Public evidence

electrical.battery.runtime_temp

Machine-checked verification for calculation version 1.2.1 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

generic_cold_derating default; custom_symmetric_linear advanced

Declared partition coverage: PASS · 6/6 declared partitions (watts, amps, generic-cold, custom-symmetric, clamped-regime, invalid-domain)
Versions: Calculation 1.2.1 · CVP protocol 1.0.0-proposed · Evidence 2026-09-11.xcal-meta-derived
Verification revision: 2026-09-11.xcal-meta-derived · 16/16 property · digest 742a9a7e3a3b

Verification

Legacy regression suite: 31/31 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (31/31 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.2.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-11.xcal-meta-derived. Calculation version 1.2.1. CVP 1.0.0-proposed. 4/4 golden · 8/8 CVP boundary · 5/5 invalid · 16/16 property · 3/3 metamorphic · 2/2 cross-interface · 2/2 cross-calculator · 4/4 CVP contract. digest 742a9a7e3a3b.

Golden (oracle-backed) 4 / 4
CVP boundary 8 / 8
Invalid input 5 / 5
Property 16 / 16
Metamorphic 3 / 3
Cross-interface 2 / 2
Cross-calculator 2 / 2
CVP contract 4 / 4
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:07a2cd571bc7cee190b40451e118cf16ebd66763314e9b2be71bd89b98c5a2de

Input schema sha256:1f6dc4f1560deb6a6dc6773554e9402f11937cad9a9add1b3ce3bd2b81e77624 · Output schema sha256:b86641f8a4c60c84fe3c975df10a72394fe8a16220513508156a50fede69cae6 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: battery-runtime-temp
Engine: battery-runtime-temp
Engine build: 2026-09-10
Evidence core: 2026-09-05T02:35:39.217Z
Rendered: 2026-11-10T05:18:41.731Z
Last reviewed: 2026-08-12

Assumptions

Default: cold-only linear derating about 25 °C; T≥25 °C → f_T=1 (no high-temp bonus).
Clamp is a numerical safeguard, not an operating-temperature envelope.
Default k_T=0.006 is a planning default (parameter_validated=false).
Constant load; not Peukert / chemistry Arrhenius / manufacturer curve.
Amps mode I_A is battery-side; η does not enter t_h.

Limitations

Generic cold-derating planning model by default — not Peukert, Arrhenius, or manufacturer curves
Default k_T=0.006 is a planning default (parameter_validated=false), not a validated chemistry coefficient
Clamp is a numerical safeguard, not an operating-temperature envelope
T≥25 °C under generic_cold_derating does not increase capacity (no high-temp bonus)
custom_symmetric_linear is advanced opt-in and still a first-order heuristic
Amps mode = battery-side current; η does not enter runtime
capacity_Ah XOR capacity_mAh; both → INVALID_INPUT
k_T < 0 → VALUE_MUST_BE_NON_NEGATIVE
Intermediate layer toward chemistry/manufacturer profile runtime — not a Battery Simulator

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Victron Lithium Battery Smart — Operation (capacity vs temperature example) — Capacity vs temperature (product example)
Supports: Illustrative manufacturer evidence that capacity is rated at 25 °C and falls at low T (e.g. ~−20% at 0 °C, ~−50% at −20 °C under their conditions). Motivates a generic first-order cold planning derating — not a universal k_T calibration. CalculatorX default 0 °C ≈ −15% is first-order planning only.
Victron SmartShunt — temperature capacity compensation note — Temperature compensation engineering simplification
Supports: Example of an engineering practice that applies capacity derating below ~20 °C and treats warmer temperatures as lower impact — aligns with CalculatorX default cold-only (no high-temp bonus) planning stance.
Trojan Battery — temperature effects FAQ — Temperature and capacity / life
Supports: High temperature can increase available capacity for some lead-acid chemistries while harming life — reason not to default-reward high T in a generic planning tool.
CalculatorX Battery Runtime capability — Constant-load watts/amps model (1.2+)
Supports: Base runtime model (BatteryRuntimeBaseInput) extended by temperature factor

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.