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Join Date: Jan 2011
Posts: 17

Batteries Calculation Design

02/23/2011 5:33 AM

How we know how much batteries or DCvoltage require for differnt types of UPS ratings

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Guru
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#1

Re: Batteries calculation design

02/23/2011 5:43 AM

Ask the UPS manufacturers.

With the information you've given you can't expect an answer.

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Active Contributor

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Posts: 17
#2
In reply to #1

Re: Batteries calculation design

02/23/2011 6:11 AM

enen if we have 5 KVA UPS DC voltage require 108 V. But the same 5 Kva some manufacturers are using 430 V Dc also who will decide those things what is the factor to be considered

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Anonymous Poster
#3
In reply to #2

Re: Batteries calculation design

02/23/2011 6:41 AM

Study Ah of battery.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#4
In reply to #2

Re: Batteries calculation design

02/23/2011 6:46 AM

Talk to the UPS manufacturer.

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Guru
India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

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#5
In reply to #2

Re: Batteries calculation design

02/23/2011 7:06 AM

For same power ratings you can have different input voltage requirements, if you choose lower input voltage AH rating of battery required will be higher, with the law of proportion.

Energy required to lift 10kg stone to 1 meter height= Energy required to lift 1kg stone to 10 meter height, (g is constant)

Note- in general higher input voltage UPS are more efficient,

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Guru

Join Date: Dec 2010
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#6

Re: Batteries Calculation Design

02/23/2011 6:24 PM

Adding to post #5, higher voltages make the UPS more efficient. The cost of a given watt-seconds capacity in a battery of a type is usually lower with a smaller number of cells - there is less weight and space used on casings and interconnections rather than plates and electrolyte. This has to be balanced against the economies of a higher voltage and the possibility that a higher voltage system can be more powerful and more efficient.

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Power-User
Engineering Fields - Power Engineering - New Member

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#7

Re: Batteries Calculation Design

02/25/2011 8:08 PM

battery rating is determined by its voltage output and the amp-hour capacity, likewise your design must be made in the needed outputs mentioned above...the ones that matter later on is with the ampere output of your charger which supplies your components on a normal basis...your battery automatically take over when charger input is out...

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