Battery and Starting Systems Flashcards

What is the typical recommended maintenance interval for checking electrolyte levels in flooded lead-acid generator starting batteries?

Answer: Monthly or per manufacturer's recommendation

Flooded lead-acid batteries should have electrolyte levels inspected monthly or per the manufacturer's schedule since water is consumed during charging and evaporation, and low levels expose plates to air causing irreversible damage.

Which battery interconnect configuration is used to increase battery bank voltage to 24V for a generator set originally designed for 12V starting?

Answer: Connecting batteries in series

Connecting batteries in series adds their voltages together — two 12V batteries connected positive terminal to negative terminal produce a 24V supply while maintaining the same Ah capacity.

What is sulfation in a lead-acid battery, and when does it occur?

Answer: Crystallization of lead sulfate on battery plates, which occurs when a battery remains in a discharged state for extended periods

Sulfation occurs when lead sulfate crystals harden on battery plates during prolonged discharge or storage, reducing active plate material and permanently diminishing battery capacity and performance.

What type of battery charger is preferred for maintaining standby generator batteries because it automatically adjusts output to maintain a constant voltage?

Answer: Constant-voltage (float) charger

Constant-voltage float chargers maintain a fixed voltage (typically 13.5–13.8V for 12V VRLA batteries) and automatically reduce current as the battery approaches full charge, preventing overcharging during indefinite standby.

What safety precaution must be observed when adding water to a flooded lead-acid battery?

Answer: Add only distilled or deionized water and never add acid unless electrolyte has been physically spilled

Only distilled or deionized water should be added to flooded batteries to avoid introducing minerals that contaminate the electrolyte; acid should only be replaced if electrolyte was physically lost through spillage.

What is the function of the pinion gear and solenoid in a generator engine starter motor?

Answer: The solenoid engages the starter circuit and drives the pinion gear into mesh with the ring gear on the flywheel

When energized, the solenoid simultaneously closes the high-current starter circuit contacts and mechanically drives the pinion gear into engagement with the engine flywheel ring gear to transmit cranking torque.

What does a battery's Reserve Capacity (RC) rating indicate?

Answer: The number of minutes a fully charged battery can supply 25 amps before voltage drops below 10.5V

Reserve Capacity (RC) is the number of minutes a fully charged battery at 80°F can be discharged at 25 amps while maintaining at least 10.5V, indicating how long it can sustain auxiliary loads if the charging system fails.