1.2KVA UPS Battery Problem ? ( Will it explode or ... ) - Electronic Circuits Projects Diagrams Free

pasanlaksiri · 16th November 2007, 01:59 PM

Hi,

I have a 1.2KVA UPS. Now its 2 and half years old. It has Two, 12Volt 8.2AH batterys. So those batterys r now very weak. It cant hold much now.
My UPS is not a branded one also ( Power Tree ). Its cost me 81 USD.

So my question is, if I replace those batterys with big Capasity battery ( like one 45AH car battery ) actually what will happend ?

It will explode or Will it worke as usual ?

Thanks guys

**Nigel Goodwin** · 16th November 2007, 02:06 PM

It should work as normal, but just last for longer - the only concern is if the electronics are rated for the extended time? - it 'may' be under heatsinked because the batteries are specced to not allow it to run very long?.

But personally I'd stick the larger batteries on and try it!.

pasanlaksiri · 16th November 2007, 02:15 PM

Quote:

Originally Posted by Nigel Goodwin

It should work as normal, but just last for longer - the only concern is if the electronics are rated for the extended time? - it 'may' be under heatsinked because the batteries are specced to not allow it to run very long?.

But personally I'd stick the larger batteries on and try it!.

Ha Ha haaa... Then I must try it and see what happend.

pasanlaksiri · 16th November 2007, 03:27 PM

Hey when the battery is charging do u think it will charge like normal 8.2AH battery. ( my UPS is cheap Off Line Type )

And i have another proble. Actually what is da meaning of Amper Hours?

If I connect a 1Amp bulb to 8Ah battery, Light will light up for 8 hours. Is that the meaning of Amper Hours ? Or is there any other complicated explanation ?

**Nigel Goodwin** · 16th November 2007, 05:46 PM

Quote:

Originally Posted by pasanlaksiri

Hey when the battery is charging do u think it will charge like normal 8.2AH battery. ( my UPS is cheap Off Line Type )

It will just take longer to charge.

Quote:

And i have another proble. Actually what is da meaning of Amper Hours?

If I connect a 1Amp bulb to 8Ah battery, Light will light up for 8 hours. Is that the meaning of Amper Hours ? Or is there any other complicated explanation ?

That's basically it.

kchriste · 17th November 2007, 07:18 AM

Where I used to work 10yrs ago they had a large UPS backing up the the main paging terminal. There were 600Ah of batteries connected externally to boost the run time up to 48hrs in case of a pwr failure. Worked like a charm.

pasanlaksiri · 17th November 2007, 07:58 AM

Quote:

Originally Posted by kchriste

Where I used to work 10yrs ago they had a large UPS backing up the the main paging terminal. There were 600Ah of batteries connected externally to boost the run time up to 48hrs in case of a pwr failure. Worked like a charm.

I think those types of UPS r make for heavy work load.

**Nigel Goodwin** · 17th November 2007, 11:19 AM

Quote:

Originally Posted by kchriste

Where I used to work 10yrs ago they had a large UPS backing up the the main paging terminal. There were 600Ah of batteries connected externally to boost the run time up to 48hrs in case of a pwr failure. Worked like a charm.

Fine if cost is no object! - but I wouldn't like to think what that cost!.

Funnily enough, I was talking to a rep at work a few years back, and he used to work for a company that supplied UPS's and backup generators. One installation they had done was for 'Demon Internet', one of the first UK Internet suppliers - and they installed a large UPS system, along with an automatic generator. As a major ISP Demon were obviously VERY dependent on the power keeping on, so there was a strict penalty clause written in the contract.

Anyway, there was a MAJOR power outage, and as required by the contract Demon telephoned the company to inform them the generator was on and working fine. The rep I was talking to then realised that the fuel tank on the generator was only of 24 hour capacity - and the major outage was going to last longer then that. So he tried to arrange a diesel tamker to go and refuel it - couldn't be done - it was down a small alley way, with no access for a vehicle. Meanwhile, the clock was ticking down!.

In the end, he hired a van, went to a local cars accessories shop, and bought ALL their fuel cans - and put them in the van. He then drove a few hundred miles to London, filled the cans with diesel, drove to Demon - and carried the cans down the alley way to fuel the generator.

Apparently he got in big trouble with his company for doing this, yet he saved them a major law suite and compensation claim!.

EDGE · 17th November 2007, 04:15 PM

Thier Should Be No Problem Unless The Batteries Have Discharged Bolow A Set Threshhold The Charge Cuurrent Limit Circuit May Prevent The Oversized Batts From Charging ./ In Which Case You Have To Use A Seperate Charger Till You Get The Bats Up To Vol.tage Again.

Edge

kchriste · 17th November 2007, 08:23 PM

Quote:

Originally Posted by Nigel Goodwin

Fine if cost is no object! - but I wouldn't like to think what that cost!

It backed up the main paging terminal in the network. If it went down, the entire network would go down so cost wasn't an issue. Paging isn't as big today as it was back then when a reputation for coverage and reliability was everything.

Quote:

He then drove a few hundred miles to London, filled the cans with diesel, drove to Demon - and carried the cans down the alley way to fuel the generator.

