EN-SBS-EON-AG-004 - Enersys - EMEA

enersysemea

EN-SBS-EON-AG-004 - Enersys - EMEA

RESERVE

POWER

APPLICATION GUIDE


2

EnerSys ® has optimised the very successful Thin Plate Pure Lead

(TPPL) PowerSafe ® SBS battery range to create the revolutionary EON

Technology ® , a new concept that utilises highest purity materials and

state of the art manufacturing processes to deliver energy storage

solutions that can meet the requirements of emerging applications

whilst offering the end user enhanced performance in existing

applications. Historically, the useful service life of reserve power

Valve Regulated Lead Acid (VRLA) battery systems was measured by

their float life but as applications evolve from pure standby to cyclic

applications, some traditional VRLA technologies find that these new

requirements push them beyond their scope of operation.

PowerSafe SBS Eon Technology batteries retain the long float

characteristics of standard PowerSafe SBS cells and monoblocs, with

the added benefit of improved cyclic ability in both float voltage and

fast charge applications.

Interchangeability

PowerSafe SBS EON Technology monoblocs are fully interchangeable

with standard PowerSafe SBS battery equivalents (where applicable).

When used in conventional float applications the fit, form and

function remain unchanged and their mixing will have no detrimental

effect to either the performance or expected service life. However,

where a PowerSafe SBS EON Technology monobloc is introduced as

a replacement into an equivalent standard PowerSafe SBS battery it

must be understood that the improved cyclic capability afforded by

EON Technology will not be achieved.

Operating Temperature Range

The recommended operating temperature range for optimum life and

performance is 20°C. However, PowerSafe SBS EON Technology

batteries can be operated in the temperature range -40°C to +50°C.

In order to maintain mechanical integrity of the plastic components,

the battery temperature in operation should not exceed +50°C.

Storage

Batteries lose capacity when standing on open-circuit because of

parasitic chemical reactions. The self-discharge rate of PowerSafe

SBS EON Technology monoblocs is very low because of the high

purity of the grid lead and electrolyte. Batteries should be stored in a

cool, dry area. High temperature increases the rate of self-discharge

and reduces storage life.

Figure 1 shows the relationship between open-circuit voltage (OCV)

and storage time at various temperatures.

2.17

100

2.16

96

2.15

91

2.14

87

2.13

83

2.12

79

2.11

2.10

+40°C +30°C +25°C +20°C +10°C

74

70

0 6 12 18 24 30 36 42 48

Figure 1

Months

Open Circuit Voltage per Cell

The maximum storage times before a freshening charge is required

and recommended open circuit voltage audit intervals are:

Temperature Storage Time OCV Audit Interval

(°C / °F) (Months) (Months)

+10 / +50 48 6

+15 / +59 34 6

+20 / +68 24 4

+25 / +77 17 4

+30 / +86 12 3

+35 / +95 8.5 2

+40 / +104 6 2

Monoblocs must be given a freshening charge when bloc voltages

approach the equivalent of 2.10 Volts per cell or when the maximum

storage time is reached, whichever occurs first.

Approx. State of Charge (%)

Commissioning Charge

Before conducting a capacity discharge or fully loaded duty cycle test,

the battery must be given a commissioning charge. In float

applications the commissioning charge shall consist of 7 continuous

days of float charge at the recommended float voltage (2.29Vpc at

20°C) with no load connected to the battery. In hybrid applications the

commissioning charge shall consist of 24 hours charge at a voltage

equivalent to 2.40 Volts/cell with no load connected.

Freshening Charge

Charge the monoblocs or strings at a constant voltage equivalent

to 2.29 to 2.4Vpc with 0.1C10 Amps current for a period of 24 hours.

Float Operation

EON Technology is designed for continuous float operation on

constant voltage chargers. Constant voltage charging is the safest,

most efficient and recommended method of charging VRLA batteries.

The recommended float voltage setting is 2.29Vpc at +20°C/+77°F.

Therefore the system voltage setting equals the number of cells in

series x 2.29Vpc.

Battery life and charging characteristics are affected by temperature.

Optimum battery life will be achieved when the battery is operating

between +20°C/+68°F and +25°C/+77°F (see figure 2).

Float Life

(Float @ 55°C using recommended FV for 20°C)

120

110

100

90

80

70

60

50

40

30

20

10

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Figure 2

Calculated Life (years @ 20°C)

Nominal Capacity (%)

Battery life is reduced by 50% for every 10°C/18°F increase in

temperature. Float voltage compensation reduces the charging

current as battery temperature increases and partially negates the

adverse effect of high temperature.

The recommended float voltage temperature compensation is:

• 2.29Vpc +4mV per cell per °C below 20°C

• 2.29Vpc -4mV per cell per °C above 20°C (refer to figure 3 for further

details)

Temperature compensation is capped at +40°C/+104°F as at this

temperature the compensated charge voltage approaches the natural

open circuit voltage of the battery and there is insufficient

overvoltage to keep the battery in a fully charged condition.

