How to connect 600VA UPS and charger to a single battery...

January 15, 2012 at 22:31:30
Specs: Windows 7
I want to increase the back up of my UPS of my computer and want to connect it to a normal car battery for longer backup.I have removed the battery of my 600va ups and connected to it lead acid car battery.UPS doesn't charge the bigger battery properly,is it possible if i connect the normal charger to the battery at the same time when UPS is connected.Can we connect UPS and the charger to the same car battery all the time without any problem and will it give good back up for my PC.(Use PC mostly for games and cant play them on my laptop.)

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January 15, 2012 at 22:48:24
The car battery is not being charged because the UP probably does not have enough output to do so. Connecting both the car battery and the UPS battery will only make matters worse.

I would caution against using a car battery inside. When charging a lead acid battery it gives of hydrogen which is explosive. I build up could cause a big bang. Batteries in UPS devices are sealed units designed for the purpose.

Bear in mind that a UPS is not meant as a substitute for mains power when the mains fails. It is only designed to provide sufficient power to give you time to do a controlled shut down.


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January 16, 2012 at 02:36:47
Car batteries and SLA batteries have different charging characteristics as well as slightly different voltage. What you need is an industrial rated ups, the home units don't have the heat sink and cooling capacity for long run cycles.

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January 16, 2012 at 09:30:48
I did try this in an outside shed with an old server ups. The test failed. I just wanted sometime power without having to put an extension cord. I didn't exactly have the 48 volts it needed either.

UPS systems are pretty smart. It may know the load or type of the battery in some sense circuit.

Chargers are slightly different but in some cases they can charge both.

Remember the flooded lead acid offers some dangerous reasons not to use it in a home or business. The acid is on creepy thing. It gets everywhere and crawls out of the battery so you usually keep them in a battery box. Second is the explosive gas (hydrogen) that is present.

Get a UPS that has the ability to offer external batteries and purchase the correct ones. It is not worth you life or home to play with this.

Katy Perry, I'd never treat you badly.

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January 21, 2012 at 21:10:08
thanks dear it was really helpful..
Purchased double back up ups and its circuit is made such will last for more than an hour,it is 1000va UPS.Will connect to it 28 Ampere sealed lead acid battery,when batteries go down in future.I think it should work on this ups,will go for ealed lead acid battery as per ur suggestion.Thankyou all...

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