AC-DC Power supply for AP Mach1 GTO CP4


Diego Gomez
 

Hello All,

I am looking for a new AC-DC power supply to replace the one I was using to power up my AP Mach 1 and I wondered if the following one could be used:

https://www.amazon.ca/Adapter-Converter-Cigarette-Inverter-Massager/dp/B014TCBZPI/ref=pd_aw_sbs_107_of_1?_encoding=UTF8&pd_rd_i=B014TCBZPI&pd_rd_r=23d7fe17-f659-11e8-b1af-c353f8636503&pd_rd_w=sF9Sy&pd_rd_wg=XFSzX&pf_rd_i=mobile-dp-sims&pf_rd_m=A3DWYIK6Y9EEQB&pf_rd_p=3fa2d334-7ab1-47df-a46b-3a607fd250e3&pf_rd_r=8PHYZSWC04AAD04RGVCB&pf_rd_s=mobile-dp-sims&pf_rd_t=40701&psc=1&refRID=HY91D7SZ499NT0QRA98F

Probably the only issue I see with this unit is that the output voltage won’t be higher than 12.5VDC and AP recommendation is to use 13.8 VDC specially in cold weather (my case since I live in Canada)

I know most of the people recommend the ones from Powerwerx however cheapest one is $120.

Your commens will be highly appreciated.

Thanks,
Diego


Roland Christen
 

These kind of converters tend to be fairly noisy electrically and are not well regulated. Might give you some problems during slewing if the voltage dips. I would avoid unregulated power supplies.

Rolando



-----Original Message-----
From: diego_gomezp@... [ap-gto]
To: ap-gto
Sent: Sun, Dec 2, 2018 11:57 am
Subject: [ap-gto] AC-DC Power supply for AP Mach1 GTO CP4

Hello All,

I am looking for a new AC-DC power supply to replace the one I was using to power up my AP Mach 1 and I wondered if the following one could be used:


Probably the only issue I see with this unit is that the output voltage won’t be higher than 12.5VDC and AP recommendation is to use 13.8 VDC specially in cold weather (my case since I live in Canada)

I know most of the people recommend the ones from Powerwerx however cheapest one is $120.

Your commens will be highly appreciated.

Thanks,
Diego



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Diego Gomez
 

Well, after reviewing my options, I decided to order the Powerwerx variable 30AMP DC power supply with digital meters.I hope it works fine under low ambient temperatures (-15C or 5F).

Cheers,
Diego


Mark Striebeck
 

I have that power supply and it works for quite a while (2+ years) really well. But it doesn't get crazy cold in California, so I can't say anything about that.

     Mark

On Thu, Dec 13, 2018 at 8:36 AM diego_gomezp@... [ap-gto] <ap-gto@...> wrote:
 

Well, after reviewing my options, I decided to order the Powerwerx variable 30AMP DC power supply with digital meters.I hope it works fine under low ambient temperatures (-15C or 5F).


Cheers,
Diego


Mike Dodd
 

On 12/13/2018 11:36 AM, diego_gomezp@yahoo.com [ap-gto] wrote:

Well, after reviewing my options, I decided to order the Powerwerx
variable 30AMP DC power supply with digital meters.I hope it works fine
under low ambient temperatures (-15C or 5F).
The specs say its operating temperature is 0C - 50C, so -15C _might_ be an issue. I can't find any specs for my Pyramid PS32LAB, but I've used it at temperatures below -20C (-5F) with no problems.

My Pyramid is mounted on a bracket attached to the pier, near the floor. To prevent accidental bumps from changing the voltage-setting knobs, I attached a thin piece of wood in front of the knobs. See <http://astronomy.mdodd.com/observatory.html#EquipmentHolder>

--
Mike

Mike Dodd
http://astronomy.mdodd.com
Louisa County, Virginia USA


Robert Berta
 

I have the PowerWerks 30 amp power supply with meter. Thus far no problem here in Michigan where it does get a bit cold. Previously I used the PowerWerks smaller model without meters for around 15 years and it still works fine (now use both). I suppose you could put an insulated box around it or even a cobbled up heater from a dew heater if you are concerned.


Mike Dodd
 

On 12/13/2018 9:23 PM, biker123@att.net [ap-gto] wrote:

I suppose you could put an insulated
box around it or even a cobbled up heater from a dew heater if you are
concerned.
I made a heater for my observatory PC by installing a terrarium heater with a thermostat in a wooden enclosure. The PC sits on the open top. See <http://astronomy.mdodd.com/observatory.html#Heater>

Something similar but larger would keep a power supply warm.

--
Mike

Mike Dodd
http://astronomy.mdodd.com
Louisa County, Virginia USA


Robert Berta
 

Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 


Christopher Erickson
 


On Thu, Dec 13, 2018 at 5:03 PM biker123@... [ap-gto] <ap-gto@...> wrote:


Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 


Mike Dodd
 

On 12/13/2018 10:02 PM, biker123@att.net [ap-gto] wrote:


Not sure about an aquarium heater....wouldn't that need to sit in
water?
I wrote "terrarium" not "aquarium." See the photo I linked to. This is a ceramic disk with an embedded heating element that screws into a standard light socket.

