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Summary of Contents for Yuasa NP Series
- Page 1 YUASA YUASA VALVE REGULATED LEAD ACID BATTERY M A N U A L...
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Page 2: Technical Features
This low pressure venting system, coupled with the significantly high recombination efficiency, make Yuasa NP batteries one of the safest valve regulated lead acid batteries available. •... - Page 3 • Operating Temperature Range ... Yuasa NP batteries can be used over a broad range of ambient temperatures, allowing considerable flexibility in system design and location. • High Recovery Capability ....
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Page 4: General Specifications
GENERAL SPECIFICATIONS Nominal Nominal Dimensions Voltage Capacity (Ah) Weight Approx Height over (Kg) Model (20Hr.) (10Hr.) L(mm) W(mm) Terminals (mm) Layout Terminals NP4.2-4H 4.20 35.5 0.56 Flat NP10-4 10.0 9.25 1.35 NP1-6 0.93 42.5 54.5 0.25 NP1.2-6 54.5 1.11 0.31 NP2.8-6 2.60 0.57... - Page 5 Table 2. LAYOUT Table3. TERMINALS – 4 –...
- Page 6 Table illustrate at various discharge capacity rates. typical discharge characteristics of Yuasa NP batteries at an ambient temperature of 25°. The symbol “C” Table 6 shows that the rated nominal capacity of a expresses the nominal capacity of the battery measured battery is reduced when it is discharged at a value of at a 20-Hour discharge rate.
- Page 7 Table 4. DISCHARGE CURRENT AT STIPULATED DISCHARGE RATES Discharge Current 20 Hr. Capacity 0.05C 0.1C 0.2C 0.4C 0.6C 0.8 Ah 0.04 A 0.08 A 0.16A 0.32A 0.48 A 0.8A 1.6A 2.4 A 0.05 0.10 0.20 0.40 0.60 0.06 0.12 0.24 0.48 0.72 0.105...
- Page 8 Calculation of battery size required for Constant Power load conditions. Using Table 5 “Watts/Cell/Ah”, map the required load time to the specified end of discharge voltage. The figure obtained is the Constant Power available from each 1Ah of NP type cell. Divide this number into the required wattage load per cell to give the minimum value of capacity required to supply the required load.
- Page 9 Yuasa NP batteries can recover their capacity when For example, if a lead acid battery were discharged to recharged correctly. Final discharge voltage is shown in zero volts, and left standing in either “on”...
- Page 10 Temperature Characteristics At higher temperatures, the electrical (Ah) capacity of a Figure 4 shows the effects of different temperatures in battery increases and conversely at lower temperatures, relation to battery capacity. the electrical (Ah) capacity of a battery decreases. STORAGE, SELF DISCHARGE and SHELF LIFE Self Discharge The self discharge rate of NP batteries is approximately ambient storage temperature.
- Page 11 Shelf Life In general, when lead acid batteries of any type are stored Brief excursions i.e., a few days, at temperatures higher for extended periods of time, lead sulphate is formed on than the ranges recommended will have no adverse the negative plates of the batteries.
- Page 12 Figure 6 shows extrapolated Service Life condition for be seen from figure 6 higher ambient temperatures will NP batteries at different ambient temperatures. As can reduce service life. – 11 –...
- Page 13 AVAILABLE CAPACITY, MEASURED BY OPEN CIRCUIT VOLTAGE The approximate depth of discharge, or remaining capacity, in a Yuasa NP battery can be empirically determined by referring to Figure 7. IMPEDANCE The internal resistance (impedance) of a battery is lowest shows the internal resistance of an NP6-12 battery when the battery is in a fully charged state.
- Page 14 Impedance testing can be performed using the Yuasa YPI-2 not be used where a high AC ripple content exists.) By Impedance/comparator test meter, this form of testing is using this test method deterioration can be detected with- non-intrusive and can be performed online with the battery out removing the battery from its standby mode.
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- Page 18 Constant Current Charging This charging method is not often utilised for valve with a constant current. If, after the battery has reached a regulated lead acid batteries, but is an effective method fully charged state, the charge is continued at the same for charging a number of series connected batteries at rate, for an extended period of time, severe overcharge the same time, and/or as an equalising charge to correct...
- Page 19 Taper Current Charging This method of charging is not recommended due to the incorporated to prevent overcharge. Please consult us constant current characteristics of taper charging being for specific recommendations. somewhat harsh on valve regulated lead acid batteries. This particular charging regime can often shorten battery In a taper current charging circuit, the charging current service life.
- Page 20 Two Stage Constant Voltage Charging Two stage constant voltage charging is a recommended fully charged float or standby condition. Figure 20 method for charging valve regulated lead acid batteries illustrates the characteristics of a two stage constant in a short period of time and then maintaining them in a voltage charger.
- Page 21 When interfaced with the appropriate AC or DC power supply, the Yuasa C.V.C.C. guarantees safe charging and maximum battery life. Figure 23 is a block diagram of the C.V.C.C.
