AlphaCellTM SMU-HR Series Batteries Technical Manual Effective: July 2010
AlphaCellTM SMU-HR Series Batteries Technical Manual 745-680-B2-002, Rev. B Effective Date: July, 2010 Copyright © 2010 Alpha Technologies, Inc. member of The GroupTM NOTE: Photographs contained in this manual are for illustrative purposes only. These photographs may not match your installation. NOTE: Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding.
Table of Contents Safety Notes........................................................................................................................... 6 1.0 2.0 Introduction.................................................................................................................. 8 1.1 Features............................................................................................................ 8 1.2 Typical Electrical and Mechanical Specifications.......................................
Figures Fig. 1-1, Available Capacity vs. Ambient Temperature........................................................... 9 Fig. 2-1, Recharge Time and Capacity Restored as Function of Current Limit.................... 13 Fig. 3-1, Capacity vs. Storage Time..................................................................................... 14 Fig. 4-1, VRLA Battery Regular Maintenance Record..........................................................
Safety Notes Review the drawings and illustrations contained in this manual before proceeding. If there are any questions regarding the safe installation or operation of the system, contact Alpha Technologies or the nearest Alpha representative. Save this document for future reference. To reduce the risk of injury or death, and to ensure the continued safe operation of this product, the following symbols have been placed throughout this manual. Where these symbols appear, use extra care and attention.
Battery Safety Notes WARNING! Lead-acid batteries contain dangerous voltages, currents and corrosive material. Battery installation, maintenance, service and replacement must be performed only by authorized personnel. Chemical Hazards Any gelled or liquid leakage from a valve-regulated lead-acid (VRLA) battery contains dilute sulfuric acid, which is harmful to the skin and eyes. Emissions are electrolytic, and are electrically conductive and corrosive.
1.0 Introduction The SMU-HR series of Valve Regulated Lead Acid (VRLA) batteries is designed to meet the needs of many industrial and utility applications. The success of the AlphaCell SMU-HR series is due to a product design purpose-built for the needs of critical backup requirements, and an industry-leading manufacturing technology which delivers product consistency. Safety, reliability, and long service life in standby applications are the result.
1.0 Introduction, continued 1.3 Operating Conditions Because SMU-HR batteries, which are valve regulated and virtually sealed, do not give off perceptible amounts of gas under normal operating conditions, they can be installed in the same environment where people live and work. • • • • 1.
1.0 Introduction, continued 1.5 Temperature and Battery Life High temperatures can harm the battery and reduce its lifespan. Battery life decreases by 50% every per 15ºF (~ 9ºC) above the standard operating temperature of 77ºF (25ºC). To minimize battery damage: • • • • • 1.6 Use temperature compensated chargers. Never allow the battery's temperature to exceed +131ºF (+55°C). Make sure operating area is properly ventilated, so heat cannot accumulate. Provide at least 0.
2.0 Charging Procedures NOTE: Refer to your particular charger’s manual for specific instructions regarding charger setup and operation. During operation, verify batteries are: • • Float-charged in order to maintain a fully charged condition during the standby period. Completely recharged after a discharge. Recharge as soon as possible to ensure maximum protection against subsequent power outages. Early recharge also ensures maximum battery life.
2.1 Float Charge, continued Float Current The normal float current observed in fully charged SMU-HR batteries at 2.27Vpc at a temperature of 68F (20C) is approximately 30mA per 100Ah. Because of the nature of recombination phenomena, the float current observed in SMU-HR batteries is normally higher than that of vented batteries and is not an indication of the state of charge of the batteries. Thermal Runaway Float current is primarily a function of voltage and temperature.
2.2 Recharge Following Discharge, continued Using a current limit of 0.1 C10, it takes approximately 9 hours to restore 80% of the discharge, and 11 hours to restore 90%. This can be compared to a current limit of 0.25 C10, whereby 80% is returned in approximately 4 hours, and 90% within 5 hours. NOTE: While less charger (rectifier) amps means a longer recharge time, too many charger (rectifier) amps can damage the battery. 110% 100% 90% 80% Capacity 70% 60% 50% 40% 30% 0.1C10 0.1C5 0.
