The purpose of adding a battery is usually to increase the battery capacity of the UPS, thereby extending the duration of power supply during a power outage. This can be adjusted according to the specific UPS model and battery compatibility:
1. Find the UPS model and specifications: Check the model and specifications of the UPS you purchased. In the UPS user manual, specification sheet or manufacturer’s official website, you can find information about the maximum battery capacity of the UPS and whether it supports connecting additional batteries.
2. Confirm battery compatibility: Make sure the battery you purchase is compatible with the UPS. Usually, the UPS manufacturer provides recommended or certified battery models. Using incompatible batteries may cause performance problems or damage the UPS.
3. Purchase suitable batteries: Purchase batteries of appropriate specifications and capacity according to the requirements of the UPS. Ensure that the batteries can be properly connected to the UPS and provide the required additional battery capacity.
4. UPS battery slot: Most UPS have a dedicated slot for connecting additional batteries. Open the battery compartment door of the UPS and find the location of the slot. Usually, the location of the slot is for the convenience of users to connect batteries.
5. Connect the battery: Connect the battery cable to the corresponding slot on the UPS. Make sure to insert the connector correctly to prevent reverse connection. Usually, the way to connect the cable is through a connector or clamp.
6. Test and monitor: After connecting the battery, start the UPS and check whether the connected battery is correctly identified through the monitoring interface or display. Perform some basic tests to ensure that the UPS can properly utilize the newly added battery capacity.
7. Regular maintenance: Check the status of the batteries regularly to ensure they are in good working condition. Replace the batteries regularly according to the manufacturer’s recommendations to ensure the performance of the UPS.
Battery calculation
1. Basic technical indicators of UPS batteries:
lValve-regulated sealed lead-acid batteries: one set is connected to each UPS.
lFloat charge voltage tolerance: 1%.
lFloat charge voltage: 2.23~2.27V/cell.
lBalanced charging voltage: 2.3~2.4V/cell
lDischarge end voltage: 1.67~1.70V/cell
The impact of temperature on battery life: Under floating charge operation at 25℃, the theoretical life is not less than 10 years.
2. Calculation of UPS battery capacity
2.1 UPS battery maximum discharge current I
I=SxCOSφ/ŋxEi
Where: S is the nominal output power of the UPS power supply
COSφ is the load power factor, generally taken as 0.8;
ŋ is the efficiency of the inverter, which is generally 0.8;
Ei is the UPS battery discharge end voltage
2.2. Battery backup time t depends on the needs of users. Small and medium-sized UPS mostly use valve-controlled lead-acid batteries. The price is relatively expensive, and the full-load working time is generally selected as 10min, 15min or 30min.
2.3. UPS battery capacity C After calculating the maximum discharge current, the standard battery capacity is calculated based on the load properties and the UPS backup time required by the user: (C=lt).