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UPS uninterruptible power supply - discharge time calculation method-KEBO power supply

by:KEBO      2020-04-04
< p > active power load x support time = battery discharge capacity * UPS battery voltage inverter efficiency < / p > < p > a. Basic formula: < / p > < p > active power load x support time = battery discharge capacity * UPS battery voltage inverter efficiency < / p > < p > among them: the active power of load = the power factor of load by total power load < / p > < p > UPS inverter efficiency material 0. 9 < / p > < p > nominal capacity battery discharge capacity = x battery discharge efficiency < / p > < p > the battery discharge efficiency associated with discharge current and discharge time, can consult the table below to determine: < / p > < p > 1 < / p > < p > b. Formula: < / p > < p > active power load * support time = the battery discharge capacity * * UPS battery voltage inverter efficiency. < / p > < p > c。 Calculation example: < / p > < p > example: load 3000 va, total power load power factor is 0. 7, UPS battery voltage 96 v, request support for 1 hour, should choose the battery capacity. < / p > < p > : < / p > < p > 3000 ( VA) ×0. 7×1( h) = the battery discharge capacity x 96 x is 0. 9 < / p > < p > the battery discharge capacity = UPS ( VA) ×0. 7×1( h) X 0 / battery voltage. 9 < / p > < p > = nominal capacity battery discharge capacity/discharge efficiency < / p > < p > it is concluded that: the battery discharge capacity = 24. 3 ( Ah) < / p > < p > = 24 nominal capacity battery. 3/0. 6 = 40. 5 ( Ah) < / p > < p > result: 38 ah battery (optional 12 v / 38 ah battery 8) < / p > < p > in the UPS battery discharge should be constant power discharge, should load power at the mains is normal or not is not change. < / p > < p > the battery discharge current = ( The power factor of load of apparent power load x) /( X efficiency of inverter battery voltage) 。 The characteristics of the load of any changes will cause the change of discharge current. < / p > < p > UPS there is constant current discharge. Only when determining configuration batteries, battery parameters of some battery manufacturers only gives a constant current discharge parameters ( Because the battery of the same amount of definition is defined according to the constant current discharge) May use constant current discharge, when the parameters of < / p > < p > total power load * support the power factor of load time = nominal capacity battery * * UPS battery voltage discharge efficiency inverter efficiency < / p > < p > support time = ( Nominal capacity battery * * UPS battery voltage discharge efficiency inverter efficiency) /( The power factor of load by total power load) < / p > < p > nominal capacity battery = ( The power factor of load by total power load x support time) /( Discharge * UPS battery voltage inverter efficiency) < / p > < p > support time = ( AH * battery voltage discharge efficiency by 0. 9) /( KVA×0。 7) < / p > < p > nominal capacity battery = ( KVA×0。 7 x support time) /( * 0 battery voltage discharge efficiency. 9) < / p > < p > < / p >
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