High-Power Electrical Power System Module (EPSM1)
Pumpkin, Inc.
Multi-channel space-grade EPS module with 6 MPPT solar inputs (max 480W total), dual Li-Ion battery ports, and configurable 3.3–28V output rails with >99% efficiency.
Typed specifications106 values
Discloses 9 of 14 fields engineers filter by in this category (category median 7).
- Mass
- 230 g nom. · aluminum standoffs, no heat spreader · datasheet p.7 300 g | 230 g Aluminum standoffs, no heat spreader | 300 g max
- Conversion efficiency
- 96 % datasheet p.1 97.5 % minimum efficiency over a wide range of operating currents | 97.5 % min · minimum efficiency of each block over a wide range of operati… | 98.5 % max · 96-98.5% efficient 250kHz GaNFET switching | 98.5 %
- Envelope (L×W×H)
- 96 mm x 90 mm x 15.24 mm nominal, without any additional heatsinks · datasheet p.7 96 (length) x 90 (width) x 15.24 (height) mm
- Outputs (as printed)
- 3 regulated outputs (3.3/5.0/12V, 5-8A) and 1 switchable regulated output (AUX, 4-28V, 8A); 32V internal power ring; AUX/VBATT on the 104-pin bus datasheet p.1 4-28V 1 switchable regulated output | 3.3/5.0/12V 3 regulated outputs
- Supply voltage
- 16.8 V nom. · battery block · datasheet p.1 8 V min · Solar array input, normal operating conditions | 28 V max · Solar array input, normal operating conditions | 16.8 V nom. · Li-Ion batteries
- Power consumption
- 2 W nom. · operating power consumption, deployment switches not inhibite… · datasheet p.9 3 W | 2 W Operating power consumption, Deployment switches not inhibite… | 2 W Operating power consumption, Deployment switches not inhibite… | 3 W max · SWaP: < 3W
- Data interface
- I2C datasheet p.4 UART debug terminal to the Supervisor MCU, 115200,N,8,1 | I2C SCPI over I2C via SupMCU, up to 400 kHz, default 7-bit addres… | I2C | I2C +1
- Operating temperature
- -40 °C min · datasheet p.7 85 °C max | -40–85 °C TOP, absolute maximum ratings
- Unit type
- EPS without battery intended for use with zero, one or two dedicated external bat… · datasheet p.3
- Board format
- 1U board 90x96 mm nominal 90x96 mm footprint, approximately one PC/104 module (… · datasheet p.5 CubeSat Kit bus CubeSat Kit-compatible footprint, 104-pin connector | 1U board 90x96 mm
- Bus and outputs type
- hybrid (regulated rails + battery bus) loads can draw power from regulated-voltage and unregulated-v… · datasheet p.5
- Unregulated (battery) bus voltage
- 32 V datasheet p.1
- Regulated output voltages
- 28 V nom. · AUX block, user-programmable, block output voltage 4.0 to 28 V · datasheet p.9 3.3 V regulated output block | 5 V regulated output block | 12 V regulated output block | 4 V +1
- Switchable outputs
- 1 1 switchable regulated output (AUX, 4-28V, 8A) with ON/OFF co… · datasheet p.1
- Solar array inputs
- 6 6 solar array inputs (8-28V, 2A/4A) · datasheet p.1
- Solar input voltage window
- 8–28 V input to MPPT-equipped block, SAI1-SAI6, normal operating con… · datasheet p.9 8–28 V
- Solar array regulation
- MPPT datasheet p.1
- Protections
- 2 programmable overtemperature (OT) limits datasheet p.1 over-temperature 2 programmable overtemperature (OT) limits | watchdog configurable watchdog timer (WDT) | latch-up (SEL) OFF_VCC input to latchup-prevention overcurrent switch; SEU-i… | inrush current limiting peak inrush current +1000 mA on solar array inputs, +15 A on … +5
- Connector
- 104-pin CubeSat Kit bus (H1 & H2); SAI 10-pin connectors J141-J144, mating Hirose DF13-10S-1.25C, 1A per pin; BAT 14-pin connectors J147 & J148, mating Harwin M80-4801442, 3A per pin datasheet p.11 dedicated, high-current connectorized harnesses Battery charger connections | 104-pin connector Regulated and unregulated outputs | discrete connectors Solar array inputs
- Random vibration
- 14 g RMS tested to NASA GEVS (14grms) levels · datasheet p.1
- Satellite class
- CubeSat CubeSats & nanosatellites, Pumpkin MISC 3 CubeSats · datasheet p.1 nanosat 1-10 kg CubeSats & nanosatellites, Pumpkin SUPERNOVA NanoSats | nanosat 1-10 kg
- Max current per output
- 8 A +12Vdc, AUX · datasheet p.4 5 A +3.3Vdc & +5Vdc | 8.4 A 12V block (max) | 8 A 12V regulated output | 5.25 A 3.3V block (max) +22
- Battery voltage range accepted
- 16.8 V 2 battery blocks, 16.8V 4S2P Li-Ion batteries only; absolute … · datasheet p.1 16.4 V charging | 0.3–16.8 V BAT V+
- Max battery charge current
- 1 A CC to CV, 4SNP, Li-Ion, CC to CV transition current · datasheet p.19 6 A CC to CV, 4SNP, Li-Ion, Initial CC current | 6 A CC to CV, 4SNP, Li-Ion, Max CC current | 8 A max · battery current, charging
- MPPT
- yes kHz-speed perturb-and-observe agile MPPT on each solar array … · datasheet p.1
- Max solar input current
- 2 A max · input to MPPT-equipped block, SAI1-SAI4 · datasheet p.9 4 A max · input to MPPT-equipped block, SAI5-SAI6
- Inhibit / RBF inputs
- 3 RBF (J145) and two separation switches (J149 Sep 1, J152 Sep 2) · datasheet p.10
- Housekeeping telemetry
- Fully formatted telemetry via SupMCU (SCPI over I2C): comprehensive voltage, current and temperature information on the blocks and overall system status; 8 LMx35-type temperature telemetry channels; radiation dosimeter datasheet p.1
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier16 lines, in the manufacturer's own wording
- Solar input channels
- 6
- Max total solar input
- 480 W
- Mppt frequency
- 250 kHz
- Max input per channel
- 4 A at 28 V
- Battery ports
- 2
- Battery voltage
- 16.8 V Li-Ion
- Max battery charge rate
- 6 A CC
- Max battery reserve per port
- 112 W
- Output rail 1
- 3.3 V / 5 A
- Output rail 2
- 5 V / 5 A
- Output rail 3
- 12 V / 8 A
- Output rail 4
- 28 V / 8 A
- Total output power
- ~300 W
- Efficiency
- >99%
- Temperature monitoring
- 3 internal + 8 external ports
- Control
- SEU-immune FPGA + SupMCU, SCPI over I2C
About
The Pumpkin EPSM1 is a high-power, multi-channel Electrical Power System Module designed for space applications. It accepts up to 6 solar array input channels with individual MPPT at 250 kHz, each rated for up to 4A at 28V maximum, supporting a total input of up to 480W. Two battery ports support 16.8V Li-Ion batteries with CC/CV charging up to 6A (112W reserve per battery).
Output rails are configurable: 3.3V/5A, 5V/5A, 12V/8A, and 28V/8A with approximately 300W total output. Power conversion efficiency exceeds 99%. Temperature is monitored on 3 internal and 8 external channels. The control logic uses an SEU-immune FPGA paired with a SupMCU co-processor, commanded via SCPI over I2C. The module integrates with the 104-pin CubeSat Kit bus.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.