Requirements for a Third Party Battery Solution
Battery breaker boxes from Schneider Electric are recommended for the battery interface. Please contact Schneider Electric for more information.
Third Party Battery Circuit Breaker Requirements
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Hazard of electric shock, explosion, or arc flash
All selected battery circuit breakers must be equipped
with instantaneous trip functionality with an undervoltage release
coil or a shunt trip release coil.
Failure to follow these instructions will result in death or serious injury.
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Design Requirements for a Battery Circuit Breaker
Battery circuit breaker rated DC voltage > Normal battery voltage | The normal voltage of the battery configuration is defined as the highest nominal occurring battery voltage. This can be equivalent to the float voltage which may be defined as number of battery blocks x number of cells x cell float voltage. |
Battery circuit breaker rated DC current > Rated discharge battery current | This current is controlled by the UPS and must include maximum discharge current. This will typically be the current at the end of discharge (minimum operation DC voltage or in overload condition or a combination). |
DC landings | Two DC landings for DC cables (DC+ and DC-) are required. |
AUX switches for monitoring | One AUX switch must be installed in each battery circuit breaker and connected to the UPS. The UPS can monitor up to two battery circuit breakers. |
Short-circuit breaking capability | The short-circuit breaking capability must be higher than the short-circuit DC current of the (largest) battery configuration. |
Minimum trip current | The minimum short-circuit current to trip the battery circuit breaker must match the (smallest) battery configuration, to make the breaker trip in case of a short circuit, up to the end of its life time. |