San Francisco-based Chariot Defense is scaling production of its Amphora modular battery system to address the power gap in tactical directed-energy weapons. By utilizing silicon carbide power electronics and high-voltage architectures, the startup enables mobile laser systems to deliver high-wattage bursts without the thermal inefficiencies and logistical signatures of traditional diesel generators.
The Physics of Moving Beyond Diesel at the Tactical Edge
Directed-energy weapons (DEW) represent a fundamental shift in kinetic warfare, yet their deployment remains hindered by 20th-century power architecture. According to Chariot Defense CEO Adam Warmoth, standard military power grids are designed for low-voltage, high-current delivery, which necessitates massive, inefficient cabling and heavy transformers to handle the surge requirements of a 10kW to megawatt-class laser.
Chariot’s solution relies on transitioning to a 400V architecture, a standard popularized by the Electric Vehicle (EV) industry. By increasing voltage, the system reduces the current required for power transfer, which simultaneously mitigates thermal loss and allows for significant weight reduction in cabling. The core of this transition is silicon carbide (SiC) power electronics. SiC transistors handle higher voltages and switching frequencies than traditional silicon-based insulated-gate bipolar transistors (IGBTs), allowing for a 10x reduction in the size of drive inverters—the components that convert battery DC to the AC power needed for high-load systems.
Hybridization as a Strategy for Infinite Magazine Depth
The “infinite magazine” concept in laser weaponry relies on the ability to sustain fire as long as power is available. However, a pure battery solution is energy-dense but limited by capacity, while a pure generator solution is inefficient at idle and creates a massive thermal signature. Chariot’s Amphora system acts as an intermediary, using batteries to buffer high-power pulses while allowing a smaller, fuel-efficient generator to provide the long-term energy replenishment.
This hybrid configuration allows military units to decouple power generation from pulse delivery. The battery stores 15,000 watt-hours, providing the immediate 30kW surge necessary for an intercept, while the generator runs at a consistent, optimized RPM to maintain the charge. This approach directly counters the “targetable signature” problem; the generator can be placed further from the front line or throttled down to a minimum output, while the battery handles the high-signature firing event.
Operational Efficiency Comparison
- Traditional Generator: High thermal/noise signature, inefficient at variable loads, requires significant maintenance due to moving parts.
- Amphora Hybrid System: Silent standby operation, 3x smaller footprint than equivalent 30kW generators, utilizes solid-state switching for reliability.
Scaling the Silicon Carbide Supply Chain
The expansion of Chariot Defense, backed by a $34 million Series A round led by Andreessen Horowitz, signals a broader pivot toward integrating commercial EV-grade hardware into defense-grade tactical networks. This shift is not merely about battery capacity, but about the control software required to manage microgrids in contested, off-grid environments where standard grid stability is non-existent.
Technical analysts note that the bottleneck for these systems often lies in the availability of high-performance components that meet military-grade ruggedization standards. “The transition from lab-bench lasers to field-ready systems is entirely dependent on power density,” says Dr. Elena Vance, a senior systems engineer specializing in pulse-power architectures. “If you cannot manage the thermal dissipation of a 50kW pulse on a moving platform, you don’t have a weapon; you have a stationary target.”
Interoperability and the Future of Distributed Compute
Beyond directed energy, the Amphora system is designed to provide “clean” power for sensitive electronic warfare (EW) jammers and edge-compute nodes. Modern battlefield sensors, such as those detailed in IEEE research on tactical microgrids, require stable voltage regulation that current tactical generators often fail to provide. By implementing digital control loops, Chariot aims to eliminate the brownouts and power spikes that threaten mission-critical hardware.
The company is currently testing integration with Aurelius Systems, having recently powered live drone shootdowns at the Camp Atterbury T-REX exercise. By utilizing modular, bolt-on power hardware, Chariot is positioning its platform to be the primary energy backbone for the next generation of autonomous systems. As the battlefield becomes increasingly “electronically defined,” the ability to provide consistent, high-density power at the point of consumption—rather than at the rear supply depot—is becoming the defining factor in tactical maneuverability.
The company is currently scaling production of its Amphora 24 and 400 models to meet existing contracts with US Army units and B2B defense partners. For the tactical edge, the goal is clear: provide the power density of an electric vehicle with the ruggedization required for high-intensity, contested environments.
