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
OPzS Solar maintenance
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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
OPzS Solar maintenance
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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.
OPzS Solar maintenance
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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
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