HEAVY DUTY ELECTRICAL CBC

SIZE IS IMPORTANT! THE LARGER THE ENGINE, THE LARGER THE BATTERY NEEDED. ELECTRICAL SYSTEMS VITAL TO EQUIPMENT OPERATION

TYPE OF BATTERIES Most batteries used in heavy duty equipment are lead acid units Battery maintenance in crucial on heavy equipment. Batteries are tougher for heavy duty use.

BATTERY CAPACITY Rating is determined by number and size of plates per cell Strength and volume of electrolyte assist in battery output Capacity defines the battery’s ability to deliver a given amount of cranking power. The larger the engine, the more battery capacity needed.

CONSTRUCTION Case is made of acid resistant material Hold down lugs Plate supports inside Subdivided into cells Battery cover contains cell vents Different types of bat. terminals

BATTERY HOOK UP Systems can be designed to operate on either 12V or 24 volt Most North American vehicles operate on 12V European vehicles operate on 24V Both hook ups have advantages and disadvantages

BATTERIES IN SERIES Voltage of Series Batteries are added together Cold Cranking Amperage stays the same as one battery Provides a greater reserve of power Some systems use a series-parallel switch to provide 24V cranking with 12V charging

PARALLEL HOOK UP Parallel hook up of batteries provide greater amperage System voltage is the same as with one battery Due to less cable connections, voltage drop for starting is minimal Large diesel engines use 8DR205 batteries

12 VOLT PARALLEL SYSTEM Provides higher amperage Four batteries = 2000 amps (4x500 CCA) Larger Batteries, less connections provide less chance for poor engine cranking performance

SERIES-PARALLEL SYSTEM Provides higher voltage Provides less amperage Provides 24 volt starting and 12 volt charging Some 12 volt systems use four 6 volt batteries

BATTERY CABLE TERMINALS BAT ARE MARKED WITH POS OR NEG POSITIVE POST IS LARGER THAN NEGATIVE POST TERMINALS MUST BE KEPT CLEAN AND TIGHT APPLICATION OF LIGHT GREASE PREVENTS CORROSION

BATTERY EFFICIENCY COLD IS ENEMY TO LEAD-ACID BATTERY POOR MAINTENANCE ON ENGINE WILL AFFECT STARTING MUST KEEP BATTERY WARM KEEP BATTERY CLEAN

BATTERY MOUNTING Battery carriers and hold downs must be designed to carry heavy loads Brackets should have acid resistant coating Rubber sheet padding to help vibration Keep away from heat Frame Rail Mounting

BATTERY MOUNTING Cables and terminal fittings should conform to TMC cable insulation regulations Cable routing and support practices must be correct Parallel to chassis side frame rails

BATTERY MOUNTING Battery boxes should be inspected on a regular schedule Covers should be easily accessible Covers should be easily removable Clamps and Insulation must be in place and operable On top of Fuel saddle tanks

BATTERY MOUNTING Batteries must be protected from elements Ground cables must be secured and in place Positive cables and terminals must be in good state of order Mounted between chassis frame rails

Battery Ground Cables SAE specifies three types of cables #1 - SGT - Starter or Ground, Thermoplastic insulated #2 - SGR - Starter or ground, synthetic rubber insulated #3 - SGX - Starter or ground, cross-linked polyethylene insulated

The End