1.5v Alkaline battery

　　Advantages and Disadvantages of 1.5v Alkaline batteryBank Parallel Circuit

　　Benefits of Shared Battery Packs

　　So, what are the benefits of using a shared battery pack in a parallel system? The following uses parallel redundant backup as an example. In a shared battery pack parallel system, if it is a 100kVA+100kVA parallel system, the battery pack must ensure Power outage supply is 1h (the battery is planned to be equipped with 4 sets of 100Ah/12V). When the mains power is abnormal, the battery pack supplies power to the inverters of UPS1 and UPS2 respectively. When the mains power is abnormal, and assuming that inverter 1 in UPS1 fails, the entire battery pack can ensure the inverter operation of the remaining UPS2. Inverter 2 works for 1 hour. When working with separate battery packs, if the above problems occur. At this time, only battery pack 2 can provide power to inverter 2, and the time is only 0.5h. It can be seen that the power supply time is 0.5h less than that of the battery-sharing system. This is the biggest and only benefit of the shared battery pack.

　　Problems with shared battery packs

　　① In a parallel system, there are generally communication lines between inverters for current sharing control, but there are no communication lines between rectifiers for current sharing control. In a shared battery system, the rectifiers of two UPSs are actually directly connected in parallel. Together, in a capacity expansion application, because the two rectifiers do not have current sharing control, it is easy to cause one rectifier to be overloaded, and the other one cannot be driven, causing the rectification failure of the entire system to shift to battery pack discharge.

　　② Even if the shared battery pack is used in a redundant backup system, when the rectifier of one UPS fails, especially if the voltage is out of control, the entire battery pack will face catastrophic consequences, and all battery packs may be scrapped due to overcharging. Then, in the event of a power outage, the entire system will be powered off, with disastrous consequences. Although UPS generally has a protection circuit, rectifier failure is inevitable. If the rectifier 1 of UPS1 loses control and causes bus voltage overvoltage, all battery packs will be overcharged and damaged.

　　③From the perspective of maintenance, when maintaining the battery, if a shared system is used, both the positive and negative poles must be disconnected, and the battery pack is generally only equipped with an air switch on the positive pole. If both the positive and negative poles are connected to the air switch, the reliability of the battery circuit will decrease. If separate battery packs are used, there will be no such problem in maintenance.

　　④ For systems that require a short battery power supply and share a battery pack, the problem is even greater. Generally, problems with the UPS system are mostly caused by the battery pack. Therefore, sharing a set of battery packs will greatly reduce the reliability of the entire parallel system. Once the mains power is abnormal, as long as one battery in the battery pack has a problem, the UPS will have no output, and the consequences will be catastrophic.

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