Different Technologies for Different System Challenges
A DC/DC converter is designed to transform one DC voltage level into another. In mobile equipment, converters are commonly used to provide a defined and regulated output for auxiliary loads such as control systems, lighting, communication devices, displays, sensors and safety electronics.A DC/DC equalizer does more than voltage conversion. It is most often used in 24V systems built from two 12V batteries, where the vehicle may also need access to 12V power for selected loads.
Instead of only converting voltage, the equalizer helps maintain balance between the two batteries. 12V loads in the system are supplied by the equalizer up to its current limit. If additional current is required for a short period, the excess current is drawn from one of the batteries. Once the transient load has subsided, the equalizer restores the balance between the two batteries.
Without corrective balancing, the weaker battery may continue to degrade faster. In many cases, if one battery becomes significantly worse than the other, both batteries must be replaced together; otherwise, the imbalance will quickly return. Compared with replacing both batteries, an equalizer can therefore be a cost-effective preventive measure.
- Reduced battery capacity
- Shortened service life
- Increased maintenance and replacement costs
Why Battery Imbalance Is Often Overlooked
Battery imbalance is a gradual process. Series-connected batteries rarely age identically, and auxiliary loads connected across a single battery can amplify differences over time.This challenge can occur in applications where 24V battery systems supply uneven 12V loads, especially when reliability requirements are high and unexpected downtime has significant operational consequences.
In these systems, even small differences in battery loading can gradually develop into reduced capacity, shorter service life and higher maintenance costs.
When one battery consistently experiences deeper discharge cycles, it becomes increasingly stressed. Eventually, the entire battery pack performs according to its weakest battery rather than its strongest. The result is premature battery replacement, reduced operating time and higher lifecycle costs.
Once one battery in the pair has aged faster than the other, simply replacing the weaker unit is rarely a long-term fix. The new and old batteries will quickly operate at different levels again, often forcing replacement of the full pair. By keeping the batteries balanced earlier in the lifecycle, an equalizer can help avoid this type of unnecessary cost.
A DC/DC equalizer continuously transfers energy between batteries to maintain balanced voltage levels, helping the battery system operate as a unified energy source rather than as individual batteries aging at different rates.
Designing for Reliability Rather Than Corrective Maintenance
As electrification expands across industrial vehicles and off-highway equipment, system architecture decisions increasingly influence machine availability over its entire lifecycle.A DC/DC converter ensures stable voltage for critical loads and protects sensitive electronics from disturbances within the power system. A DC/DC equalizer protects battery health by preventing long-term imbalance and uneven aging.
Both technologies support the same overarching objective: improving system reliability while reducing avoidable maintenance events.
For OEMs designing modern battery-powered equipment, the question is therefore not which technology is better. The more relevant question is which challenge needs to be addressed within the overall electrical architecture and where each technology delivers the greatest value.
Micropower's portfolio includes both DC/DC converters and DC/DC equalizers developed for demanding mobile applications, ranging from construction equipment and utility vehicles to rescue, safety and defense systems where long-term electrical reliability is a design priority.
