Modular Electrical Power System 2
ISISPACE Group
Second-generation modular EPS for 3U+ CubeSats, with distributed architecture, 45 Wh per battery pack, and 12 configurable output channels.
Typed specifications122 values
Discloses 12 of 14 fields engineers filter by in this category (category median 7).
- Mass
- 57.4 g incl. bottom mount full CSKB · datasheet p.7 51.6 g incl. top mount full CSKB | 57.4 g PDU incl. bottom mount full CSKB | 51.6 g PDU incl. top mount full CSKB | 252 g Power Battery Pack PBP-4S1P +2
- Total output power
- 48 W max · PBU max output power per battery channel/pack at 12V · datasheet p.9 64 W max · PBU max output power per battery channel/pack at 16V
- Envelope (L×W×H)
- 11 mm Height · datasheet p.7 height 21 mm Power Battery Pack (PBP-4S1P) | height 10 mm Power Battery Unit (PBU) | height 12 mm Power Conditioning Unit (PCU) | height 11 mm Power Distribution Unit (PDU)
- Outputs (as printed)
- VD0: fixed (= rail voltage) datasheet p.7 VD0: fixed (= rail voltage); VD1: user selectable (only below rail voltage); VD2: user selectable (only below rail voltage) VD1 and VD2 default configuration is 5V and 3V3 | VD1: user selectable (only below rail voltage) | VD2: user selectable (only below rail voltage) | VDx: x 4 (Option using DaughterBoard mounted regulator)
- Supply voltage
- 14.4 V nom. · battery pack nominal voltage · datasheet p.8 12.8–16 V Supply/bus voltage (Rail Voltage)
- Power consumption
- 0.066 W Idle consumption (regulation of VD1 at 5V and VD2 at 3.3V, no… · datasheet p.7 0.063 W PBU idle consumption (3.9mA @ 16V) | 0.066 W PCU idle consumption, MCU (3.9 mA @ 16 V) | 0.331 W PCU idle consumption, MPPT circuitry (33.1mA @ 10V) | 0.066 W PDU idle consumption (4.1mA @ 16V), VD1 at 5V and VD2 at 3.3V…
- Data interface
- I2C datasheet p.8 SPI optional | I2C two independent interfaces; isolated I2C bus segment per unit | UART | SPI optional
- Operating temperature
- -40–70 °C datasheet p.7
- Design lifetime
- 12 years datasheet p.7
- Unit type
- integrated EPS with battery modular stack: Power Conditioning Unit, Power Battery Unit, P… · datasheet p.4
- Board format
- PC/104 datasheet p.2
- Bus and outputs type
- hybrid (regulated rails + battery bus) VD0 fixed = rail voltage (battery 12.8-16.0 V), VD1/VD2 regul… · datasheet p.7
- Unregulated (battery) bus voltage
- 12.8 V min · datasheet p.7 16 V max | 12.8–16 V common power rail voltage (Vbat)
- Regulated output voltages
- 12.8 V Common Power Rail · datasheet p.7 16 V PCU output voltage (other voltages upon request) | 12.8 V VD0 | 5 V VD1 default configuration | 3.3 V VD1 or VD2 default +9
- Switchable outputs
- 4 VD0 switchable output channels per PDU (Vbat 12.8-16.0 V) · datasheet p.7 4 VD0 voltage domain | 4 VD1 switchable output channels per PDU | 4 VD1 voltage domain | 4 VD2 switchable output channels per PDU +2
- Solar array inputs
- 4 MPPT channels per Power Conditioning Unit board · datasheet p.10
- Solar input voltage window
- 2–13 V PV input min/max voltage (with battery voltage >14V) · datasheet p.10
- Max solar input power
- 39 W max · per PCU channel (5 series, 6 parallel solar cell strings) · datasheet p.10
- Solar array regulation
- MPPT harvesting mechanism: Maximum Power Point Tracking · datasheet p.9
- Integrated battery energy
- 90 Wh available configuration (45Wh, 90Wh, 135Wh and more) · datasheet p.2 45 Wh per Power Battery Pack PBP-4S1P (4 cells) | 135 Wh available configuration (45Wh, 90Wh, 135Wh and more)
- Protections
- Overcurrent/thermal limit on Unit input datasheet p.8 watchdog hardware supervisor including watchdog; TT&C watchdog | over-current (LCL) overcurrent/thermal limit on unit input and on each output bu… | over-temperature overcurrent/thermal protection | over-voltage overvoltage protection on all domains; TVS diodes +13
