1. The primer that budgets its own power

Neal Stephenson’s The Diamond Age returns as the recalled work because the Young Lady’s Illustrated Primer is a self-contained device that must manage its own energy across changing contexts and tasks. The desktop is the same: a distributed platform that must generate, store, convert, and ration its own power without a human walking over to flip a breaker.

This entry applies the power literature to the desktop.

2. The desktop’s power-relevant features

The desktop has several characteristics that shape its energy strategy:

  • High peak power: the objective is a “computer that consumes more than 500 W,” which is large for a small satellite.
  • Modular growth: cells and attachments are added over time, so power demand is not fixed at launch.
  • Variable customer loads: payload operations may create short, intense power demands.
  • Long life: the platform is meant to persist, so array degradation and battery cycle life matter.
  • Autonomous operation: ground cannot always be present during eclipse or fault events.

These features push the desktop toward a scalable, mode-based power architecture.

3. Derived requirements

The power literature gives the desktop six practical requirements:

  • Solar-battery baseline: primary generation from solar arrays, energy storage in lithium-ion batteries sized for eclipse and cycle life.
  • Mode-based power budgeting: operating modes with distinct load profiles, not a single worst-case number.
  • End-of-life sizing: arrays and batteries sized for degraded performance at end of life, not beginning of life.
  • Scalable distribution: bus voltage and distribution capacity chosen to accommodate future cells and payloads.
  • Fault-isolated channels: latching current limiters or electronic breakers so that a fault in one cell does not collapse the platform bus.
  • Protected power electronics: DC-DC converters and switches chosen or protected against total dose and single-event burnout.

4. Beyond the baseline

A NASA NTRS paper on kilowatt-class fission power systems describes nuclear options that fill the gap between radioisotope generators and large reactors. For the desktop, solar-battery is the near-term answer, but high-power phases, deep-space variants, or long-eclipse orbits may eventually justify nuclear or hybrid power.

5. Interaction with earlier arcs

The power arc connects directly to:

  • the radiation arc: power electronics are particularly sensitive to SEB and TID;
  • the thermal arc: waste heat from power conversion must be rejected;
  • the autonomous radiation mitigation arc: power budgeting interacts with throttling and safe mode;
  • the software fault injection and SEU recovery arcs: power faults must be recovered like any other fault.

6. What this changes

  • The desktop inherits explicit power and energy management requirements.
  • The strategy is solar-battery baseline with scalable distribution and radiation-aware power electronics.
  • The next entry will close the power reading arc and record the decision.