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Maintenance content of diesel engine generator batteries

Time：2026-03-28 15:19:19 Edit：HuaQuan Traffic Index：590

The diesel engine generator battery is the core component that ensures the reliable start of the unit. It is the key starting component of the entire power generation system and provides the initial power for starting the diesel engine.

I. Characteristics of diesel engine generator Batteries
Diesel engine generator batteries are mainly 24V lead-acid batteries. Their characteristics are stable voltage and low internal resistance. They are divided into two types: maintainable dry-charged batteries and maintenance-free batteries.

II. Advantages of Diesel engine generator Batteries
1. Strong starting performance: Diesel engine generator batteries can provide an instantaneous high current of 200-600A, and even over 1000A, to the starter motor in a short period, overcoming the high compression resistance of diesel engines and ensuring a quick and reliable start.
2. Stable and reliable voltage: As lead-acid batteries, their output voltage is stable, providing a reliable DC power supply for the diesel engine's starter motor (usually a 24V system) and control system.
3. Convenient maintenance: Modern Diesel engine generators generally use maintenance-free batteries. They consume little electrolyte, require almost no distilled water during their service life, and have features such as vibration resistance, high temperature resistance, small size, and low self-discharge. Their service life is usually twice that of ordinary batteries.
4. As an emergency power source: When the generator is not operating or the output voltage is insufficient, the battery can provide backup power for key equipment such as the Diesel engine generator's control system, instruments, and lighting, ensuring uninterrupted monitoring and operational functions.

III. Maintenance Content of Diesel engine generator Batteries
1. Daily Inspection and Cleaning of Diesel engine generator Batteries
Daily inspection is the foundation of maintenance. The electrolyte level of the battery should be checked daily or weekly to ensure it is 10~15mm above the top surface of the plates. If the level is too low, distilled water should be added promptly; river water, well water, or ordinary tap water must not be used. At the same time, the exterior of the Diesel engine generator battery should be kept clean and dry. The casing, terminals, and connection posts should be wiped regularly with a damp cloth to remove dust, oil stains, and white powder that may cause leakage. It is also necessary to check that the connections are secure, and a layer of grease can be applied to the terminal surfaces to prevent oxidation.
2. Regular Charging and Status Monitoring
Diesel engine generator batteries should maintain sufficient charge. For Diesel engine generator that are not used for long periods, the Diesel engine generator battery should be recharged at least once a month to prevent self-discharge from depleting the battery and causing irreversible sulfation damage. After discharge, the battery should also be charged in a short period. The battery voltage should be measured regularly with a multimeter, or after starting, check each battery cell for bubbling to determine if the charging status is normal. In addition, the electrolyte specific gravity should be checked regularly; measuring it with a hydrometer can judge the battery's charge condition.
3. Charging Operation Specifications and Safety of Diesel engine generator Batteries
Charging is an important part of maintenance. During charging, an original or parameter-matched charger must be used, as the wrong charger may cause undercharging, overcharging, or even damage the Diesel engine generator battery. The charging environment should be well-ventilated and away from moisture, high temperatures, and flammable or explosive materials. Covering the charger with any object is strictly prohibited to prevent heat accumulation and fire. When connecting cables, connect the positive terminal first, then the negative; when disconnecting, the order is reversed. During charging, the Diesel engine generator battery’s filler caps should be unscrewed to keep the vent holes unobstructed, preventing excessive internal pressure that could damage or rupture the casing.
4. Usage and Storage Precautions
Proper use can prolong the life of Diesel engine generator batteries. When starting the diesel engine, a single start should not exceed 10 seconds. If the start fails, wait more than 2 minutes before trying again to avoid continuous high-current discharge that may damage the plates. In cold regions, attention should be given to insulating the battery and appropriately increasing the electrolyte specific gravity to prevent freezing. If the Diesel engine generator is idle for a long time, it is recommended to remove the battery and store it in a dry, ventilated, and temperature-suitable place, recharging regularly. Additionally, it must be remembered that hydrogen, which is flammable and explosive, is generated during battery charging and discharging; sparks or open flames must be kept away from the battery. ...

IV. Q&A on Diesel engine generator Batteries
1. How should Diesel engine generator be maintained if not used for a long time?
They should be given a topping charge once a month to prevent discharge and plate sulfation.
2. What should be paid attention to when charging Diesel engine generator batteries?
The charging environment should be well-ventilated and away from open flames; the filler caps should be opened; use a matched charger to avoid overcharging.
3. Under what circumstances should Diesel engine generator batteries be replaced?
If there is casing bulging, leakage, or the voltage remains severely insufficient after charging (e.g., below 24V in a 24V system) and cannot be restored by charging, replacement should be considered.
4. What are the safety risks of Diesel engine generator batteries?
The electrolyte is highly corrosive; during charging, flammable and explosive hydrogen is released, and it must be kept away from sparks and open flames. Protective goggles and gloves are recommended when operating.

Huaquan Power was established in 2010 and is located in Weifang, Shandong. The company's industry involves multiple fields including power generation equipment, new energy storage equipment, high and low voltage complete sets of equipment, and power engineering.
Huaquan Power's products incorporate multiple technologies such as intelligent monitoring, brushless excitation, low emissions, and noise reduction. In manufacturing, the company is based on lean management, combining informatization and industrialization, and has introduced intelligent equipment such as fully automated spraying lines, industrial welding robots, and AGV intelligent transport platforms. It has full-process production capabilities including material cutting, forming, machining, welding, painting, and installation commissioning.
Huaquan Power provides a service system covering pre-sale, in-sale, and after-sale periods. The after-sales service network has a wide coverage and responds quickly, ensuring users can use the products with confidence.
More information about diesel engine generator: http://www.fadianjidl.com/