4_Solar Battery Maintenance

8/7/2019 4_Solar Battery Maintenance

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C E A CSolar Open lead batteries

Exploitation andmaintenance of solar openlead batteries


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C E A CSummary

OPzS Solar batteries

Reminder

Charging profile.

Maintenance.Level topping up

Density checking

Check cleaness and connectionsDestratification charge

Cure charge

Discharge curves


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C E A CReminder

Capacity of OPzS Solar elements is in 120H

Optimum DOD: 15 20% of C120.

Exceptional DOD = 80% of C120.

The energy balance of the system must be positive

End of discharge voltage in C120 = 1,85V. (Load cut off)

Safety voltage:Safety low voltage = 1,90V.

Safety high voltage = 2,50V.

Electrolyte stratification to be avoided by eletrolyte mixing withovercharging or mixing device

Deep discharge could lead to cure charging


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C E A Charging profile for OPzS solar batteries

Charging profile with switch

technology

Without mixing device: Energy efficiency of thecharging is 81%

Setpoint between 2,45Vand2,30V.

Value for 20C (Correction of0,003V per

C)

1.90V

2.00V

2.10V2.20V

2.30V

2.40V

2.50V

Day Night


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C E A C

Charging profile with

destratification

Energy efficieny of the chargingis 83%

Morning charging for 1 hour at2,45V

Then at 2,30V (or 2,30V and2,10 to 2,23V)

Value for 20C (Correction of0,003V per

C)1.90V

2.00V

2.10V

2.20V

2.30V

2.40V

2.50V

Day Night

Charging profile for OPzS solar batteries


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C E A COPzS Solar maintenance

Maintenance for OPzS solar batteries consist of

Level topping up

Density checking before topping up

Cleaness check

Connection check

Destrtaification load if necessaryCure charge if necessary


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C E A C

Level topping up

The mantenance frequency for solar batteries is very low, it is

inferior to the maintenance required by the charge controller

But at each visit to the site it will be good to top up the batteries

Switch charging profile including morning gas charge

1 year

Switch profile with set points at 2,23Vand 2,27V, with use ofFulmix device

Frequency 2 to 5 years

OPzS Solar maintenance


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C E A C

Befor topping up batteries you must check the batteryelectrolyte density

Density must be as follows:Level at MAXI and full SOC estimated = 1,240 0,01

Level at MAXI and 80% OSC estimated = 1,210 0,01

Level at AVERAGE and full SOC = 1,260 0,01

Level at AVERAGE and 80% SOC = 1,230 0,01

If the values are below it means, either that the SOC is lower orthat there is an electrolyte stratification

A destratification charge must be conducted, if not sufficient acure charge must be conducted



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C E A C

Cleaness and connection checking

When topping up the batteries :

Clean the cells lid

AND

Check connectionsRemove sulfatation tracks with water or Ammonia solution (4%)Grease the connections with silicon grease

Checck the tightening torque of the connections.



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C E A C

Destratification charge :

At least weekly when no Fulmix or morning gassing

Levels :

Leave voltage up to 2,60V or maintain over 2,45V during 3 to 5hours



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C E A C

Cure charging

If the battery is deeply discharged > 35% DOD, a cure chargingmust be conducted

In case the battery remains discharged for a long period, a curecharge is required.



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C E A C

Cure charging procedure

Charge the battery between 0,02 and 0,04 C100 until end ofcharge signs

Voltage stabilisation of decrease due to temperature effect.

Density close to start up values

Electrolyte temperature must not exceed 45C during charge.Otherwise reduce the charging current or stop the charge untilcooling



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C E A C

lment SOLAR

Dcharges diffrents rgimes

Densit 1,240 25C au niveau maxi

1 10 100 1000

1.80

1.85

1.90

1.95

2.00

2.05

2.10

Rgimes de dcharge

0.004 C100

0.008 C100

0.01 C100

0.014 C100

0.019 C100

0.035 C100

0.0075 C100

CEAC SAV Central 02/03/94

OPzS Solar Discharge curves

4_Solar Battery Maintenance

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