UPS (uninterruptible power supply) how to calculate the power supply, such as 100W electrical power can be how long?
According to W = Pt
Then t = W / P
T: time (seconds)
W: electric power (joules) (1 kWh = 3.6 * 10 ^ 6 joules)
P: Electric power (watts)
UPS power supply capacity is mainly from its own capacity and the size of the load to consider.
UPS is actually a power supply, put its power (of course, in the case of full) / load power = use time
Power supply time and your battery capacity is proportional relationship, and battery life is inversely related. But also depends on the load you bring, with a lot of time shorter, with the opposite of the contrary.
UPS power supply power supply time has been a computer for example, no more than 10 minutes.
It is the main role so that you can save the data in time, the normal closure of the computer.
100W means that its maximum load can be used with power 100W appliances, not the use of time.
But in general the smaller the power, the longer the time is.
This calculation:
1, calculate the input power required. Small UPS efficiency of 60%, so the input power: 100 ÷ 60% ≈ 166.7VA.
2, calculate the input DC current. Access to two 12-volt 24ah battery, in series for the 24-volt, the input DC current: 166.7 (VA) ÷ 24 (V) ≈ 6.99
3, calculate the power supply time. 24 (ah) ÷ 6.9 (A) ≈ 3.5 (hours).
Results: 200VA UPS, connecting two 12-volt 24ah battery, for 100W electrical work for about 3.5 hours.
