Can i use 9ah Batteries instead of 7ah Batteries in the UPS?

[Ivan the SoSo]

Those inverters are kinda expensive Amazon.com: Power Bright ERP1500-12 220V-50 Hz Power Inverter - European Models: Patio, Lawn & Garden

But might end up being the best long term solution:huh:

Now if he runs his system off US 110-60hz the inverter are cheaper....

 

[Britton30]

And you'd need some circuits to switch the PSU on when it senses no power.

 

[Ivan the SoSo]

And you'd need some circuits to switch the PSU on when it senses no power.

If you have a strong enough float charger you could just run the system off the inverter....No worries about power surges

 

[boogieboy]

...but in my country the power-failure doesn't happen once in a while coz it's going on daily-basis and on scheduled time...

If the power goes out on a schedule, wouldn't it make sense to shutdown the PC when it gets close to that time instead of waiting for the PC/UPS to die?
You can schedule a message to remind you and/or shutdown the PC with a scheduled task.

It goes on schedule and they change times every now and then also if there's raining or heavy winds blowing so power-failure happens anytime for 2 mins, 10 mins or in simple words you never know in Pakistan what's gonna happen with the lights

 

[boogieboy]

What current does your computer run on?

you mean 110 or 220? we have 220 there.

 

[gerry7]

I can get them but my UPS does not support External Batteries and it is mentioned in the booklet that do not attach external batteries and you may damage the ups or something like that...

i also wanna know that my UPS running 2 12v batteries @ 24v probably so can i use 6v batteries lets say 4x 6v batteries with some good ah's?

9Ah batteries of the same quality will last longer than 7Ah batteries. They can age and lose capacity and still meet a 7Ah batteries spec.

If the UPS is not designed for external batteries, it may well overheat before the battery is depleted if high capacity external battery is used. Also, you need very heavy gauge wire to prevent voltage drop.

UPS for most non server computers are NOT designed to be constant load inverters! Thus the risk of overheating.

 

[carwiz]

i can get them :d but my ups does not support external batteries and it is mentioned in the booklet that do not attach external batteries and you may damage the ups or something like that...

i also wanna know that my ups running 2 12v batteries @ 24v probably so can i use 6v batteries lets say 4x 6v batteries with some good ah's?

9ah batteries of the same quality will last longer than 7ah batteries. They can age and lose capacity and still meet a 7ah batteries spec.

If the ups is not designed for external batteries, it may well overheat before the battery is depleted if high capacity external battery is used. Also, you need very heavy gauge wire to prevent voltage drop.

Ups for most non server computers are not designed to be constant load inverters! Thus the risk of overheating.

This thread is over two years old!

 

[gerry7]

This thread is over two years old!

Actually I found this thread fairly quickly via Google, clearly it still has a high Google ranking and thus is still relevant.

Since it contained so much incorrect/unclear information (example - large external batteries on UPS units not designed for them) I felt it is still relevant. UPS systems and lead acid batteries have no changed much in the two years with the exception of a movement from Gel batteries to AGM (both lead acid) which are far more forgiving regarding charging and often are 9Ah with the same physical dimensions as the 7Ah+ Gel batteries and compatible with most UPS units that use the 7Ah+ batteries.

 

[badger906]

the higher the ampage the longer it will last, so you can technically use any battery that fits, the charger is most likely a trickle charge, thus only needing to match the batteries voltage to be sufficient to charge it.
ive jerry rigged an inverter with a 120A car battery in my shed for "emergencies" I just leave it on constant trickle charge via a car battery charger, im yet to even dent its capacity! my lights also run off of it!

 

[Up2NoGood]

Golf cart batteries would do a better job, they're heavier duty.

I'd consider a couple of 6V golf cart batteries in parallel, along with an appropriately sized inverter and a smart, 3-stage charger to maintain the batteries.

It does not work that way.. The relays inside the UPS unit will burn up. As they are designed to work for a short time. While you shut the items down. Why you see so many APC1500 with Fault Code 02. If the replacing the batteries does not fix it. I would add most UPS are 24 volt. Not 12 volts..so you would need 4x 6 volt batteries.

If you want to extend the run time. Just buy an Inverter. Add a 12 volt 100ah-200ah Battery. Then plug it into that..You would better served...