3.0 Storage, continued All lead acid batteries experience self-discharge while in open circuit storage. This causes circuit voltage and capacity to decrease (see Fig. 3-1). During storage please note: • The self-discharge rate is related to ambient temperature. The lower the temperature, the less the discharge. Batteries should be stored in a clean, ventilated, and dry location with an ambient temperature of 32ºF to 95ºF (0ºC to 35ºC).
4.0 Maintenance 4.1 Recommended Maintenance Tasks In order to prolong battery life, perform regular maintenance and inspections. Monthly Maintenance • Keep the batteries and battery room clean. • Measure and record the ambient temperature of the battery-room. • Check for damage and overheating evidence on the terminal, container, and lid. • Measure and record the total voltage and floating current of the battery system.
4.0 Maintenance, continued Type: Place: Test Status: Qty: Total Voltage (V): Room Temperature: Current (A): No. Voltage (V) No. 1 13 2 14 3 15 4 16 5 17 6 18 7 19 8 20 9 21 10 22 11 23 12 24 Voltage (V) Visual check: Fig. 4-1, VRLA Battery Regular Maintenance Record 16 745-680-B2-002, Rev.
5.0 Discharge Specifications 5.1 Discharge Data with Constant Current Amperage values for each battery model as a function of time and voltage @ 77°F/25°C. SMU-HR 12-9 End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h 1.60V 41.4 25.7 19.4 11.8 5.69 2.50 1.53 0.83 0.48 1.67V 38.8 24.4 18.7 11.3 5.61 2.40 1.49 0.82 0.46 1.70V 35.6 23.5 18.2 10.3 5.44 2.24 1.46 0.82 0.45 1.75V 34.9 22.8 17.6 9.78 5.18 2.17 1.43 0.81 0.44 1.80V 31.2 21.8 16.0 9.06 4.
5.1 Discharge Data with Constant Current, continued SMU-HR 12-75 End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h 1.60V 196 136 105 77.0 49.5 23.3 14.8 7.50 3.83 1.67V 192 135 103 76.0 49.2 23.1 14.7 7.40 3.80 1.70V 192 135 103 76.0 49.2 23.0 14.6 7.40 3.78 1.75V 190 135 103 76.0 49.0 23.0 14.4 7.30 3.75 1.80V 188 135 103 75.0 47.0 22.5 14.0 7.20 3.70 1.85V 175 123 99.0 67.5 45.8 20.7 14.0 7.10 3.
5.2 Discharge Data with Constant Power Wattage values for each battery model as a function of time and voltage with constant Watts per cell @ 77°F/25°C. SMU-HR 12-9 End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h 1.60V 72.6 46.5 35.4 21.3 10.3 4.43 2.58 1.71 0.95 1.67V 70.0 45.3 35.0 20.9 10.2 4.29 2.57 1.70 0.92 1.70V 66.4 44.9 34.7 19.6 10.0 4.10 2.53 1.69 0.91 1.75V 65.9 44.7 34.4 19.0 9.83 4.00 2.51 1.65 0.88 1.80V 60.7 44.0 31.9 18.1 9.27 3.
5.2 Discharge Data with Constant Power, continued SMU-HR 12-75 End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h 1.60V 537 368 284 181 108 49.7 33.3 16.2 7.91 1.67V 512 359 270 178 106 46.3 32.0 16.0 7.88 1.70V 500 350 268 177 105 45.7 31.3 15.8 7.88 1.75V 484 342 265 172 103 45.0 30.8 15.8 7.84 1.80V 470 330 263 162 103 43.3 30.0 15.7 7.56 1.85V 420 300 258 158 102 42.5 28.7 15.0 7.37 SMU-HR 12-90 End voltage 10Min 15Min 30Min 1.
6.0 Forms 6.1 Discharge Recording Form Model of Battery Date Battery Bank No. Room Temperature Charging Current Total battery Voltage Remarks Cell # Inital Voltage 745-680-B2-002, Rev.
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