--- Mike


Christopher Erickson
 

And yes, I know that the original poster mentioned terrarium heater, not aquarium heater.  Completely different thing.
 
My comment is specifically related to aquarium heaters since they were mentioned in a reply.
 
 
-Christopher Erickson
Observatory engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com
 



From: Christopher Erickson [mailto:christopher.k.erickson@...]
Sent: Thursday, December 13, 2018 5:18 PM
To: ap-gto@...
Subject: Re: [ap-gto] Re: AC-DC Power supply for AP Mach1 GTO CP4


On Thu, Dec 13, 2018 at 5:03 PM biker123@... [ap-gto] <ap-gto@...> wrote:


Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 


Virus-free. www.avg.com


Roland Christen
 

Oh My! That sure looks crispy.

Rolando



-----Original Message-----
From: Christopher Erickson christopher.k.erickson@... [ap-gto]
To: ap-gto
Sent: Thu, Dec 13, 2018 9:18 pm
Subject: Re: [ap-gto] Re: AC-DC Power supply for AP Mach1 GTO CP4




On Thu, Dec 13, 2018 at 5:03 PM biker123@... [ap-gto] <ap-gto@...> wrote:


Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 




Roland Christen
 

I like to run all my stuff at 12 volts, so I would just use a Kendricks dew heater strap and wrap it around anything that I want to warm up. Set the control to a low setting and it will keep things from freezing.

Rolando



-----Original Message-----
From: Mike Dodd mike@... [ap-gto]
To: ap-gto
Sent: Thu, Dec 13, 2018 9:46 pm
Subject: [ap-gto] Re: AC-DC Power supply for AP Mach1 GTO CP4

On 12/13/2018 10:02 PM, biker123@... [ap-gto] wrote:
>
>
> Not sure about an aquarium heater....wouldn't that need to sit in
> water?

I wrote "terrarium" not "aquarium." See the photo I linked to. This is a
ceramic disk with an embedded heating element that screws into a
standard light socket.

--- Mike




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Carl Brosius
 

I have very successfully used a boat dehumidifier for 10 years in my rolling roof observatory. 
Carl 

. Fantastical interpretations of my perfect spelling courtesy of Apple. 


On Dec 13, 2018, at 7:18 PM, Christopher Erickson christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:

 


On Thu, Dec 13, 2018 at 5:03 PM biker123@... [ap-gto] <ap-gto@...> wrote:


Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 


Ron Kramer
 

You could - I'd pass
I use these. 
https://www.circuitspecialists.com/csi25sw-d.html


On Fri, Dec 14, 2018 at 1:35 AM Carl cbfuture2061@... [ap-gto] <ap-gto@...> wrote:
 

I have very successfully used a boat dehumidifier for 10 years in my rolling roof observatory. 

Carl 

. Fantastical interpretations of my perfect spelling courtesy of Apple. 


On Dec 13, 2018, at 7:18 PM, Christopher Erickson christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:

 


On Thu, Dec 13, 2018 at 5:03 PM biker123@... [ap-gto] <ap-gto@...> wrote:


Not sure about an aquarium heater....wouldn't that need to sit in water?  I have used a gun safe heater to keep areas under cover warmer and fight condensation. They are pretty cheap (around $25) and are simply a 1' piece of aluminum tubing about 1" in diameter with a heating element inside. There is no adjustment for heat but the standard setting works fine.  Bear in mind if you have this or any heat source in the vicinity of the telescope the heat currents may mess up your seeing. 


Joe Zeglinski
 

Ron,
 
    Your linked article describes their product as strictly a “BENCH TOP switching power supply”, with no mention  of its operating temperature range, (obviously, not required), if used outdoors – or even if is safe to do so. The specs only mention “over temperature” protection by an automatic fan, but what about warranty at below freezing?
 
    Guess, as usual, we astronomy hobbyists just take our chances with consumer use intended products. But, having operating temperature specs would be more reassuring, and even protect the company from legal liability.
 
    Actually, it looks similar to the Powerwrx supply. Maybe it is a relabelled version.
 
Joe


Diego Gomez
 

Hello All,

Well, the power supply won't be completed exposed to the elements. I will place it, along with another one which I use to power up all my other accessories, inside of a fishing box. When operating, these two power supply should produce enough heat to keep the box warm enough to avoid dew or frost around them.

I have seen many electronic components such as laptops, cameras, USB Hubs, autofocusers where their manufacturer state that the lowest operating temperature is zero degree celsius and yet we have been able to operate them below this value without problems. I guess, the real danger is to try to operate them if they are wet due to dew formation but the low temperature itself shouldn't be a problem.

Anyway, we will see how it will go!

Cheers,
Diego