Float Volts Per Cell

2.35

2.34

Recommended Float Voltage

2.33

2.32

Minimum Float Voltage

2.31

2.30

Voltages > Recommended promote

2.29

overcharge & high float currents resulting

2.28

in accelerated end of service life

2.27

2.26

2.25

2.24 Voltages < Minimum recommended

2.23 result in undercharge, reduction in

2.22 capacity and irrecoverable capacity

2.21 loss leading to premature end of life

2.20

2.19

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Figure 3

Float Voltage Temperature Correction

Temperature (°C)

Charging Current

Recharge time is a function of the charging voltage and current.

In float applications where time to repeat duty is not so critical to

recharge in an acceptable time it is recommended that the current

limit should be a minimum level equalling the standing load plus

0.1C10 Amps.


Fast Charging

In addition to the long life characteristics inherent in traditional

PowerSafe ® SBS TPPL battery designs, EON Technology ® has been

developed to provide high performance in applications where the

battery is subjected to repeated cyclic duty, where power reliability

is tested by high temperatures and harsh conditions, combined with

remote locations.

Fast charge techniques are best utilised for frequent discharge cyclic

applications. The high charge acceptance of EON Technology is

suited for applications which require a faster recharge with reduced

time to repeat duty. In such applications the rectifier voltage should

be set at 2.40Vpc at 20°C. Figure 4 illustrates the time to full state of

charge from varying depths of discharge (C10) as a function of charge

voltage.

Recharge Time to 100% State of Charge following C10 Discharge

to Varying Depth of Discharge.

Compare Float Charge with EON Technology

110

100

90

80

70

60

50

40

30

EON Technology Fast Charge FV Recharge

20

10

0

0 2 4 6 8 10 12 14 16

Time to 100% State of Charge (hrs)

® Recharge Regime

(current limit 25% C10)

Figure 4

% Depth of Discharge (C10)

As with float charge, temperature compensation for voltage is

applicable to fast charge techniques. The profile below (figure 5)

gives the recommended compensation to charge voltage for

temperature.

Volts Per Cell

Fast Charge Temperature Correction

2.53

2.51

2.49

2.47

2.45

2.43

2.41

2.39

2.37

2.35

2.33

2.31

2.29

2.27

2.25

10 15 20 25 30 35 40 45 50

Temperature (°C)

Figure 5

In cyclic applications, optimal life and performance are obtained by

limiting recharge at 2.40Vpc to the time taken to return 103% of

discharged Ah before disconnecting the battery from the rectifier or

switching to float voltage. In systems where control of charge factor

is not possible, the battery will be returned to full state of charge

(from 100% depth of discharge C10) in 6.5 hours at 2.40Vpc with

0.25C10 Amps available. Higher charge currents will reduce charge

time, lower currents will increase charge time.

Where rectifier voltage cannot be adjusted to values >2.40Vpc to

compensate for lower temperatures, the time to reach full state of

charge will be increased. For additional information and guidance on

this, please contact your EnerSys ® representative.

Warning! Continuous charge at 2.40Vpc will significantly reduce battery

life.

Current Limit

In addition to the influence of charge voltage, the available charge

current will impact on time to repeat duty. The low internal resistance

of PowerSafe SBS EON Technology batteries lends itself to

absorption of in rush currents as high as 6C10 Amps but is equally

capable of operating with current limits as low as 0.1C10 Amps.

Figure 6 below illustrates the typical time to full state of charge

(2.40Vpc) as a function of available charge current from varying

depths of discharge.

Time (hrs)

0

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 110%

Figure 6

Depth of Discharge

Cycling

EON Technology has been developed to retain the long float life

characteristics associated with standard PowerSafe SBS technology

and has the added capability to deliver high performance in harsh

applications where cyclic duty predominates.

Extensive testing has shown that in traditional float cyclic

applications PowerSafe SBS EON Technology surpasses the excellent

performance of standard PowerSafe SBS battery designs, typically

delivering a 33% increase in the number of cycles during evaluation

to international benchmark standards (figure 7).

Cycle Life vs Depth of Discharge,

Compare Float Charge (PowerSafe ® SBS & SBS EON Technology ® )

Number of Cycles

10000

1000

SBS EON Float Charge

SBS Float Charge

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Figure 7

Depth of Discharge

Where it is not always economically viable to use higher charge

currents it has been demonstrated that increasing the charge voltage

at a given current limit, the time to full state of charge can be

radically reduced.

The electrochemical designs of PowerSafe SBS EON Technology

batteries have been developed to take advantage of this

characteristic. The low internal resistance ensures that PowerSafe

SBS EON Technology batteries can operate with charge current limits

ranging from 0.1C10 Amps to 6C10 Amps affording a high degree of

operating flexibility encompassing a wide range of operating

scenarios. It should be remembered that lower current limits increase

time to full state of charge, regardless of charge voltage (shown in

figure 8 below).

Effect of Charge Voltage on Recharge Time to 100% of Discharge Ah.

