Calculating UPS/INVERTER Battery Backup:
Before calculating the Battery Backup, let us know a few factors that vary battery backup.
For and UPS with 875Va we can us a maximum load of 640 watts
677Va we can us a maximum load of 540 watts
The main thing we have understand is that what ever may be the UPS wattage the battery backup will not vary. The battery backup will only vary depending on the battery Ah and the Usage Load.
To calculate UPS backup, We have a simple formula.
UPS Backup = Battery Ah * (Volts/Load) * (1/Powerfactor)
Example: Let us calculate the backup for a system UPS
Load is the usage power, suppose we are running a PC then the load is around 300 watts
Power Factor varies for device to device, the average power factor is 1.4
Voltage is the voltage of the battery.
For a single battery the voltate is 12v.
If the batteries are connected in a series Voltage = 12 * no. of batteries.
Battery Ah is the battery ampere used for the ups,
System UPS battery AH is 7
Then Battery Backup = 7 * (12/300) * (1/1.4)
= 7 * (0.04) * (0.7)
= 0.19 hours
= 19 Minutes
Note: You can use the same formula for calculating the battery backup for home UPS or an INVERTER.
Before calculating the Battery Backup, let us know a few factors that vary battery backup.
For and UPS with 875Va we can us a maximum load of 640 watts
677Va we can us a maximum load of 540 watts
The main thing we have understand is that what ever may be the UPS wattage the battery backup will not vary. The battery backup will only vary depending on the battery Ah and the Usage Load.
To calculate UPS backup, We have a simple formula.
UPS Backup = Battery Ah * (Volts/Load) * (1/Powerfactor)
Example: Let us calculate the backup for a system UPS
Load is the usage power, suppose we are running a PC then the load is around 300 watts
Power Factor varies for device to device, the average power factor is 1.4
Voltage is the voltage of the battery.
For a single battery the voltate is 12v.
If the batteries are connected in a series Voltage = 12 * no. of batteries.
Battery Ah is the battery ampere used for the ups,
System UPS battery AH is 7
Then Battery Backup = 7 * (12/300) * (1/1.4)
= 7 * (0.04) * (0.7)
= 0.19 hours
= 19 Minutes
Note: You can use the same formula for calculating the battery backup for home UPS or an INVERTER.
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There's a calculation error in the post. 0.19 hours is not 19 minutes. One hour is not composed of 100 minutes but 60 minutes only. So the calculation should be 60*0.19 which is equal to 11.4 minutes.
ReplyDeleteAnd also the power consumption of average modern computers with LCD monitors is much less than 300W.
friend .. i think there is correction in your formula....
ReplyDeleteaccording to my calculation.... back up = (volt* current* hour)/(volt*current)
ie. = (volt*curent*hour)/(watt/powerfactor)
= (volt*current*hour*powerfactor)/(watt)
i.e = (battery voltage* battery AH* powerfactor)/load
Hello,
ReplyDeleteNice piece of information you have here.
I think there is a correction thou,
0.19hrs should translate to = 0.19*60=11.4 minutes.
this post is helpful and informative.
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how come 0.19 hours = 19 minutes ??
ReplyDeleteNice formula for battery backups. Only long lasting battery backups can make a UPS successful. Emerson network power is one of the best manufacturing and supplier company in the world which makes best UPS and supplies in India along with other countries. Visit UPS supplier in India to know its qualities and prices.
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ReplyDeleteHow do u decide the power factor ? Pls explain !!!!
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ReplyDeleteHi ,
ReplyDeleteNice work still few things I would like to explain .
Consider the power factor of Not only UPS but also for batteries .example.
1000 va output will be 700 watts
700 watts/.85 = x ▶ invt eff.
X/.65= Y▶ batt. Eff.
Y/Vdc = Z ▶ vdc is no. Of batteries x volt of battery.ex 12 volt x 3 battery= 36 vdc
So Z x (Backup time needed ) say 3 hrs
So for example it comes 15
Multiply by 3 hrs
So backup is 45 Ah
HENCE , 3 BATTERIES ARE NEEDED FOR A 700 WATT LOAD ON A 3 BATTERY SYSTEM (36 VDC) for 3 hrs backup.
Mail me at : amit@elnova.com
www.elnova.com
,
Nice work still few things I would like to explain .
Consider the power factor of Not only UPS but also for batteries .example.
1000 va output will be 700 watts
700 watts/.85 = x ▶ invt eff.
X/.65= Y▶ batt. Eff.
Y/Vdc = Z ▶ vdc is no. Of batteries x volt of battery.ex 12 volt x 3 battery= 36 vdc
So Z x (Backup time needed ) say 3 hrs
So for example it comes 15
Multiply by 3 hrs
So backup is 45 Ah
HENCE , 3 BATTERIES ARE NEEDED FOR A 700 WATT LOAD ON A 3 BATTERY SYSTEM (36 VDC) for 3 hrs backup.
Mail me at : amit@elnova.com
www.elnova.com
Hi ,
ReplyDeleteNice work still few things I would like to explain .
Consider the power factor of Not only UPS but also for batteries .example.
1000 va output will be 700 watts
700 watts/.85 = x ▶ invt eff.
X/.65= Y▶ batt. Eff.
Y/Vdc = Z ▶ vdc is no. Of batteries x volt of battery.ex 12 volt x 3 battery= 36 vdc
So Z x (Backup time needed ) say 3 hrs
So for example it comes 15
Multiply by 3 hrs
So backup is 45 Ah
HENCE , 3 BATTERIES ARE NEEDED FOR A 700 WATT LOAD ON A 3 BATTERY SYSTEM (36 VDC) for 3 hrs backup.
Mail me at : amit@elnova.com
www.elnova.com
,
Nice work still few things I would like to explain .
Consider the power factor of Not only UPS but also for batteries .example.
1000 va output will be 700 watts
700 watts/.85 = x ▶ invt eff.
X/.65= Y▶ batt. Eff.
Y/Vdc = Z ▶ vdc is no. Of batteries x volt of battery.ex 12 volt x 3 battery= 36 vdc
So Z x (Backup time needed ) say 3 hrs
So for example it comes 15
Multiply by 3 hrs
So backup is 45 Ah
HENCE , 3 BATTERIES ARE NEEDED FOR A 700 WATT LOAD ON A 3 BATTERY SYSTEM (36 VDC) for 3 hrs backup.
Mail me at : amit@elnova.com
www.elnova.com
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