UPS power capacity unit, UPS power capacity calculation method. The determination of UPS power supply capacity is based on the load capacity and nature, and selecting an appropriate UPS can not only ensure the power supply quality of the UPS, reduce the failure rate, but also save investment and improve economic benefits. Generally speaking, the determination of UPS capacity is mainly to meet the needs of the current load. At present, the output power given by most UPS manufacturers in the product manual refers to the load power factor of 0.8.
UPS power capacity unit
When we discuss the power of a UPS power supply, two parameters will be mentioned. For example, 3KVA/2400W, or 10KVA/9000W. Both W and VA are the capacity units of UPS power supply, W is the effective power, and VA is the apparent power. The nominal value of UPS power supply equipment is VA, and the corresponding W value will be given in the general technical parameters. There is a converted power factor between W and VA. For example, 400W/500VA can get a power factor of 0.8. The reason for this power factor is that in an AC system, a part of the current (harmonic current) is not supplied to the load, resulting in apparent power VA, which is greater than effective power W.
When we select the UPS power supply equipment, the calculated load power should not be greater than the effective power. If the effective power exceeds the effective power, the UPS power supply will be overloaded. In this case, the UPS host will continue to give an alarm and switch to bypass power supply, so that the UPS power supply It won't work uninterrupted.
At present, most of the UPS power systems sold on the market are based on VA (apparent power), V represents voltage, A represents current, and voltage multiplied by current represents power, which is the capacity of the UPS uninterruptible power system; a 500VA continuous Electric system to illustrate, when its output voltage is 110V, it can supply a current of 4.55A, when the current value required by your load exceeds 4.55A, it means overload.
Under normal circumstances, the UPS power supply sold on the market, the smaller capacity is marked with "W" (watt); if it exceeds 1 kWh, it is marked with "VA" (volt-ampere), and the "W" and "VA" values There is a difference. This requires that we must distinguish between specific situations to choose. Generally speaking, the small-capacity UPS within 1 kW generally uses "W" to indicate the capacity, and the UPS with a capacity of 1KVA to 500KVA uses VA instead of W to indicate the capacity.
UPS power supply capacity calculation method
1. Understand the output power of UPS power supply and battery inverter voltage
Take C3K as an example here, which is a UPS power supply with a power of 3KVA battery and an inverter voltage of 96V. These information are generally obtained from the company's website or product information, and the battery pack voltage of different models of machines is different.
2. Calculate the actual output power of the UPS power supply
UPS power X0.7=actual output power, 3KVAX0.7=2.1KW (actual output power), 2.1KW=2100W.
3. Calculate the total capacity of the battery pack
(Actual output power/battery voltage) X delay time = total capacity of battery pack (AH) The delay time is of course the best for the customer, for example, a delay of 8 hours is required; (2100W/96V) X8H=175AH (total capacity of the battery pack) )
4. Battery selection
Only conventional batteries are used here as a reference. Conventional 12V batteries have specifications: 12V4AH, 12V7AH, 12V17AH, 12A24AH, 12V38AH, 12V65AH, 12V100AH. There is a problem here that needs to be explained. The capacity of batteries connected in series is equal to the capacity of one battery, but the voltage raised. For example: 12V24AHX8 = 96V24AH (series battery pack capacity).
When purchasing a UPS battery, you need to know the actual capacity of the battery, and the capacity of batteries of various brands varies. It is also necessary to know the real power of the actual load, so as to decide whether the capacity of the battery should be large or small, and it should be applied flexibly.
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