Vector VEC092 Owner's Manual & Warranty Information page 11

APPENDIX A
-
CHARGING
TIMES
To
calculate the
approximate charging
time required
to
fully
charge a
battery,
it
is
necessary
to
determine
th
specific
gravity
(or,
percent
of battery
charge)
using
a
hydrometer.
Use
this
technique
if
battery vent
caps ca
be removed. Check each
cell.
If
there
is
one
cell
with
a very low
specific
gravity
compared
to
the other
cell:
there
is
probably a
shorted
cell in
the
battery.
Replace
the battery.
The
following chart converts hydrometer
readings
into
percent
of
charge
values.
SPECIFIC
GRAVITY
(HYDROMETER
READING)
1.265
1.225
1.190
1.155
1.120
PERCENT OF CHARGE
PERCENT OF
CHARGE
NEEDED
IN
BATTERY BY BATTERY
100%
75%
50%
25%
Refer
to
the chart
below
for
approximate charging
times.
PERCENT OF
CHARGE
75%
50%
25%
2
AMPS
10
AMPS
20
AMPS
35
AMPS*
6.5
HRS
1
.8
HRS
1
HRS
NR**
12
HRS
3.0
HRS
1
.5
HRS
NR**
N.R***
4.5
HRS
3
HRS
NR**
0%
25%
50%
75%
100%
0%
N.R***
6
HRS
3.5
HRS
NR**
*
For
Charging
Batteries
80
to
100
AH
(not for
this
example)
**
Not Recommended
for
more
than
1
hour
***Not
Recommended
because over 18
hrs
charging
time.
The
times
shown
in
the
chart
above
are
approximate and
refer to
an average
automotive
battery.
For
smalle
batteries, the
charge
time should be
adjusted using the formula
shown below and
adding
1
hour
to
the tim
calculated.
To estimate
charging
time
for
a
discharged
battery,
divide the
AH
rating of the battery
by
the
charge
rate selectee
This
is
the
number
of
hours required
to
recharge
the
battery.
For
example, a
50
AH
(12 volt)
battery
i
discharged
(10 volts).
How
long should
it
be charged
at the
20
Amp
rate.
Divide the
50
AH
by
20.
The answe
is
approximately 2.5
hours.
Always
round up
the
charge
time
by 10%
to
ensure
full
charge.
In
most
cases,
ba
tery
recharge
times
will
vary depending
on
the
age and
condition of the
battery.
Smaller
batteries
should b
charged
at
a
lower
rate (2
Amps) and add an
extra
hour
to
charge
time.
VEC091