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Keg-1. Build log

What the sensors said.

Entries are written when something is measured, bought, or decided. A datasheet is a claim; a multimeter reading is evidence. The two never share a column.

Phase
0Pre-build
Measurements
0logged
Claims under test
10graded
Budget
$1,000$0 spent
As of
2026-10-26

  1. Mon Oct 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

    Phase 0 baseline

    Phase 0

    The pre-build design is on record. No parts unboxed, no measurements taken. This entry fixes the baseline every later entry is compared against.

    State

    • Preprint v1.0 posted to SSRN on October 19, 2026 (abstract 7631278). It documents the pre-build phase only.
    • Bill of materials prepared September 30, 2026. Two lines price-checked against live listings: the Pi 5 boards and the keg. Everything else is an estimate.
    • Spent to date: $0.
    • Measurements to date: 0.

    Withheld values

    Four parameters are lessons and will be recorded here only after the builder produces them:

    Lesson Method Value
    Main fuse rating I_wire ≥ I_fuse ≥ 1.25 × I_cont,max pending
    Branch fuse ratings B1–B5 same rule per branch pending
    INA226 shunt value I_max = 81.92 mV / R_shunt pending
    Load-test stop rule set before the three-node test pending

    What triggers the next entry

    The first part is unboxed. The first measurement is the open-circuit voltage of the 100 W panel, read on the multimeter, in the sun. Build begins after the move to Seguin, Texas.