Step-Down Transformer (480 Vac to 240 V)
The AES Cabinet may require a 208-240 Vac single-phase supply for its auxiliary AC input, which powers the control system (maintaining UPS functionality) and the Thermal Management System (TMS). If a 208–240 V single-phase supply is unavailable, a 5 kVA (or larger) single-phase step-down transformer with a 480 V primary and 240 V secondary can be used. This transformer converts 480 Vac from the inverter to 240 Vac, ensuring proper operation of the battery auxiliary input and TMS.
Example Step-Down Transformer (480 Vac to 240 Vac)
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Installation Instructions (for reference): The transformer’s installation manual is the primary resource for installation guidance. |
Example Transformer Wiring
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Operational Considerations For continuous off-gird operation wire the AC input to provide continuous power to auxiliary components, such as the TMS, even when grid or generator power is unavailable. |
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AC System Compatibility For installations using a 120/208 three-phase or a single-phase 120/240 setup, a transformer may not be required. The TMS and UPS can operate within an AC input range of 200 to 276 Vac. Therefore a single-phase input of either 208 or 240 V can be utilized. |
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Operational Considerations A single larger transformer can support multiple battery cabinets at the same site. To meet the system's power requirements, ensure the transformer has a load capacity of at least 5 kVA per cabinet. |