Yuasa NP Series, Installation Use & Care Instructions

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To allow emergency evacuation an unobstructed escape path shall be
maintained at all times with a minimum of 600 mm.

The installation of other equipment close to the battery must not make access
to the battery difficult.
5-2/ VENTILATION
YUASA NP/NPL/SW/SWL/EN/ENL/UXL/FXH/YFT/YUCEL batteries are
described as Valve Regulated Lead Acid batteries. Under normal floating charge
conditions, very little gas will be released.
YUASA NP/NPL/SW/SWL/EN/ENL/UXL/FXH/YFT/YUCEL batteries have a gas
recombination efficiency of more than 95%.
Good natural ventilation is enough to prevent all dangerous accumulations of
gasses ( see standards EN 50 272-2 or NFC15-100 ).
In case of overcharge, hydrogen and oxygen will be released from the battery. As
a result, the battery must never be installed in a gas-tight enclosure.
Sufficient precautions must be taken to avoid overcharge (monitoring the charge
system).
It is recommended that a space of 5 to 10 mm be provided between each
cell or monobloc to allow for easier ventilation. On site, this space should be
envisaged in the sense of the length of the site (small side of the monoblocs). In
cabinets, where there is less ventilation, at least leave a space between one of the
sides of the monoblocs.
The batteries can be installed near electronic equipment (following EN50272-2
standard). The heat dissipated by such equipment must be evacuated by ventilation.
5-3/ DIFFERENCES IN TEMPERATURE
The differences in temperature of the various cells or monoblocs making up a
battery cause differences in voltage in the same units. This perturbs the
performances of the battery.
External heating, sunlight, a natural air current or air conditioning can all be the
source of a difference in temperature.
Particular attention must be paid to reducing the differences in temperature
between the various cells or monoblocs of a battery.