Re: 12V power supply for Mach1


Sep 26, 2009

 


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#25790 Sep 26, 2009

Hi,



I've been using a 65AH 12V battery with automatic battery recharge to power the Mach1. It's worked fine - the battery is nearly new. Right now, unconnected to the mount, the battery puts out 14.48 V and where the mount power cord is plugged in the power is 14.04V; but earlier this evening and last week when I was trying to use the mount the power available to the mount was only about 13.3V. The motor struggled and stalled during slewing. I parked the mount and disconnected it. The yellow light was on occasionally, otherwise it was red.



I presume the reason the mount stalled was because of insufficient power? But how does one guarantee 14V output (which is what I understand this mount needs) from a nominally 12V battery? What kind of battery or power supply should I be using?



Thanks,

Neil Folberg



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#25791 Sep 26, 2009

I had no trouble with mine using the 12 volt battery, however I slew at a

max speed of 600. What are you slewing at?



Dean



----- Original Message -----

From: "neilhfolberg" neilhfolberg@...>

To: ap-gto@yahoogroups.com>

Sent: Saturday, September 26, 2009 5:21 PM

Subject: [ap-gto] 12V power supply for Mach1





> Hi,

>

> I've been using a 65AH 12V battery with automatic battery recharge to

> power the Mach1. It's worked fine - the battery is nearly new. Right now,

> unconnected to the mount, the battery puts out 14.48 V and where the mount

> power cord is plugged in the power is 14.04V; but earlier this evening and

> last week when I was trying to use the mount the power available to the

> mount was only about 13.3V. The motor struggled and stalled during

> slewing. I parked the mount and disconnected it. The yellow light was on

> occasionally, otherwise it was red.

>

> I presume the reason the mount stalled was because of insufficient power?

> But how does one guarantee 14V output (which is what I understand this

> mount needs) from a nominally 12V battery? What kind of battery or power

> supply should I be using?

>

> Thanks,

> Neil Folberg

>

>

>

---------------

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>





---------------







No virus found in this incoming message.

Checked by AVG - www.avg.com

Version: 8.5.409 / Virus Database: 270.13.113/2397 - Release Date: 09/26/09

17:51:00



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#25796 Sep 26, 2009

Forgot to add that slew speed is 600 and all the cables are pretty heavy duty, installed by a professional electrician when we wired the house - done to an industrial standard.



Thanks for your thoughts on the subject - are there alternatives to the 12V battery power or would a higher amperage battery help?



Neil

--- In ap-gto@yahoogroups.com, "neilhfolberg" neilhfolberg@...> wrote:

>

> The only thing connected to the battery last night was the Mach1; in the past, when imaging, I also have had an STV autoguider connected, but as I said with no problems.

>

> In between the MAch1 power cord and the battery is an extension to the pier area, about 1.5 meters long. The battery sits about 1 meter from the pier, and the cables run underneath the floor.

>

> Neil

>

> --- In ap-gto@yahoogroups.com, "Howard" howard@> wrote:

> >

> > How are you connected - specifically, what connects the mount's power

> > cord to the battery? What else is connected to this battery?

> >

> >

> >

> > I use my trusty Optima D34M marine battery all the time with no problems

> > at all. But, I have a heavy duty connection to the battery, and a

> > separate battery for everything else.

> >

> >

> >

> > Mag. 7 skies!

> >

> >

> >

> > Howard Hedlund

> >

> > Astro-Physics, Inc.

> >

> > 815-282-1513

> >

---------------

> >

> > From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf

> > Of Dean S

> > Sent: Saturday, September 26, 2009 5:01 PM

> > To: ap-gto@yahoogroups.com

> > Subject: Re: [ap-gto] 12V power supply for Mach1

> >

> >

> >

> >

> >

> > I had no trouble with mine using the 12 volt battery, however I slew at

> > a

> > max speed of 600. What are you slewing at?