- Connector
- Harness interconnect: multicore wire, Harwin M80 L-Tek datasheet p.7
- Survival temperature
- -40–85 °C datasheet p.7 -40–85 °C storage temperature
- Flight heritage
- Design based on heritage from ICEPS1 design flown on PEASSS CubeSat (2016). IMEPS1, first generation, flown in 2018. IMEPS2 first flown in 2020. datasheet p.3
- Satellite class
- CubeSat CubeSat missions from 3U upwards · datasheet p.1 nanosat 1-10 kg targeting larger nano- and micro-satellites from 3U upwards | microsat 10-100 kg targeting larger nano- and micro-satellites from 3U upwards
- Missions flown
- 1 IMEPS1, first generation, flown in 2018. IMEPS2 first flown i… · datasheet p.3
- Quasi-static load
- 10.8 g design qualification load static, three axes · datasheet p.3
- Max current per output
- 12 A Common Power Rail · datasheet p.7 4 A Max total continuous for VD1 | 4 A Max total continuous for VD2 | 4 A Max total for VD1, continuous | 6 A Max total for VD1, peak +14
- Battery voltage range accepted
- 10–16.8 V battery pack min / abs max voltage · datasheet p.8 12.8–16 V battery pack operating voltage (PBP-4S1P)
- Max battery charge current
- 1.6 A max · battery pack max input current · datasheet p.9
- MPPT
- yes hardware-based maximum power point tracking · datasheet p.2
- Max solar input current
- 3 A max · maximum input current per PCU channel · datasheet p.10
- Integrated battery cell configuration
- 4 series (PBP-4S1P), Lithium-Ion, cell 3.6 V nominal, 3200 mAh datasheet p.8
- Battery heater control
- yes battery heating per pack, closed loop controlled, in orbit co… · datasheet p.9
- Housekeeping telemetry
- MCU/PCB temperature; voltage, current and power on total unit input, total output per voltage domain and each output bus channel; per cell voltage; 2 x temperature sensors per pack datasheet p.8
- Redundancy
- other multiple PDUs / PCUs / PBUs can be placed in parallel for red… · datasheet p.2
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 supplier17 lines, in the manufacturer's own wording
- Mass — pcu
- 58 g
- Mass — pbp
- 252.0 g
- Mass — pbu
- 48.7 g
- Mass — pdu
- 58 g (incl. Full CSKB)
- Volume — pbp
- 90 x 96 x 21 mm
- Volume — pcu
- 90 x 96 x 12 mm
- Volume — pbu
- 90 x 96 x 10 mm
- Volume — pdu
- 90 x 96 x 14 mm
- Operating temperature range
- -20°C to +70°C
- Data interfaces
- I2C, UART, SPI optional
- Mppt channels (per PCU)
- 4x independent channels
- Max input current (per MPPT channel)
- 3 A
- Max input power (per MPPT channel)
- 39 W
- Battery storage capacity (per PBP)
- 45 Wh (4 lithium-ion cells)
- Battery voltage range
- 8 V – 16.0 V
- Output channels (PDU)
- 12 configurable channels
- Pbu output power
- Max 64 W at 16 V
About
The ISISPACE Modular Electrical Power System 2 (IMEPS2) is a second-generation Electrical Power Subsystem for small satellites. Built on a modular, distributed design, it enables unmatched adaptability, tailoring power solutions to any platform’s exact needs without full customization. With cutting-edge GaN-FET technology, IMEPS2 ensures superior efficiency, reduced EMI, and scalable redundancy.
The system consists of up to four modules: Power Conditioning Unit (PCU) with 4x MPPT channels (max 3A each, 39W per channel), Power Battery Pack (PBP) with 45 Wh lithium-ion storage at 8–16V, Power Battery Unit (PBU) for battery heating and balancing, and Power Distribution Unit (PDU) with 12 configurable output channels.
Battery packs are stackable for additional storage and redundancy. The system communicates via I2C, UART, and optional SPI interfaces. IMEPS2 is compatible with 3U+ platforms and can be configured for missions requiring from tens to hundreds of watts of power.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.