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853 posts

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# 248763 8-Apr-2019 21:18
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I am thinking of a 600va or 650va UPS from Digitus or Dynamix.

 

Sizing a UPS is like asking how long is a piece of string...

 

A 600va UPS has a 12v 7ah battery, therefore 12v x 7Ah = 84wh.

 

My ONT, UFB router, WiFi router, phone Ata and phone uses about 24w.

 

So by my rough calc is 84wh/24w = 3 hours of run time.

 

This would be more that enough time based on power outages I have seen in recent years.

 

Am I on the right track?

 

Battery laptop would take over from my mains powered desktop during a power outage.

 

TIA.

 

 





Gordy


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  # 2213283 8-Apr-2019 21:21
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No need to convert to and from 230V, get one of these. They have two outputs, but you can probably make yourself a cable that will do the job, or they might make you a cable if you pay them. There's plenty of threads that talk about it, I have one and it works well. I use a 8AH battery for backup against short outages. I have a few 30AH batteries and a moderate sized solar cell in case of disaster.


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  # 2213284 8-Apr-2019 21:22
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You are forgetting the terrible efficiancy of the inverters in UPS's which is why they overheat so badly, I would say hour if you were lucky.




Richard rich.ms

 
 
 
 




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  # 2213288 8-Apr-2019 21:32
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I did think of a Sentry Lite...

 

My gear I want to keep alive includes  2x 12v, 2x 5V and 1x 6.5v power adapters,

 

A Sentry Lite has 2x 12v outputs which would require extra regulators of some sort.

 

So using a mains output UPS would keep my options simple. I am getting lazy in my old age :-)

 

 

 

 

 

 

 

 





Gordy


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  # 2213297 8-Apr-2019 21:51
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i would look at splitting what you need powered and what you would like powered..

 

 

 

Personally i power my routers, modems and a single low powered AP plugged centrally where people congregate when power is out.

 

Leaving all my higher powered enterprise AP's, managed switch etc all to simply go on a low end UPS that i expect will fall over in no time.

 

 

 

a script on the main router enables wifi AP on the low powered AP when there is no connection to the other access points so it self manages the onboarding part.

 

 

 

All the devices run off 12V battery power from there with enough to last a good day. no point in sizing above that as the dslam is viewed as non critical and thus not put on generator backups.





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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


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  # 2213299 8-Apr-2019 21:56
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hio77:

 

no point in sizing above that as the dslam is viewed as non critical and thus not put on generator backups.

 

 

Dslam? how quaint!

 

 

OP said ONT so they are not cursed by that treatment of internet as second rate service. I have ordered and are waiting on some of those plugs for the ONT to arrive so I can make something up to plug into it if there is an extended outage.




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  # 2213302 8-Apr-2019 22:20
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richms:
hio77:

 

no point in sizing above that as the dslam is viewed as non critical and thus not put on generator backups.

 

Dslam? how quaint! OP said ONT so they are not cursed by that treatment of internet as second rate service. I have ordered and are waiting on some of those plugs for the ONT to arrive so I can make something up to plug into it if there is an extended outage.

 

somehow i'm surprised you havent begged and pleaded to convince a third gen into your place....

 

 

 

far easier with a standard 12v dc jack





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.




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  # 2213306 8-Apr-2019 22:36
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I am re-thinking about the Sentry Lite option.

 

Nicegear has a variety of SMPS modules that I could hook up to 12v.

 

For example here is a 5v 2.5a smps module:

 

https://nicegear.nz/product/pololu-5v-25a-stepdown-voltage-regulator-d24v25f5

 

I will look for something that will suit my 6.5 volt requirement.

 

 





Gordy


 
 
 
 


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  # 2213321 9-Apr-2019 06:45
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After mucking about for years with small UPS's that always disappoint I've finally found a solution that is affordable and gives very long run time -

 

https://www.aliexpress.com/item/500w-1000w-1500w-2000w-2500w-3000w-ups-12v-220v-power-inverter-1kva-inverter-with-charger/32856831739.html?spm=a2g0s.9042311.0.0.58a94c4ddXeEX9

 

This plus a 12v lead acid battery of your choice and you are good to go. While I've only had this running for a whole 24h, I'm happy its exactly what I need. They also have bigger/smaller ones and pure sine wave as well but the basic modified sine wave seems to be powering my collection of micro-servers, routers and switches fine with no fan needed and no appreciable heat.

 

 

 

 


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  # 2213327 9-Apr-2019 07:51
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Gordy7:

I am re-thinking about the Sentry Lite option.

 

Nicegear has a variety of SMPS modules that I could hook up to 12v.

 

For example here is a 5v 2.5a smps module:

 

https://nicegear.nz/product/pololu-5v-25a-stepdown-voltage-regulator-d24v25f5

 

I will look for something that will suit my 6.5 volt requirement.

 

 

 

 

I'd give serious consideration to the Sentry Lite. Constant Vigil customised my unit for my power requirements at no additional cost. In my case I required 12V input which is below the standard switch to battery voltage of 12.9V, and uses a 6V battery instead of 12V (standard cut off 11.1V).

 

 

I would probably use the standard unit in your case along with a 5V SBEC for remote controlled aircraft. These seem to be quite efficient, handle a wide range of input voltages and can deliver a fair amount of current. I use one to power a Raspberry Pi (ADS-B receiver) on the roof via a 12V PoE adaptor, and used another to power a ComputeStick attached to the back of a monitor via a common power supply.

 

 

I don't have a tidy solution for 6.5V. I'd probably use an adjustable step-down unit for that one.



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  # 2213332 9-Apr-2019 08:11
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SirHumphreyAppleby:

 

 5V SBEC for remote controlled aircraft.......  I don't have a tidy solution for 6.5V. I'd probably use an adjustable step-down unit for that one.

 

Thanks... A quick look at Hobby King for a 5v SBEC.... On the first one I looked at I see there is a jumper option for 5v or 6v.... 6v might be enough for my 6.5v requirement for my Panasonic desk phone.





Gordy


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