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#1




Need Help To Calculate Battery Capacity for UPS
Hello All.
I'm new here. I need help to calculate battery capacity for UPS I planned. I want to buy a Inverter with UPS mode. The inverter have :  24VDC Input  220VAC 3000Watt Output  Eficiency 90% I need to have 6 or 12 hours backup time at Full Load (3000Watt). So how many AH (amps hours) I should prepare and how to calculate that ? What I know is I need to make 2 x 12V battery in serial to get 24V. Many thanks. 
#2




Re: Need Help To Calculate Battery Capacity for UPS
Quote:
That is what you need to draw, not the battery's rating. Even a deep discharge type battery should never be discharged to less than 20% of capacity, and 50% will result in much longer life. (Divide above by 0.8 or 0.5) Discharged to 20%: 1050 Ah for 6 h, 2100 Ah for 12 h To 50%: 1700 Ah for 6 hr, 3400 Ah for 12 h. Those are huge batteries and you may wish to consider a much smaller UPS battery supplemented by a generator. 
#3




Re: Need Help To Calculate Battery Capacity for UPS
Quote:
Wow....I need huge capacity Generator is my last option....smoke, noisy and the fuel price is rising and never stop Do you ever know how much is battery which have huge capacity which is used by most cellular provider at their BTS ? I saw battery with capacity over than 2000AH. Thanks. 
#4




Re: Need Help To Calculate Battery Capacity for UPS
Quote:
I don't know. Among people who live "off grid" and use solar or wind power, batteries rated for golf carts, generally 6V, 400 Ah, are popular and relatively economical. They wire four in series for 24 V, and either operate several separate banks or parallel them for more capacity (when paralleling batteries, there may be some problems getting all of them to charge/discharge uniformly, small differences in cell voltage can be a problem). 
#5




Re: Need Help To Calculate Battery Capacity for UPS
Thanks a lot....its very helpful for me.

#6




Re: Need Help To Calculate Battery Capacity for UPS
My load is 3KW & I want to take inverter. How I shuld decide battery capacity Pl. tell what should be battery capacity

#7




Re: Need Help To Calculate Battery Capacity for UPS
Quote:
Wiring would be ten parallel banks of four batteries in series. Charging with positive at first bank and negative at last bank is proper way to keep everything equalized. Major dollars here for a constantly deteriorating asset. Buy a lot of gas for that money, and it will be fresh with every fill up... 
#8




Re: Need Help To Calculate Battery Capacity for UPS
Quote:
Some simple maths: V A R & W A V and for the yanks E I R & P I E same **** just using the equality values but im going to explain in base value. Meanings: V=Volts A=Ampere R=Ohm's W=Watts Ohms law (1) Requires to part of the calculation so any one is able to do this all you need is a multimetre to start. Calculate: Volts: V= AxR Amps: A= V/R Ohms: R= V/A Working with watts: Watts: W= AxV Amps: A= WxV Volts: V= W/A Want an AH: Say with a single filament 24W at a 12V supply what AH do i need to run it for lets say 24hrs? Here now to put the above info into play: We need the amps that is being drawn from the 24W filament so: A=24/12 (2AMP) Now 24hr run time hrrm lets just think about this it aint that hard! So! 2A * 24HR = 48AH one thing to mention this is not for a deep charge battery! else add 20% to 48AH as we do not like to drain a deep plate as it f's it! I can't be stuffed typin anymore lol have fun with the new info 
#9




Re: Need Help To Calculate Battery Capacity for UPS
i want to run one sheeling fan and two tupe lights with 12 hours backup.so which battery is suitable for it and how make this calculation.thanking you

#10




Re: Need Help To Calculate Heat Dissipation for UPS
Hi,
I need help to calculate the total Heat Dissipation for a 20kva UPS. Many thanks. 
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