Operation Guide > PowerSafe
®
PV Bloc <
4
Charge Effi ciency
The charge ef
fi
ciency is the ratio between the quantity of Ah delivered during the discharge and the quantity of Ah
necessary to restore the initial state of charge.
State of Charge (SOC)
Ah Ef
fi
ciency
90
> 85
75
> 90
<50
> 95
1 GENERAL OPERATING INSTRUCTIONS
1.1 Operating Temperature Range
The recommended operating temperature range for PowerSafe
®
PV Bloc is -15°C to 40°C (Humidity <90%). Optimum
life and performance is attained at +25°C.
All technical data relates to the rated temperature of +25°C.
1.2 Storage
Store the battery at a dry, clean and preferably cold and frost-free location. Do not expose the cells to direct sunlight.
Limit values for storage conditions: Temperature range of -20°C to +45°C, Humidity <90%
The self-discharge rate of PV Bloc batteries is a function of the temperature.
Temperature
25°C
30°C
40°C
Monthly self-discharge rate
3%
4%
8%
PowerSafe
®
PV Bloc has a shelf life of 5 months when stored at 25°C. Higher temperatures increase the rate of self
discharge and therefore reduce storage life.
This table gives the
maximum
storage period before refresh, at the given average storage ambient temperature:
Average storage
ambient temperature
Maximum storage time
20ºC
6 months
25ºC
5 months
30ºC
4 months
40ºC
2 months
The table hereafter gives an indication of the state of charge of the cells from a reading of the open circuit voltage (OCV).
PowerSafe
®
PV Bloc must typically be recharged when they fall to ~75% state of charge.
State of charge
Voltage per cell *
100%
2.13 Vpc
70%
2.09 Vpc
50%
2.06 Vpc
20%
2.02 Vpc
* (Multiply thess voltage by 3 for 6V bloc and by 6 for 12V bloc)
