Solar Charge Controller Sizing (PWM/MPPT) implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-162

Effect

Computation or source lookup only

Input and validation requirements

An extreme but numerically valid Isc input produces Infinity in JavaScript arithmetic, and a negative signed Isc can produce an invalid negative required rating unless the instrument explicitly applies a magnitude convention. Exact voltage equality also correctly fails because the specified comparison is strict.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "array_Isc_A": 10.8,
    "cold_corrected_string_Voc_V": 41.2,
    "controller_max_input_voltage_V": 60
  },
  "expected_outputs": {
    "required_controller_current_A": 13.5,
    "maximum_voltage_check": "PASS"
  },
  "working": "Required current = Isc × 1.25 = 10.8 A × 1.25 = 10.8 A + (10.8 A × 0.25) = 10.8 A + 2.7 A = 13.5 A. Voltage check: 41.2 V < 60 V, so PASS."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json