2.29Vpc vs 2.4Vpc following 100% DOD at various rates.

Current limit 0.4C10 Amps

Time to 100% of DCH Ah Returned

18

16

14

12

10

8

6

4

2

9

8

7

6

5

4

3

2

1

0

Figure 8

Time to Full State of Charge

As a Function of Current Limit and Depth of Discharge

(Recharge 2.40Vpc)

0.1C10 Amps

0.2C10 Amps

0.3C10 Amps

0.5C10 Amps

1C10 Amps

2.27Vpc 2.4Vpc

C1 C3

Discharge Rate

C10

0.1C10A

0.2C10A

0.3C10A

0.5C10A

1.0C10A

The high charge acceptance of PowerSafe SBS EON Technology

batteries that enables the use of fast charge techniques provides the

user with the advantage of reduced time to repeat duty and further

extends the number of cycles available during service life to

unparalleled levels (figure 9).

3


Figure 9

PowerSafe ® SBS EON Technology ®

Cycle Life as a Function of Depth of Discharge (C10 Rate)

(Charge Using Optimum EON Technology Recommendations)

Maintenance

In practice the user usually specifies the maintenance schedule based

on site criticality, location and manpower.

The following is a suggested maintenance schedule.

• Monthly (record all readings)

Measure the battery string voltage. If necessary, adjust the float

voltage to the correct value.

• Every six months (record all readings)

Measure the battery string voltage. If necessary, adjust the float

voltage to the correct value.

Measure individual bloc voltages. The blocs should be within 5% of

the average.

Inspect for contamination by dust, loose or corroded connections.

If necessary isolate the string/bloc and clean with a damp soft cloth.

Do not use solvents or scouring powders to clean the blocs.

Contact EnerSys ® if you have any questions regarding maintenance.

Disposal

PowerSafe ® SBS EON Technology ® batteries are recyclable. Scrap

batteries must be packaged and transported in accordance with

prevailing transportation rules and regulations. Scrap batteries must

be disposed of in compliance with local and national laws by a

licensed or certified lead acid battery recycler.

General Specifications

www.enersys-emea.com

Nominal Capacity (Ah) Nominal Dimensions

Connectors

PowerSafe ® SBS

Battery Type

Contact:

Connector Part No.

SBS B14, C11 2205-8919

SBS B14F, C11F 2205-8891

SBS 100 2205-8750

SBS 100F 2205-8749

SBS 170F & 190F 2205-8769

SBS 410 2205-9887 (A)

SBS 410 2205-8865 (B)

SBS B14, C11, 100

A

SBS 410

B

SBS B14F, C11F, 100F,

170F, 190F

PowerSafe ® SBS 10 hr rate 8 hr rate Typical Internal

Battery Nominal to 1.80Vpc to 1.75Vpc Length Width Height Weight Short Circuit Resistance Terminals

Type Voltage (V) @ 20°C @ 77°F mm in mm in mm in kg lbs Current (A) (mΩ)

SBS B14 12 62 62 280 11.0 97 3.8 264 10.4 19.1 42.0 1800 7.0 M8 F

SBS B14F 12 62 62 303 11.9 97 3.8 264 10.4 19.1 42.0 1800 7.0 M6 M

SBS C11 12 92 91 395 15.6 105 4.1 264 10.4 28.0 61.6 2300 5.5 M8 F

SBS C11F 12 92 91 417 16.4 105 4.1 256 10.1 28.0 61.6 2300 5.5 M6 M

SBS 100 12 100 100 395 15.6 108 4.3 287 11.3 32.6 71.9 2210 5.6 M8 F

SBS 100F 12 100 100 395 15.6 108 4.3 287 11.3 32.6 71.9 2210 5.6 M6 M

SBS 170F 12 170 170 561 22.1 125 4.9 283 11.1 52.5 115.7 3400 4.0 M6 M

SBS 190F 12 190 190 561 22.1 125 4.9 316 12.4 60.0 132.3 3800 3.3 M6 M

SBS 410 2 410 410 200 7.9 208 8.2 239 9.4 23.2 51.1 4725 1.3 M8 M

EnerSys

P.O. Box 14145

Reading, PA 19612-4145

USA

Tel: +1-610-208-1991

+1-800-538-3627

Fax: +1-610-372-8613

EnerSys Europe

Löwenstrasse 32

8001 Zurich, Switzerland

EnerSys Asia

152 Beach Road

Gateway East Building, Level 11

189721 Singapore

Tel. +65 6508 1780

EnerSys Ltd.

Oak Court

Clifton Business Park

Wynne Avenue, Swinton

Manchester M27 8FF

UK

Tel: +44 (0)161 794 4611

Fax: +44 (0)161 727 3809

© 2011 EnerSys. All rights reserved.

Trademarks and logos are the property of

EnerSys and its affiliates unless otherwise noted.

Publication No: EN-SBS-EON-AG-004 - April 2011 - Subject to revisions without prior notice. E.&O.E.

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