CHARGING PERFORMANCE
Honda BF250 Engine
1
What features enhance the charging performance of the new Honda BF250?
When the electric load on the new Honda BF250 increases, an adjustable idling-charge
system enhances the charging performance of the engine. The BF250 has an industry-first,
AMP Plus (Amp+) feature which, at idle speeds, senses a need for more amperage and
automatically raises the engine rpms by 100 to produce an additional nine amps. This is
perfect for simultaneously running accessories such as SONAR, GPS, stereo, live wells and
trolling motors. The below diagrams illustrate how this system works under specific operating
conditions.
[ ChargingTested
output
Electrical Consumption
at]90 degrees C
Conditions: Self consumption subtracted at 90 degrees C
Charging output (A)
40
Idling is raised by 100 rpm, and the
charging output increases by 9 A.
30
When the electric devices consume
more power, the ECU raises the
idling speed.
20
0
650
750
850
950
Engine speed (rpm)
When the charged power becomes
insufficient because of the
increased load, the idling speed is
automatically raised to increase
the charging power.
When the gear is engaged, the
control is stopped to reduce the
engine speed.
Load image
Vessel
Self
consumption accessories
up to 15 A
5A
Fish school
Refrigerating
detector
cooler box
(continuous load) (continuous
up to 4 A
load)
up to 10 A
Electric slicer
(intermittent load)
20 - 40 A
Winch
(intermittent
load) 15 A
Large
Charging power
Small
Engine speed
Shift position
750 rpm
650 rpm
650 rpm
Neutral
Clutch
engaged
Time (t)