Sounds like something my ex boss would have had us do. I've had my share of cold trips to the tops of mountains in the dead of winter to fix a duff repeater. Here are a couple of pics from a trip where the pilot tells us "Call right away if the weather appears to be getting worse or else I may not be able to come back for you today" just as we bail out into 6ft of snow:

pasanlaksiri · 18th November 2007, 04:48 AM

Quote:

Originally Posted by kchriste

It backed up the main paging terminal in the network. If it went down, the entire network would go down so cost wasn't an issue. Paging isn't as big today as it was back then when a reputation for coverage and reliability was everything.

Sounds like something my ex boss would have had us do. I've had my share of cold trips to the tops of mountains in the dead of winter to fix a duff repeater. Here are a couple of pics from a trip where the pilot tells us "Call right away if the weather appears to be getting worse or else I may not be able to come back for you today" just as we bail out into 6ft of snow:

Oh My God ! Its worth than life huh

pasanlaksiri · 18th November 2007, 05:07 AM

Hey, I connect my 45Ah car battery to my 1.2KVA ups. Then I switched it On and run it for 10 minuts without any load.

There is a small Bridge Rectifire, its getting very hot. So i replace it with this

After i test it with load for 20 mins [ 100W CRT and my pc ( 500W PSU ) ]. That bridge rectifire is also get hot but not that much. And it has some FETs with heat sink, those are get hot but not that much.

So now im going for buy a car battery for my UPS.

kchriste · 18th November 2007, 06:49 PM

Quote:

So now im going for buy a car battery for my UPS

Buy a deep cycle battery instead. Like the kind for RV's and boats. It'll last much longer in this application than an ordinary car battery.

pasanlaksiri · 18th November 2007, 06:56 PM

Quote:

Originally Posted by kchriste

Buy a deep cycle battery instead. Like the kind for RV's and boats. It'll last much longer in this application than an ordinary car battery.

No I changed my mind. Im going to buy MGE ups

kchriste · 18th November 2007, 08:19 PM

Quote:

Originally Posted by pasanlaksiri

Oh My God ! Its worth than life huh

It was more unpleasant than dangerous. There was power up there, the shack was heated and there was a generator with a weeks worth of fuel. The wind had blown most of the snow away from the shack but near where the helicopter landed was the 6ft snowdrifts. It was into the snowdrifts that our test equipment was dropped and we had to dig it out. Still, it was better than trying to drive up the mountain in the 4x4 and getting stuck or worse; careening off the cliff.

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16th November 2007, 01:59 PM	(permalink)
pasanlaksiri	1.2KVA UPS Battery Problem ? ( Will it explode or ... ) Hi, I have a 1.2KVA UPS. Now its 2 and half years old. It has Two, 12Volt 8.2AH batterys. So those batterys r now very weak. It cant hold much now. My UPS is not a branded one also ( Power Tree ). Its cost me 81 USD. So my question is, if I replace those batterys with big Capasity battery ( like one 45AH car battery ) actually what will happend ? It will explode or Will it worke as usual ? Thanks guys __________________ Digital Voltmeter PIC16F877 Audio CD Player My home made 2.1 System Nokia 3310 Lcd & Pic12F629 3 channel IR remote Controller Project using 12F Pic Pasan... Last edited by pasanlaksiri; 16th November 2007 at 02:02 PM.

16th November 2007, 02:06 PM	(permalink)
Nigel Goodwin	It should work as normal, but just last for longer - the only concern is if the electronics are rated for the extended time? - it 'may' be under heatsinked because the batteries are specced to not allow it to run very long?. But personally I'd stick the larger batteries on and try it!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

16th November 2007, 03:27 PM	(permalink)
pasanlaksiri	Hey when the battery is charging do u think it will charge like normal 8.2AH battery. ( my UPS is cheap Off Line Type ) And i have another proble. Actually what is da meaning of Amper Hours? If I connect a 1Amp bulb to 8Ah battery, Light will light up for 8 hours. Is that the meaning of Amper Hours ? Or is there any other complicated explanation ? __________________ Digital Voltmeter PIC16F877 Audio CD Player My home made 2.1 System Nokia 3310 Lcd & Pic12F629 3 channel IR remote Controller Project using 12F Pic Pasan...

17th November 2007, 07:18 AM	(permalink)
kchriste	Where I used to work 10yrs ago they had a large UPS backing up the the main paging terminal. There were 600Ah of batteries connected externally to boost the run time up to 48hrs in case of a pwr failure. Worked like a charm. __________________ --- The days of the digital watch are numbered. ---

17th November 2007, 04:15 PM	(permalink)
EDGE	Thier Should Be No Problem Unless The Batteries Have Discharged Bolow A Set Threshhold The Charge Cuurrent Limit Circuit May Prevent The Oversized Batts From Charging ./ In Which Case You Have To Use A Seperate Charger Till You Get The Bats Up To Vol.tage Again. Edge

18th November 2007, 05:07 AM	(permalink)
pasanlaksiri	Hey, I connect my 45Ah car battery to my 1.2KVA ups. Then I switched it On and run it for 10 minuts without any load. There is a small Bridge Rectifire, its getting very hot. So i replace it with this After i test it with load for 20 mins [ 100W CRT and my pc ( 500W PSU ) ]. That bridge rectifire is also get hot but not that much. And it has some FETs with heat sink, those are get hot but not that much. So now im going for buy a car battery for my UPS. __________________ Digital Voltmeter PIC16F877 Audio CD Player My home made 2.1 System Nokia 3310 Lcd & Pic12F629 3 channel IR remote Controller Project using 12F Pic Pasan...