Definitions
The following definitions are used in this manual and will be helpful in understanding SymmetraTM.
Redundancy - Indicates the presence of one or more extra modules, allowing the system to sustain a fault and continue to provide full protection to the load. To be fully redundant, the system should be configured with a redundant intelligence module, and at least one redundant power module.
Note: The number of battery modules determines the length of the run time. While it is prudent to use the maximum number of battery modules possible, they are not considered redundant.
N+1 Redundancy - Refers to the level of redundancy, specifi- cally related to power modules. “N” represents the number of modules required to power the load, and “+1, +2, etc.” repre- sents the number of extra power modules that are present.
For example, a 7.3 kVA load requires two power modules for adequate protection. If the SymmetraTM is configured with only two modules, it has an “N+0,” level of redundancy. (No redundancy). If the system is configured with three power modules, it has an “N+1” redundancy. Depending on the size of the load, SymmetraTM can be configured with 2, 3 or even 4 extra power modules. Respectively, it would have an N+2, N+3, or N+4 level of redundancy.
Capacity - The maximum amount of output power that a SymmetraTM system can deliver. The capacity is limited by the lesser of the frame size, or the capacity of the installed power modules.
For example, a MiniFrame (8kVA) with one power module installed (4kVA) has a system capacity of 4kVA. A MasterFrame (16kVA) with five power modules (20kVA) has a system ca- pacity of 16kVA.
Important Information
Please read this User's Manual thoroughly, before proceeding with the installation of the SymmetraTM Power Array system. It provides important information about installing and using the SymmetraTM safely and effectively. Pay close attention to text that is accompanied by a danger, or caution symbol. For technical support, contact APC at:
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