It looks like the best advice is to leave pricey over gadgeted Celestron / Skywatcher power tanks alone, I will admit misgivings about battery life on these. I was actually thinking about using a leisure battery typically used in Motorhomes and Caravans (I think that translates as RVs and Trailers) and usually 65 - 110 A Hr but very heavy. I am looking at CG5-GT or a HEQ5 does anyone have rough figures on how much power these mounts draw on average?

    I have a rough idea on what a dew heater will draw, I'm just trying to get an estimate for "sizing" a power supply to see if I can get away something something a lot smaller and lighter.

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    Default Re: Battery Power Supply & Powering Your Telescope Mount

    AmithR1,

    The battery pack will maintain the voltage from 12.7v fully charged down to 11.9 at fully discharged. This will run your mount with no problems. You need not worry about the amps, as the battery will supply enough amperage required by the mount at various loads.

    This is a pic of polarity. All Celestron mounts are 'Positive';

    And lastly, I use these power cables from Radio Shack. They are 8' long coiled, fused, with LED power indicator, On/Off switch and a 90º connector on the mount end. The size of the connector on the mount is 5.5 x 2.1. ;

    Enercell Universal 12VDC Coiled Power Cord (8-Ft.) : Power Cords | RadioShack.com

    Stan
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