Field notes · transparent assumptions

Electricity-cost guides

Use stronger inputs, understand the formulas, and know when a planning estimate needs a real measurement.

Find your electricity rate

Identify the marginal per-kWh rate without confusing it with fixed charges.

Separate unit rates, time bands, tiers, taxes, and fixed charges.

Choose between measurement, technical documents, labels, and cautious estimates.

Turn scheduled time into realistic active runtime.

Collect representative kWh evidence safely.

Convert battery energy into energy drawn from the wall.

Test whether operating savings justify incremental purchase cost.

Prioritize changes that reduce compressor runtime or heat gain.