Buying a UPS

verge said:
I have checked under the modem - Power input: 12 - 15V and 1.2 - 0.9A. (Further it also states - Power Consumption: 13.5W (MAX)

Now that I know there is a Communica branch in Woodstock I can buy the Powermax unit (thank you Tinuva). Thank you Isheed for the simple calculation. I am going to get a lead crystal battery.

Can anyone please confirm that I do not need to worry that the Amps produced by the Powermax is higher than what the modem can take.

I am also considering adding a 12V LED light - what A do they typically use - would this mean that I should get a larger battery?
Click to expand...

You don't need to worry about the amps. The unit delivers a constant voltage and the device draws the current it needs, nothing more. You only need to worry if you try and draw more current than the unit can deliver.

We have LED floodlights outside the house, and they are 10W. So you can use a lot smaller one for inside. The extra battery depends on the time you want it to run. The problem is if you have a big battery and frequent loadshedding, the battery won't be fully charged every time. I have an old 45 Ah battery, so I can run for a long time without power, but not every day. Then I will need to take off the battery and use a normal charger to get it back to full capacity.

Will those emergency lights not work better that you leave plugged in and they switch on automatically if the power goes off?
 
@Admin
Is this thread dead? (the last post was on the 21st, and today is Sunday 26th). I'm thinking of getting a battery/inverter backup and I would like to post my ideas and get feedback. This is such an important topical subject. Must I start a new thread or post here?
 
mwill said:
@Admin
Is this thread dead? (the last post was on the 21st, and today is Sunday 26th). I'm thinking of getting a battery/inverter backup and I would like to post my ideas and get feedback. This is such an important topical subject. Must I start a new thread or post here?
Click to expand...

Nah. Check here: http://mybroadband.co.za/vb/showthread.php/695330-Modifying-small-UPS

Busy working on finishing my post. It will be completed when I feel like it. Enough there in the meantime...
 
Thanks for that quick reply :-) Reading the other thread now.
 
Guys, why is this thread so quiet.

Anyways, me looking for 2x batteries as usual. Was hoping to go lead acid, but too price I guess. What about going 2x 65ah lead acid with my ups on a load of about 300w.
 
KOPITE said:
Guys, why is this thread so quiet.

Anyways, me looking for 2x batteries as usual. Was hoping to go lead acid, but too price I guess. What about going 2x 65ah lead acid with my ups on a load of about 300w.
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Something doesn't compute?

Also, how long do you want to run that 300W?
 
Joker said:
Is there software for that, or would I need a multimeter?
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Or you can skip all the hassle and check APC's website for that model. They also have a calculator somewhere. for that model, a 200W power draw will give you about 30 minutes, 500W about 10 minutes. So you won't be able to game off the UPS, but you might be able to browse a bit. Also remember the monitor power use.
 
Joker said:
Would this power a 1000watt PC for 2 hours, are there better alternatives for that price?

APC Power-Saving Back-UPS Pro 1500 - 230V BR1500GI
Click to expand...

Google for "APCRBC124 specs" which is the batteries this UPS use. Looks like 2x 12v batteries of 7.5 to 9ah. Which is almost nothing. That will power a 1000w pc, that lets say uses 300w with monitor when not gaming, you can do the maths, but it will last you probably less than 20minutes.

What you really want is a power inverter that have ups like function. It will cost a lot more, but will last through 2 hour loadsheddings.

Examples:
- Crystal IX inverter system
- Ellies 1200w power inverter system
- Mecer 1440w inverter

Any system that uses at least 2x 102ah batteries is what you are looking for, to let a 1000w system survive 2 hours. You may want to look at something bigger possibly, but I doubt your pc will pull a full 1000w, but if it really does, go slightly bigger.
 
Hi all - I am totally clueless with regards to this and was hoping to get an idea with what UPS I would need to power my wireless router and modem for approximately 4hrs?

I have the following equipment:
Asus RT-AC66U Wireless Router
D-Link DSL-2500U Modem

I won't be needing to power anything else

Edit: Just checked the spec sheets of the 2 items and it seems that their current ratings are as follows:
Asus: 19V 1.58A
D-Link: 5V 1A

Been looking at an APC UPS but have no idea what I'll be needing to run my equipment. had a look at their calculator and they recommend this one:

APC Back-UPS RS BR900Gi 540 Watts / 900 VA and that it will run for 275mins
 
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MikyMouse said:
Hi all - I am totally clueless with regards to this and was hoping to get an idea with what UPS I would need to power my wireless router and modem for approximately 4hrs?

I have the following equipment:
Asus RT-AC66U Wireless Router
D-Link DSL-2500U Modem

I won't be needing to power anything else

Edit: Just checked the spec sheets of the 2 items and it seems that their current ratings are as follows:
Asus: 19V 1.58A
D-Link: 5V 1A

Been looking at an APC UPS but have no idea what I'll be needing to run my equipment. had a look at their calculator and they recommend this one:

APC Back-UPS RS BR900Gi 540 Watts / 900 VA and that it will run for 275mins
Click to expand...

The APC units are supposed to be really good. That looks about right for what you want to use.

I don't know what your setup is, but if you can run one router/modem combo it will cut the requirements for your UPS significantly.
Asus: 30W max
D-link: 5W max
So you need 35W max power from your UPS. My Netgear modem needs 18W (12V 1,5A) max, that is half of your setup.
 
furpile said:
The APC units are supposed to be really good. That looks about right for what you want to use.

I don't know what your setup is, but if you can run one router/modem combo it will cut the requirements for your UPS significantly.
Asus: 30W max
D-link: 5W max
So you need 35W max power from your UPS. My Netgear modem needs 18W (12V 1,5A) max, that is half of your setup.
Click to expand...

From this how do i calculate which ups and it's runtime?

PS: I am only wanting to run these 2 devices and nothing else
 
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rsifan said:
That calculation you did on the APC website is correct.
Click to expand...

Thanks :) Bit of an expensive unit to power just my Router and Modem, but I guess that's what it will take.

While talking about this particular unit - I presume that I can add other equipment to it as needed just making sure that the draw doesn't exceed 540W? Obviously the battery life would be reduced significantly
 
MikyMouse said:
Thanks :) Bit of an expensive unit to power just my Router and Modem, but I guess that's what it will take.

While talking about this particular unit - I presume that I can add other equipment to it as needed just making sure that the draw doesn't exceed 540W? Obviously the battery life would be reduced significantly
Click to expand...

We have one of those APC units here at the office. They're very good, had it for 5 years - the battery crapped out a few months ago but got a replacement battery for under R800.

Just try to never run the batteries down completely, if you do this often it's going to seriously shorten the lifespan of the battery.
 
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