12 replies to this topic

[buckeyestargazer]

My observatory power supply died last night.  Not surprising given it is probably 15 years old.  So I'm looking to buy another "12v" regulated power supply and although there are lots of options all of them that I have seen have an operating minimum temperature of 0C.  It's not unusual for me to see -20C in the winter.  Is that something to be concerned about?

 

Recommendations for a 10A minimum power supply to run mount, camera, dew straps etc (max draw is about 3.5A)?

[Nemo51]

Look for power supplies built from server components. The radio control crowd uses them to drive lipo chargers and they are bulletproof. Here is an example. https://www.rlpower.net
 

I use one in all conditions. 

[Nemo51]

Dyi

 

https://oscarliang.c...po-charger-psu/

[Kitfox]

If you’re after a battery power supply, the Jackery line is rated to -10. I have a feeling they have a fudge factor built in, but I’d still dig a “root cellar” to keep it out of those elements!  And make it big enough to for you, too!

[buckeyestargazer]

If you’re after a battery power supply, the Jackery line is rated to -10. I have a feeling they have a fudge factor built in, but I’d still dig a “root cellar” to keep it out of those elements!  And make it big enough to for you, too!

I have a LiFePO4 battery supply that I use when traveling, but I don't necessarily want to use it all the time at my home observatory.  

[Nemo51]

Another. https://www.rchelico...00pb-build.html
 

[AbsolutelyNot]

I use the Pyramid brand PSUs.  They stay outside 24-7, 365, and are often in use in -20° C weather.  Pricey but bullet-proof.

[Mert]

Maybe ( as an idea ) try a small switching power supply, easy to get a 12v 20 amp. or more.
You can add a small 12V cabinet heater to assure it works when temps are low.

Edited by Mert, 05 December 2022 - 06:04 PM.

[aaube]

Joel,

 

I have a few of these in the observatory. 

Never had a problem in winter.

 

Alain

[badgie]

Although not technically rated for outdoor use, I've been very happy with this 12v 10A DIN Rail mounted ps.  I installed a short din rail to my mount and I can pop it on and off as needed.  Rated to -20C 

 

Or you can look at something like an IP 67 outdoor rated power supply if you prefer.

[buckeyestargazer]

Thanks for the ideas all.  I decided to just try a typical bench adjustable regulated power supply.  Although the minimum temp rating is only 0C, my guess is that doesn't really matter much since electronics tend to like cold temps.  The equipment line will be fused as well.  

[calypsob]

Thanks for the ideas all. I decided to just try a typical bench adjustable regulated power supply. Although the minimum temp rating is only 0C, my guess is that doesn't really matter much since electronics tend to like cold temps. The equipment line will be fused as well.

I was going to suggest a low noise linear power supply.
They are very heavy and not efficient electrically but if cold temperature is your concern, the warm transformer will never allow the unit to get that cold.

https://www.ebay.com...emis&media=COPY

For those on 220

https://www.ebay.com...emis&media=COPY

Edited by calypsob, 06 December 2022 - 04:29 PM.

[cfosterstars]

This is the one I use. Very small and light weight.

 

https://powerwerx.co...al-meters-30amp