- Page 22 Solar Powered Chargers A battery is an indispensable component of any solar powered system designed for demand energy use. Since solar cells have inherent constant voltage characteristics, NP batteries can be charged directly from the solar array using a simple diode regulated circuit as shown in Figure In designing a solar powered system, consideration conditions are such that the potential for overcharging should be given to the fact that in addition to normal...
- Page 23 Charging Voltage The charging voltage should be chosen according to the For float (standby) use..2.275vpc ± 0.005 volts per cell type of service in which the battery will be used. For cyclic use ....2.40 to 2.50 volts per cell Generally, the following voltages are used: In a constant voltage charging system, a large amount of the temperature is higher, the charging voltage should...
- Page 24 0.25C Amps. However, in float/standby use, Yuasa NP batteries are designed so that even if the available charging...
- Page 25 Top Charging Since any battery loses capacity through self discharge, Excluding conditions in which storage temperatures have it is recommended that, prior to putting the battery into been abnormally high, top charging is recommended service, a process called “top charging” be applied to any within the following parameters: battery which has been stored for a long period of time.
- Page 26 Temperature Compensation As the temperature rises, electrochemical activity in a battery recommended compensation factor for NP batteries is increases and conversely decreases as temperature falls. -3mV/°C/Cell (for float/standby) and -4mV/°C/Cell. (cyclic Therefore, as the temperature rises, the charging voltage use). The standard centre point for temperature should be reduced to prevent overcharge and increased, compensation is 20°C.
- Page 27 Figure 30 illustrates the concept of the state of charge and charging efficiency. As shown in Figure 31, Yuasa NP batteries exhibit very high charging efficiency, even at low charging rates, unlike some nickel cadmium batteries.
- Page 28 The relationship between the number of cycles which than the one that is required to carry the load. Thus, at can be expected and the depth of discharge is readily the specified discharge rate over the specified time, the apparent. If an extended cycle life is required then it is depth of discharge will be shallower and cyclic service common practice to select a battery with a larger capacity life will be longer.
- Page 29 DESIGN/APPLICATION TIPS TO ENSURE MAXIMUM SERVICE Yuasa NP batteries are highly efficient maintenance free lengths of wires, cables or busbars that have the same electrochemical systems designed to provide years of loop line resistance as each other. This makes sure that trouble free electrical energy.
- Page 30 GLOSSARY 1. Ampere (A) ....The unit for measuring the flow of electric current. 2. Ampere hour (Ah) ..The current in (A amperes) multiplied by time in (h hours). Used to indicate the capacity of a battery. 3. Capacity (C)....Ampere hours that can be discharged from a battery. 4.
- Page 31 INDEX Abnormal, 23 Cells, 7, 21 Abnormally, 8,24 Charge, 2, 8, 10, 17, 18, 19, 23, 24, 26, 27, 29 ABS, 28 Charged, 12, 13, 17, 19, 21, 22, 23, 26, 29 Absorbed, 29 Charger, 13, 18, 19, 20, 23, 24, 25, 29 Absorbent, 28 Chargers, 13, 21 Accelerated, 27...
- Page 32 Enclosures, 21 Lead, 1, 4, 5, 8, 10, 13, 17, 18, 19, 29 End, 5, 7, 27, 28 Leakage, 1 Energy, 1, 21, 22, 24, 28, 29 Life, 1, 2, 5, 8, 9, 10, 11, 13, 18, 20, 25, 27, 28, 29 Environmental, 21 Load, 7, 8, 19, 21, 23, 27, 28, 29 Equalisation, 28...
- Page 33 Regulated, 1, 4, 5, 13, 17, 18, 19, 20, 21, 22, 29 VA, 7 Regulation, 23 Valve, 1, 4, 5, 13, 17, 18, 19, 29 Regulations, 1 Vibration, 28 Reseal, 1 Volt, 7, 20, 24 Resin, 28 Vpc, 7, 23, 24 Resistance, 8, 12, 13, 24, 28, 29 Resistive, 21 WAC, 7...
- Page 34 NOTES Further technical information available on request: • Transportation of Yuasa Batteries by Air, Sea or Road • Effect of High Temperature on Battery Float Life • Gas Production in Valve Regulated Lead Acid (V.R.L.A.) Batteries • Safe Handling of product (C.O.S.H.H.) •...
- Page 35 Yuasa Battery Sales (U.K) Limited, Unit 22, Rassau Industrial Estate, Ebbw Vale, Gwent, NP23 5SD T: (Sales) 08708 500 312 (Tech) 08708 500 314 F: 08708 500 317 E: enquiries@yuasa-sales.co.uk W: www.yuasa-battery.co.uk Yuasa Battery (Europe) GMBH, Wanheimer Str. 47, D-40472 Düsseldorf, Germany Telefon: 0049 211 417900 Fax: 0049 211 4179011 Issue Date 01.12.99...
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