Key highlights

The EnduroSat CubeSat EPS is a modular electrical power system that scales from 6U to 16U CubeSat missions through configurable Li-Ion battery packs: a single 99 Wh 4S2P pack covers 6U-8U platforms, while a dual-pack build serves 12U and 16U buses. With 437 W maximum continuous power handling and 75 W of peak input per solar channel, it brings genuine power headroom to the nanosatellite class.

Energy harvesting and distribution are tightly engineered. Three input channels per input stage accept up to 45 V and 3 A each, with a blocking ideal diode on every solar panel connector. During sunlight the system bus is fed directly from the arrays (14.7-17.5 V); in eclipse it switches seamlessly to the battery (14.7-16.4 V). Downstream, the power distribution module offers 3.3 V, 5 V, 12 V and system bus rails, two regulated 28 V high-power buses, six dedicated payload power buses, and a 3.3 V VRTC channel that keeps the real-time clock alive — all switchable through 27 individually controlled enable lines.

Designed for a 5-year battery lifespan with integrated charge and discharge control, this CubeSat power system protects every output against overvoltage, undervoltage and overcurrent, and uses passive and active thermal management to preserve battery health. PC-104 and dedicated power connectors, dual 1 Mbps CAN interfaces with CSPES, plus deployment and Remove Before Flight switches make integration into standard CubeSat stacks straightforward.

Applications

Primary electrical power system for 6U, 8U, 12U and 16U CubeSat platforms
Multi-payload CubeSat missions needing six dedicated payload power buses
Power-hungry nanosatellite payloads using the 2x regulated 28 V high-power buses
Multi-year LEO missions requiring a 5-year battery design life
PC-104 stack architectures and EnduroSat platform integrations

Key features

Scalable battery configuration:
1x or 2x 4S2P Li-Ion packs at 99 Wh each, matching 6U-8U or 12U-16U missions.
High continuous power:
437 W maximum continuous power with 75 W peak input per channel.
Flexible solar input:
3 input channels per input stage, up to 45 V and 3 A per channel, each with a blocking ideal diode.
Seamless day/night bus:
System bus fed from solar panels (14.7-17.5 V) in sunlight and from battery (14.7-16.4 V) in eclipse.
Rich power distribution:
3.3 V, 5 V, 12 V and system bus main rails plus 2x regulated 28 V high-power buses.
Dedicated payload rails:
6x payload power buses, each configurable as 3.3 V, 5 V, 12 V or system bus.
Always-on RTC supply:
3.3 V VRTC channel keeps the real-time clock powered at all times.
Granular switching:
27 enable lines with individual control for fine-grained load management.
5-year design life:
Battery designed for 5 years with integrated charge and discharge control.
Full output protection:
Overvoltage, undervoltage and overcurrent protection on all outputs.
Thermal management:
Passive and active thermal control safeguards battery health and efficiency.
Standard integration:
PC-104 and dedicated power output connectors, 2x CAN at 1 Mbps with CSPES, deployment and RBF switches, plus an interface for powering, debugging and programming.

Flight heritage

The system has achieved flight heritage.

Testing & qualification

Compliant with the CubeSat standard.

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Last updated: 2026-06-04