How to Select Starting Battery Types for Diesel Generator Sets

During the startup process of diesel generator sets, batteries play a crucial role. Choosing and using the right starter batteries not only ensures the smooth startup of the generator set but also extends the equipment's lifespan. This article will introduce several common types of diesel generator starter batteries and their characteristics to help you better understand and apply these batteries.
 

1. Uncharged Batteries

Uncharged starter batteries have plates that are not charged during storage, and the battery does not contain any electrolyte. Before use, electrolyte must be added, and the battery must undergo an initial charge. Common lead-acid batteries fall into this category. The advantage of these batteries is their long storage life, but they require initial charging before use, making the preparation time relatively long.
 

2. Dry-Charged Batteries

Dry-charged batteries, also known as dry-charged lead-acid batteries, feature a high storage capacity in the negative plates. Even in a completely dry state, they can retain stored electricity for up to two years. Upon leaving the factory, the plates are already activated; users need only add standard density electrolyte and wait for 20 to 30 minutes before using the battery to start the diesel generator. The key advantages are the short preparation time and ease of use.
 

3. Wet-Charged Batteries

Wet-charged starter batteries maintain moist plates during storage to retain their charge. Their manufacturing process differs slightly from that of dry-charged batteries, and they have a shorter storage period. Generally, wet-charged batteries can be used after approximately six months of storage by adding standard density electrolyte, achieving 80% of the rated capacity on the first discharge. For wet-charged batteries stored for about a year, adding electrolyte allows immediate discharge of up to 50% of the rated capacity. A supplementary charge before use can bring them up to their rated capacity. These batteries are suitable for situations where long-term storage is not required, offering quick startup preparation times.
 

4. Valve-Regulated Lead-Acid (VRLA) Batteries

Valve-regulated lead-acid (VRLA) batteries, also known as sealed lead-acid batteries, have electrolyte absorbed in the separators and plates, with the separators being 90% saturated. This design eliminates free electrolyte, preventing leakage and allowing placement in any position. These maintenance-free batteries are ideal for applications requiring high reliability and low maintenance.
 

5. Wet Cell Batteries

Wet cell batteries contain electrolyte and maintain a charged state during storage. These batteries do not require additional electrolyte for use, providing short startup preparation times, making them suitable for applications needing rapid startup and frequent use.
 

6. Flooded Batteries

Flooded batteries, compared to VRLA batteries, contain a large amount of electrolyte and are also known as "flooded lead-acid batteries." These batteries offer high capacity and long life but require more maintenance, including regular checks and electrolyte additions.

By understanding the types and characteristics of various diesel generator starter batteries, you can select the most suitable battery type based on your specific needs. Uncharged and dry-charged batteries are suitable for situations requiring long storage periods, while wet-charged and wet cell batteries are ideal for rapid startup scenarios. VRLA and flooded batteries cater to low maintenance and high capacity demands, respectively. Choosing and using the right starter batteries ensures the smooth startup and reliable operation of diesel generator sets.