17
12-4/ PREPARATIONS AND CONTROLS TO BE CARRIED OUT ONE WEEK
BEFORE THE AUTONOMY TEST (D-7)
a/ Ensure that the temperature of the battery blocks at different points is situated
between +15°C and + 25°C, bearing in mind that the ideal temperature is 20°C:
Average T = ………….°C
b/ Put the charging battery in floating voltage (see Data in 12-2). If the temperature is
not 20°C, adjust or compensate for this floating voltage at -3mV/°C/cell.
Floating U measured = ………….V
c/ Ensure that the floating voltage in each block in each string is within the -2% /
+6% range of the floating voltage at 20°C,SWL/FXH 2.275V/cell, EN 2.26V/cell.
or 13.2V and 14.4V (for 12V blocks).
or 6.6V and 7.2V (for 6V blocks).
or 2.21V and 2.40V (for 2V blocks).
If it is not possible to measure each block, do a single measurement per group (4 or
5 blocks at once) to verify the homogeneity of the voltages, or per sample (5 mini
battery blocks per string).
Blocks whose voltage is not within this range must be monitored or replaced: contact
Yuasa.
To reduce the charge time to 5 days, it is possible to carry out a boost charge at
2.35V per cell for 24h with a return to floating for 4 days. For other voltages or times,
please contact Yuasa.
12-5/ AUTONOMY TEST (D DAY), CONTROL
a/ Ensure that the temperature of the premises has remained constant and that the
battery has not undergone a discharge since D-7.
b/ Ensure that the floating current is close to 0 (around 1mAh/Ah).
c/ Re-verify on a few blocks in each string that the floating voltages are within the -
2% / +6% range (see 12-4c/).
d/ Verify by sweeping each block with the thermal camera that the batteries are at the
same temperature as the premises (+2°C max).
Min. T = ……….. °C Max. T = ……….. °C Average T = ………. °C
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