Bi1248
‐
1200
User
Manual
2
2.
Description
of
main
Function
2.1
General
Description
Bi1248
‐
1200
is
a
bi
‐
directional
converter
charger
for
vehicles
or
boat
which
has
dual
battery
system
installed.
It
was
designed
to
charge
48Vdc
auxiliary
battery
on
a
12Vdc
chassis.
Due
to
its
bi
‐
directional
design,
the
12Vdc
load
can
be
powered
as
it
used
to
be.
Upon
driving
or
engine
on,
through
this
device,
the
output
of
12Vdc
alternator
can
be
used
to
charge
48Vdc
auxiliary
battery
and
meantime
power
the
12Vdc
loads.
Upon
engine
stop,
this
device
will
convert
48Vdc
into
12Vdc,
powering
all
12Vdc
loads.
Traditional
alternator
:
When
the
device
detects
that
the
starter
battery
voltage
is
higher
than
13.3V,
it
will
takes
power
from
alternator
to
charges
the
48V
auxiliary
battery
with
a
maximum
charging
current
of
25A.
Upon
the
starter
battery
voltage
is
lower
than
12.8V,
this
device
will
stop
working.
Smart
alternator
/
Euro
6
:
Through
dip
switch,
this
device
can
be
set
to
smart
alternator
mode.
After
choosing
this
mode,
IGN
signal
or
similar
signal
wire
must
be
connected.
Combined
with
IGN
signal
and
voltage,
the
device
will
decide
the
charging.
Charging
:
IGN
active
and
starter
battery
voltage
is
higher
than
12.2V
Stop
charging:
IGN
active
and
the
starter
battery
voltage
is
lower
than
11.6V.
2.2
Product
principle
The
Bi1248
‐
1200
adopts
a
non
‐
isolated
conversion
topology
with
high
efficiency
up
to
94%
or
above.
Adopting
DSP
control,
complex
control
algorithms
can
be
achieved
and
meantime
featuring
high
control
precision
and
fast
response
speed.
After
the
starter
battery
and
the
service
battery
are
connected
to
the
unit,
as
well
as
the
IGN
signal,
the
unit
can
independently
implement
the
charge
and
discharge
and
maintain
the
reliable
operation.
With
built
in
isolated
RS485
and
CAN
communication,
it
can
be
used
for
any
system
with
monitoring
and
control
requirement.
