3
4. Installation
Each monobloc is supplied with the terminal/connector fasteners.
On each monobloc the positive terminal is identified by a “+” symbol. Install
the batteries in accordance with the instructions and/or layout drawing,
taking care to ensure correct terminal location and polarity.
Connect the blocs with the connectors and fasteners provided. The fastener
torque value is indicated on the product label.
Place the insulating covers in position immediately after tightening the
fasteners.
5. Operation
5.1. Standby / Float Operation
Constant voltage chargers are recommended. The charging voltage should
be set at the equivalent of 2.29Vpc at 20°C/68°F or 2.27Vpc at 25°C/77°F.
The minimum charging voltage, at any temperature, is 2.21Vpc. The
recommended float voltage temperature compensation is as follows:
Disconnecting the battery from the load when the recommended end
voltage is reached will eliminate the risk of over-discharge. We recommend
that the charge voltage is reapplied within 24 hours, up to a maximum of 7
days, of any discharge.
5.2. Charging Current
Due to the very low internal resistance PowerSafe
®
V-FT monoblocs will
accept unlimited current during recharge but for cost and practial purposes
in float applications where recharge time to repeat duty is not critical, the
rectifier current can be limited to the load plus 0.1C
10
Amps.
5.3. Grid Assist Cycling Applications
In instances where the time time to repeat duty is critical the charge voltage
should be set to 2.40Vpc at 20°C, with the rectifier current limit set to a
minimum of 0.1C
10
A. Fast charge should be stopped and reverted to float
voltage once full state of charge is reached.
5.4. Periodic Boost Charge
In normal operation a periodic boost charge is not required. However, in
some cases such as when there has been no discharge duty over a 12
month period, a boost charge equivalent to 2.40Vpc at 20°C for maximum of
10 hours can be applied.
6. Maintenance
In practice, the user usually specifies the maintenance schedule based on
site criticality, location and manpower.
However, the following may be used as a suggested maintenance schedule.
•
Monthly (record all readings)
Measure the battery string voltage. If necessary, adjust the float voltage
to the correct value.
•
Every six months (record all readings)
Measure the battery string voltage. If necessary, adjust the float voltage
to the correct value.
Measure individual bloc/cell voltages. The blocs/cells should be within 5% of
the average.
Inspect for contamination by dust, lose or corroded connections.
If necessary, isolate the string/bloc/cell and clean with a damp soft cloth.
Warning: Do NOT use any type of oil, solvent, detergent, petroleum-based
solvent or ammonia solution to clean the battery containers or lids. These
materials will cause permanent damage to the battery container and lid and
will invalidate the warranty.
Contact EnerSys
®
if you have any questions regarding maintenance.
7. Disposal
PowerSafe V-FT batteries are recyclable. Scrap batteries must be packaged
and transported in accordance with prevailing transportation rules and
regulations.
Scrap batteries must be disposed of in compliance with local and national
laws by a licensed or certified lead acid battery recycler.
Temperature (°C / °F)
10/50
15/59
20/68
25/77
30/86
35/95
40/104
Recommended
2.33
2.31
2.29
2.27
2.25
2.23
2.21
Minimum
2.31
2.29
2.27
2.25
2.23
2.21
2.21
