ALM
®
12V7 s-Series User’s Guide
Chapter 5: Operation and System Design Considerations
406014-02EN, Rev. 05
© 2016 NEC Energy Solutions, Inc. All rights reserved.
Page 33 of 49
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reproduced, retransmitted or redistributed, either in whole or in part, for any reason without NECES’ prior written consent.
Low Temperature Operation
At low temperatures, the maximum available discharge current decreases due to increased
internal impedance at lower temperatures. Refer to
and
on page 34 for more details.
NOTE
Do not operate the battery outside of the operational temperature range specified in
REMARQUE
Ne pas faire fonctionner la batterie en dehors de la plage de température d'exploitation précisée
dans
Charging Single Batteries
The ALM 12V7 s-Series batteries are compatible with most common 12V lead‐acid battery
chargers. 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 some
situations, internal component temperatures may be exceeded causing performance to be
curtailed by the battery’s protection circuitry. For more information on hardware protection
limits, refer to
Appendix A, Operational Protection Hardware Circuitry
. Additional
charge limit information is also described in
Charge Limits and Temperatures,
NOTE
Use 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 the
battery. It is recommended that such temperature compensation features be disabled.
Constant Current (CC), Float Voltage Chargers
For ALM 12V7 s-Series batteries operating under normal conditions during a charge, a
charger applies a constant current (CC) until the terminal voltage reaches its end of charge
voltage (maximum), as shown in
on page 34. This process is followed by a float
voltage, 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 charges
the ALM 12V7 s-Series battery to 100% State of Charge (SOC).
