NEC ALM 12V7 s-Series User Manual

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NEC ALM 12V7 s-Series User Manual Manual pdf 33 page image

ALM ® 12V7 s-Series User’s Guide Chapter 5: Operation and System Design Considerations406014-02EN, Rev. 05 © 2016 NEC Energy Solutions, Inc. All rights reserved. Page 33 of 49This document contains the proprietary information of NEC Energy Solutions, Inc. (“NECES”) and may not be modified,reproduced, retransmitted or redistributed, either in whole or in part, for any reason without NECES’ prior written consent.Low Temperature OperationAt low temperatures, the maximum available discharge current decreases due to increasedinternal impedance at lower temperatures. Refer to Figure 9 on page 40 and Charge Limitsand Temperatures, on page 34 for more details.NOTEDo not operate the battery outside of the operational temperature range specified in Table 4 onpage 23.REMARQUENe pas faire fonctionner la batterie en dehors de la plage de température d'exploitation préciséedans Tableau 6 à la page 25.Charging Single BatteriesThe ALM 12V7 s-Series batteries are compatible with most common 12V lead‐acid batterychargers. A single ALM 12V7s HP battery can accept up to 45 A (23A with the ALM 12V7s)charge current maximum. Higher current for short durations is allowed. However, in somesituations, internal component temperatures may be exceeded causing performance to becurtailed by the battery’s protection circuitry. For more information on hardware protectionlimits, refer to Appendix A, Operational Protection Hardware Circuitry on page 46. Additionalcharge limit information is also described in Charge Limits and Temperatures, on page 34.NOTEUse of chargers with a temperature compensation feature, typically required for lead-acid batteries,may result in an incomplete or possibly no charge at elevated temperatures, but will not damage thebattery. It is recommended that such temperature compensation features be disabled.Constant Current (CC), Float Voltage ChargersFor ALM 12V7 s-Series batteries operating under normal conditions during a charge, acharger applies a constant current (CC) until the terminal voltage reaches its end of chargevoltage (maximum), as shown in Figure 6 on page 34. This process is followed by a floatvoltage, where the charge current decays to near zero. As the battery approaches 100%State of Charge (SOC), the balancing circuitry performs cell balancing. This process chargesthe ALM 12V7 s-Series battery to 100% State of Charge (SOC).