A new generation of advanced electronics is being fitted to military vehicles, yet program managers are discovering a critical point of failure in an area long taken for granted: the power architecture. An advanced sensor suite may pass every laboratory test, only to suffer intermittent shutdowns in the field. The cause is often not the multi-million-dollar technology itself, but the vehicle’s inability to supply stable, sufficient power under the stress of a mission.
This disconnect between payload ambition and power reality is emerging as a primary factor driving schedule delays and budget overruns in defense modernization programs. It also places personnel at risk as well.
“The core issue is a fundamental shift in demand,” says APS armored & security program manager Vince Kresho. “The power draw from modern warfare systems far exceeds the baseline for which many legacy platforms were originally designed.”
Kresho, who himself has active-duty military experience on the front lines, understands the dilemma facing program managers; they must integrate cutting-edge capabilities to ensure warfighter overmatch yet do so on existing vehicle platforms governed by strict budgetary and physical Size, Weight and Power (SWaP) constraints. Planning the electrical architecture early helps the program account for those competing requirements before integration is underway.
“Understandably, a program manager is looking to minimize cost for a multi-year, multi-million-dollar upgrade, but they still need to be strategic in their planning for the long term. An unforeseen power system failure late in the development cycle can be catastrophic, leading to costly redesigns that derail schedules and deployment in the field,” he explains.
For the systems integrators responsible for the technical execution of these upgrades, an inadequate power foundation manifests in several distinct and challenging ways:
“The friction point lies in the acquisition lifecycle. Power systems are often specified early in a program based on initial estimates. However, as new electronic subsystems are added or upgraded over the program’s life, the cumulative power demand frequently outstrips the capacity of the original architecture,” says Kresho. “This creates a cascade of operational risks.”
For example, says Kresho, insufficient power can lead to diminished performance of critical systems. A signals intelligence receiver might not achieve its full range or a communications jammer its full output, directly impacting the operational effectiveness of the warfighter in the field.
“We see a pattern where the power system is the last component considered and the first to fail under integrated stress testing,” noted APS Director of Engineering Greg Yerington. “The electrical load from multiple new components running concurrently creates a demand profile that legacy alternators and wiring simply cannot handle reliably.”
As vehicle electronics evolve, the ability to generate, store and distribute power becomes an increasingly important part of platform planning. APS recommends treating the vehicle power system as a primary strategic consideration rather than a secondary line item. This approach involves calculating the total potential power budget for not only current systems but also for anticipated technologies over the next five to seven years.
“A ‘power-first’ mindset fundamentally changes the procurement and integration process. It ensures the foundational architecture is robust enough to support iterative modernization,” emphasizes Kresho. “The modernization programs that succeed will be those that treat the power system not as a cost to be minimized, but as the essential strategic enabler that it has become.”
APS develops power solutions for armored and security vehicle applications. Planning a military or armored vehicle upgrade? Talk with APS about load requirements, platform constraints and options for power generation, conversion and integration.
Modern military vehicles are being equipped with more advanced electronics, including sensors, communications equipment, computing systems and mission-specific payloads. Many legacy platforms were not originally designed to support that level of electrical demand, which can lead to instability, downtime or redesign late in the integration process.
Insufficient power can cause voltage sags, processor resets, data corruption, reduced subsystem performance and intermittent shutdowns. In mission-critical environments, those failures can affect communications, sensing, electronic warfare capabilities and overall operational readiness.
Power systems are often specified early based on initial requirements, but electrical demand can grow as new subsystems are added. Planning for current and future loads upfront helps reduce the risk of late-stage redesign, schedule delays and added program costs.
Size, weight and power constraints limit how much space and capacity are available for added components, cabling, batteries, alternators and thermal management. A successful upgrade must increase electrical capability without creating unnecessary weight, packaging or heat-management problems.
Integrators should evaluate voltage stability, peak and continuous load requirements, thermal behavior, EMI risk, wiring capacity and future power headroom. These factors help determine whether the existing vehicle architecture can reliably support new mission equipment under real operating conditions.
APS develops power upgrade solutions for government, defense, armored and security vehicle applications. By evaluating the full vehicle power profile and planning for future demand, APS helps program managers and integrators build a more reliable foundation for advanced onboard systems.
