UPS with 12V DC output?

[Rickster]

Doesn't the exchange also require power in order to work?

 

[cjh]

OP: Check this out, we use them on wireless sites.

http://www.meanwell.com/search/AD-155/AD-155-spec.pdf

Will give your hours of runtime with correct battery

Eddie, is the output a regulated 12V or the battery's 13.8V, the spec sheet is a little vague? (Bottom right figure suggests 13.8V, but the table shows output voltage adjustable)

 

[Compton_effect]

I run a mikrotik and adsl router from a 650kva UPS (small cheap proline) and it lasted me well through a 2hour 15minute load-shed. Looking at the graphs I had for it at one point, it should be able to take me easily through a 4-5hour outage. Those 2 devices pull so little, that the UPS easily last, with it's inefficiencies and all.

Not sure how you guys get it to last only 25 min, mine lasts 20minutes if I have a PC on it yeah sure, but only DSL router + mikrotik and use it with a MacBookPro that can last 9h on it's own battery, I am good.

I have a cheap ass Zixaa from Matrix - it lasts3 and a half hours running a router, modem and cordless phone. Problem is - every damn shad we've had has been 4 hours!
(Shad - a new word I invented yesterday - derived from the word shed and past tense for **** )

 

[cjh]

I looked at the link from eddief1, but where would mere mortals like me (restricted to Kalahari and Takealot) procure such a device?

If you're in Joburg, Current Automation in Kya Sands has them

 

[Gnome]

My advice would be to just simply buy this:
http://www.ebay.com/itm/Mini-Box-pi...-/290963249122?pt=PCA_UPS&hash=item43bec2d7e2
Or if you have money to blow:
http://www.ebay.com/itm/OpenUPS-Any...-/191069383149?pt=PCA_UPS&hash=item2c7c9f69ed

It has a built in low capacity fast charger. (1.5a and 3a respectively)

Do not hook up your stuff directly to a battery charger:
- Almost all non-smart chargers use a simple transformer and rectifier (and in a cheap charger they only use two diodes, so that is half wave rectification)

What does this mean for you?
Simple, the voltage looks like full wave or half wave. High peeks and low valleys. Your volt meter will show you 15 volt but what you really have is 0v - 20+v peak to peak (too laze to calculate peek to peek but for a half wave rectifier this would be very bad). The average is 15 volt which is what you see on your volt meter.

They also typically skip capacitors, because well low ESR capacitors are expensive. What you end up with is a voltage source that could very easily fry your router depending on how forgiving the router internal power circuitry is.

Smart chargers really depend how they implement it. You have no guarantee that they are feeding DC into the battery. It may be saw tooth or some such wave form. I mean that is unlikely for a purpose built charger, but sometimes companies hack together all kinds of sh#t to save money.

For example APC UPS use the inverter in reverse with high capacity capacitors and the transformer as an inductor to build a crude boost circuit that shoves high voltage saw tooth into the battery.

 

[RyanPCMR]

http://www.scoopdistribution.co.za/product_info.php/12vdc-ups-444wh-4000mah-p-1661 - nice little device for small powered units.

What are the specs? Page not found

 

[Corbin]

Hey. Apologies for resurrection .

I just need a simple UPS to run 12V router during load*****ting for 1-2 hours.
This is the closest "clear" thread i could find. Anyone have a working setup ?.
I need a simple plug and work system.
No complex inverters , Dc this that. Im afraid hat gos over my head.

Also how do I get the 2 point plug connected ? I was thinking cutting a normal kettle plug and attaching a 2 way plug thing at the end. Then just use that as and alternative to where its plugged in now. Hope I making sense.

Tks

 

[Jimmy-Z]

Best bet is to check the back of the UPS. Mine has two 3 prong sockets, so I can plug a multiplug into it for the router & a LED power supply for some emergency lights

Hey. Apologies for resurrection .

I just need a simple UPS to run 12V router during load*****ting for 1-2 hours.
This is the closest "clear" thread i could find. Anyone have a working setup ?.
I need a simple plug and work system.
No complex inverters , Dc this that. Im afraid hat gos over my head.

Also how do I get the 2 point plug connected ? I was thinking cutting a normal kettle plug and attaching a 2 way plug thing at the end. Then just use that as and alternative to where its plugged in now. Hope I making sense.

Tks