Rossi BT-280 User Manual Download Page 7

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12V/24V Heavy-Duty Battery Charger

E&OE

Operation

Substances used in batteries and gases or vapours produced when charging
may be extremely flammable

– keep clear of naked flames or other ignition

sources. • Correct battery polarity MUST be followed. Incorrect polarity may present an explosion or fire
hazard. • Do NOT attempt to charge a frozen battery. •

Do NOT connect to or charge the battery of a running

engine

. •

Failure to correctly follow the vehicle manufacturer instructions for in-vehicle charging or

jump-starting may damage vehicle electronics

• Do NOT connect the battery connect clamps to any part

of the fuel system or sensitive electrical components. • Position all charger  cables so they cannot contact
conductive  parts of the vehicle  (except the battery terminals), be pinched or caught etc. • Always select the
correct voltage  of  the battery  being  charged.  Do NOT  charger  a battery  using  a different  voltage  to the
battery rating. • Always follow battery manufacturer  instructions for  battery charging.   • If applicable,  before
charging,  remove  any battery cell ventilation  caps and  check that the  cell electrolyte  level  is adequate.  After
charging,  check electrolyte  level  and  re-

install battery cell ventilation caps. • Do NOT use "boost" charge

mode for longer than necessary to "revive" the battery.

The  battery charger  is suitable  for  charging  a range  of  high-capacity  (120  to 320Ah)  12V  and  24V lead-acid
batteries.  The  charger  features  a logic controlled  charging  program  that monitors  battery charge  and
switches modes  automatically to ensure  the  battery charge  is as close to 100% of  the original  capacity as
possible.

The  charger  can restore  almost completely  discharged  batteries  using  the "boost" charge  mode. This  mode
continuously  charges  at 5A (it does not  deviate)  and, therefore,  cannot  be  used for  the  full  charge  cycle, but
to "revive"  the battery sufficiently  so it can  be charged  normally.  In  "normal"  charge  mode,  it is possible to
leave  the charger  connected  to a battery indefinitely,  in which  case it will maintain  battery  charge  as required.

Charging Currents and Times

The battery charger does NOT automatically switch off when a battery is charged. It MUST
be switched off manually. Charging must be monitored often to prevent overcharging of the

battery. Over-charging a battery could cause personal injury and/or property damage.

The unit has various charge output currents depending on selections:

Selection

BT-280

BT-750

MIN

26A / 0.65kW

31A / 0.80kW

MIN

31A / 0.80kW

36A / 1.30kW

BOOST

33A / 1.00kW

43A / 1.60kW

BOOST

36A / 1.30kW

50A / 2.00kW

Use the following formula to calculate the approximate charge time for a battery:

Charge Time = Battery Capacity (Ah) / Charge Current (A) x Discharge Level (%)

For example, a 200Ah battery being charged at 50A from a 70% discharged state would be:

200 / 50 x 0.7 = 2.8 hours (168 minutes)

For example, a 320Ah battery being charged at 36A from a 40% discharged state would be:

320 / 36 x 0.4 = 3.6 hours (213 minutes)

Using Charging Cables

The charging (output) cables are colour-coded for polarity

–

RED

POSITIVE

and

BLACK

NEGATIVE

. To

use, squeeze the clamp to open the jaw, then place the jaw over the battery terminal and release the clamp.
Ensure that the clamp is firmly attached to the battery terminal.

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