1. Don’t panic, but know where the electrons are

Douglas Adams’ The Hitchhiker’s Guide to the Galaxy returns because dynamic power trading needs the same thing a good towel provides: simple, reliable infrastructure. Before cells can trade power, they must know how much they have, how much they need, and whether the wires between them can carry the load.

This entry lists what the desktop would have to provide for dynamic power trading to work.

2. Electrical provisions

The hardware must support controlled power flow:

  • Per-cell power switching: the ability to connect or disconnect a cell from the main bus under software control.
  • Per-cell metering: voltage, current, and state-of-charge measurement for generation, storage, and load.
  • Current limiting: each path must have a hard limit to prevent one cell from collapsing the bus.
  • Isolating switches: a faulty cell must be disconnectable without interrupting the rest of the federation.
  • Common bus voltage: all cells must agree on a voltage band and tolerate transients during switching.

3. Information and policy

The cells must share data and obey rules:

  • State broadcast: each cell reports generation capacity, storage state, predicted load, and priority.
  • Trading protocol: a lightweight, deterministic way for cells to request, offer, and accept power.
  • Priority policy: ground-defined rules for which loads get power when supply is constrained.
  • Forecasting: estimates of future generation and load so that trades do not mortgage the next eclipse.

4. Safety and fallback

A power market cannot be allowed to crash the bus:

  • Hard limits: maximum current and minimum voltage thresholds that override any trade.
  • Emergency shedding: if the bus voltage drops, non-critical loads are shed automatically.
  • Graceful degradation: if negotiation fails, the system reverts to a safe default allocation.
  • Audit log: every trade and every switch action is recorded for ground review.

5. What this changes

  • Dynamic power trading requires hardware metering and switching, plus a policy layer.
  • Many of these provisions are worth making even for a static power bus.
  • The next entry will decide whether the desktop should design for this capability.