BATTERIES
VASUDEVAN PONDICHERRY PH: 91 96299 80476
BATTERIES
BATTERY ON- OFF LOAD CHECK
Supply
is coming from ship’s main.
This
is Battery off-load.
Now
switch off the main power feeder.
Now
supply is coming from the battery. This is on load to the battery.
In
Battery on-load, make a blind test call on a working frequency on full power.
Observe
the voltage in the meter.
The
voltage drop should not go beyond 1 to 1.5 V
If
it falls beyond 1 to 1.5 V, it is the time for the Battery to be charged.
(You
can practice this in SIMULATOR. Below SAT C BDU, you can see the battery icon.
Click on this)
What is Battery off load?
Power
supply coming to the GMDSS equipment is from the ship’s main.
What is Battery on-load?
The
power supply is coming from the Battery.
GMDSS
equipment is on=load to the Battery.
BATTERY CAPACITY TEST
YEARLY TEST
Batteries must be fully charged.
After fully charged,
Specific gravity and Voltage of each cell reading to be
noted down.
Then make a Electrical board of 5
bulbs connected in parallel.
5 bulbs are in parallel connection.
Each bulb is 100W/24V
Connect this electrical board to the
Battery
Discharge for six hours
Every hour, take readings of specific
gravity and voltage of each cell
This report to be submitted at the
time of inspection/survey
(NOTE:
EACH BULB IS 100 WATTS/24 VOLTS
WAATS/VOLTS=
AMPS
100/24=4.4
AMPS
5
BULBS IN PARRALEL= 5 X 4.4 = 22.0 AMPS
GMDSS
ALL EQUIPMENTS ON CONSUMPTION = 20 AMPS)
After the Battery Capacity test, what
will you do?
Let
the Battery gets cool down
After
that, recharge the Batteries.
It
should be fully charged again.
Why is five bulbs of 100W/24V in parallel
connection chosen for Battery
Capacity test?
5
bulbs of 100W/24V in parallel = all GMDSS equipment on-load
5
bulbs of 100W/24V in parallel is equivalent to keep all GMDSS equipments
On
load.
If the battery is not in good
condition, how will you find out?
In
Battery Capacity Test, if there is a lot variations in the readings,
It
is not in good condition.
If the battery is not in good
condition, what will you do?
We
should indent for a new Battery.
How will you indent for a new Battery
for GMDSS equipment?
OR
What is the good condition of GMDSS
equipment Battery?
2
numbers of LEAD ACID Battery – specific gravity of 1250 –
Voltage
of 2.2V per cell – and Battery capacity of 200 AH
Can we use 180 AH Battery for GMDSS
equipment?
We
can use 180 AH or 200 AH capacity Battery whichever is available
In
the market
Consumption
of GMDSS equipment is 20 AH
180
AH Battery – for continuous usage for 9 hours
200
AH battery – for continuous usage is 10 hours
As
per GMDSS regulations,
Battery
should be able to work continuously with GMDSS equipments ON-LOAD
Is
6 hours
If the Motor Generator is the
alternate source of energy, how will you maintain?
If
the motor generator is the alternate source of energy to the GMDSS
Equipment,
Then-
Run
the Generator ON-LOAD and observe for its good working.
Make
a log entry about it.
From where is the supply coming to
GMDSS equipment?
From
ship’s main
What is the alternative source of
power supply/RSE ?
Battery
What type of battery is used?
Lead
Acid battery. It is a secondary battery.
What does secondary Battery mean?
It
means it is a rechargeable Battery.
What is primary Battery?
It
can not be recharged.
How is the specific gravity measured?
With
HYDROMETER
How often do you do the battery on-off
load check?
Daily
Why do you do the battery on-off load
check?
To
check the charge level of the battery
Why do you conduct the battery
capacity test?
To
see the good condition of the battery
As
per GMDSS regulations, this battery should be able to take the load of GMDSS
equipment for at least 6 hours continuously.
How often do you conduct this battery
capacity test?
Yearly
What is ‘Capacity’ of a battery?
Amount
of energy delivered in a standard period of time is called Capacity
Of
a battery
It
is measured in ampere hour - AH
How much current is consumed by GMDSS
equipment?
20
AH
Why is Lead Acid Battery preferable?
Lead
Acid Battery is capable of delivering extremely high current, running
Into
hundreds of amperes
Precautions to be taken while working
on batteries
Make
sure that battery lockers/compartments are well ventilated at all times &
specially before entering
No
naked flames near batteries
Do
not smoke near batteries
Do
not use the battery compartments as storage lockers.
in
heavy weather, things may fall across the batteries causing short circuit
which
can lead to fire or explosion
Always
wear goggles, safety shoes, rubber gloves, and safety clothing.
Do
not drop any tools on the battery terminals as this cause a short circuit
If
at any time, electrolyte has to be made up always add acid to water never add
water to acid.
Battery
What is battery?
cells
together form a battery.
What is primary battery?
Primary
cell is one which cannot be charged after use.
.what is secondary battery?
Secondary
cell is one which after discharge can be charged and used again (Rechargeable)
What type of battery is used for GMDSS
equipments?
The
most commonly used battery for ships GMDSS equipments is the Lead acid battery.
It
is a secondary battery (rechargeable battery)
What is the fully charged battery
condition?
fully charged each cell has an output voltage
of 2.2 volts.
Capacity of battery means?
Ampere
Hour capacity is the amount of energy that a battery can deliver over a
standard period of discharge time.
Specific Gravity of battery?
Fully
charged lead acid cell will show a specific gravity of 1250
A
dead cell would show a Sp. Gr of 1150
(The Sp. Gr of a cell is a better indication than the
voltage of the cell because even a fully discharged cell could show a reading
of 1. 95 volts)
What is
specific gravity?
Specific gravity = the ratio between the density of the
water and to that of the liquid
(Hydrometer mercury shows the readings)
What is Sulphation?
If
the cell is left in a discharged state for a longer period then sulphation
takes place
What is Buckling?
If
the cells are over charged the plates bend due to heat. This could even result
is the plates short circuiting.
Is Automatic
Charging provided?
The
SOLAS Convention requires that, if storage batteries are used as the reserve
energy source, they must be provided with automatic charging arrangements.
Where is the Lithium battery used?
Lithium
battery is used in EPIRB, SART and the GMDSS VHF
What are the special features of
Lithium battery?
A
lithium battery of 18 volts is used for the above mentioned safety equipments.
Lithium
batteries require nil maintenance,
have
a long shelf life period,
leak
proof,
and
are capable of delivering a steady discharge current over an extended period.
BATTERIES
secondary battery, Lead Acid battery
Positive plate – anode – Lead peroxide
Negative plate – Cathode – Spongy lead
Dilute sulfuric acid: Distilled water
1: 3
Fully discharged voltage level – 1.95 V
SP/ Gravity: 1250 – 1150
