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Formula Help
- Thread starter camilo123
- Start date
josepablomir
IS-IT--Management
One thing is the voltage, which is measured in Volts. Of course the UPS should be of the same voltage than the load it will power. For example 120 or 208 volts.
About the power, KVA (apparent power) you should select an UPS at least with the same power capacity. It is recommended to select a bigger unit, for tolerance and future grown.
Keep in mind that loads like computer never, or at least almost never, have a power requirement equal to the one derived from the back plate. The values the manufacturer gives are maximum values, and if you select an UPS to power 10 desktop computers which indicates in the back plate a current of 5 amps, you are going to end up purchasing a 6 KVA UPS, when the value more appropriated for this 10 computers should be not more than 2 KVA.
If you have to purchase an UPS for a large amount of equipment maybe is wise to purchase a True RMS Clamp Metter (Fluke has good ones for around $200) and measure the power needed (add an extra percentage for tolerance and future grow).
Regards,
_________________
Jose P. Mir
jpm@jpmir.net
About the power, KVA (apparent power) you should select an UPS at least with the same power capacity. It is recommended to select a bigger unit, for tolerance and future grown.
Keep in mind that loads like computer never, or at least almost never, have a power requirement equal to the one derived from the back plate. The values the manufacturer gives are maximum values, and if you select an UPS to power 10 desktop computers which indicates in the back plate a current of 5 amps, you are going to end up purchasing a 6 KVA UPS, when the value more appropriated for this 10 computers should be not more than 2 KVA.
If you have to purchase an UPS for a large amount of equipment maybe is wise to purchase a True RMS Clamp Metter (Fluke has good ones for around $200) and measure the power needed (add an extra percentage for tolerance and future grow).
Regards,
_________________
Jose P. Mir
jpm@jpmir.net
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