> >

> > Dean

> >

> > ----- Original Message -----

> > From: "neilhfolberg" neilhfolberg@

> > mailto:neilhfolberg%40yahoo.com> >

> > To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com> >

> > Sent: Saturday, September 26, 2009 5:21 PM

> > Subject: [ap-gto] 12V power supply for Mach1

> >

> > > Hi,

> > >

> > > I've been using a 65AH 12V battery with automatic battery recharge to

> > > power the Mach1. It's worked fine - the battery is nearly new. Right

> > now,

> > > unconnected to the mount, the battery puts out 14.48 V and where the

> > mount

> > > power cord is plugged in the power is 14.04V; but earlier this evening

> > and

> > > last week when I was trying to use the mount the power available to

> > the

> > > mount was only about 13.3V. The motor struggled and stalled during

> > > slewing. I parked the mount and disconnected it. The yellow light was

> > on

> > > occasionally, otherwise it was red.

> > >

> > > I presume the reason the mount stalled was because of insufficient

> > power?

> > > But how does one guarantee 14V output (which is what I understand this

> >

> > > mount needs) from a nominally 12V battery? What kind of battery or

> > power

> > > supply should I be using?

> > >

> > > Thanks,

> > > Neil Folberg

> > >

> > >

> > >

---------------

> > >

> > > To UNSUBSCRIBE, or for general information on the ap-gto list

> > > see groups.yahoo.com/group/ap-gtoYahoo

> > groups.yahoo.com/group/ap-gtoYahoo> ! Groups Links

> > >

> > >

> > >

> >

---------------

> >

> > No virus found in this incoming message.

> > Checked by AVG - www.avg.com

> > Version: 8.5.409 / Virus Database: 270.13.113/2397 - Release Date:

> > 09/26/09

> > 17:51:00

> >

> >

> >

> >

> >

> > [Non-text portions of this message have been removed]

> >

>







----------------------------

#25810 Sep 28, 2009

In a message dated 9/26/2009 4:22:31 PM Central Daylight Time,

neilhfolberg@... writes:



> I've been using a 65AH 12V battery with automatic battery recharge to

> power the Mach1. It's worked fine - the battery is nearly new. Right now,

> unconnected to the mount, the battery puts out 14.48 V ...

>



How does the automatic battery recharging work?



The smart trickle charger I'm familiar with uses a technique

of high voltage and low amperage to gently charge a

battery and maintain it at a fully charged state.

As I remember, the charging voltage is in the range you're

seeing. Is it possible that you're trying to run off

the battery at the same time that the charging circuit

is active?



Jerry



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#25815 Sep 28, 2009

In a message dated 9/28/2009 1:38:02 PM Central Daylight Time,

neilhfolberg@... writes:



> But Rolando, if a charged 12V battery puts out 12.5, it is not then an

> appropriate power source ever for a MAch1 which wants a minimum of 14?

>



Who ever told you that? The Mach1 has the same servo controller as all our

other mounts, and they will certainly run just fine, even at 1200x at 12

volts from a battery. I have two mounts set up in my observatory, and they both

run off old marine batteries. Both batteries have trickle chargers attached

which keeps them full during off-times, but do not supply enough current to

run the servos during observing time.



Rolando





[Non-text portions of this message have been removed]



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#25816 Sep 28, 2009

>Yes, that is it, which is why it showed more than 12V when connected. >The actual

output currently is as Rolando suggested less than 12V. >



Neil, my guess is that something's wrong with your charging

circuit, that the battery is being drained at the same

time that it's being charged, so it's not ever actually

being charged properly.





Jerry



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#25819 Sep 28, 2009

In a message dated 9/28/2009 2:29:49 PM Central Daylight Time,

neilhfolberg@... writes:



> But in principle, a 12VDC 65 AH car battery is sufficient to run the MACH

> mount? Or bigger is better?



That is plenty. If one of the cells is damaged, then all bets are off. You

might see 14 or even 15 volts with the charger attached, but as soon as you

put a load on it, the voltage will drop like a rock and may be below 11.



Rolando





[Non-text portions of this message have been removed]



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#25832 Sep 30, 2009

Thanks all for your advice. The battery is defective and I'm replacing it.



Neil


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