Power · W / kW
The rate of energy transfer at a moment. 1 kW = 1,000 W.
See this in contextEnergy · Wh / kWh
Power accumulated over time. For a constant load, Wh = W × hours; 1 kWh = 1,000 Wh.
See this in contextDuty assumption
The fraction of a period a load is assumed to run. It changes energy, not its full running rating.
See this in contextStarting versus running power
Starting requirements can exceed running power. Unknown starts cannot be filled in from daily energy or duty.
See this in contextNominal energy
A rated/advertised capacity basis; identify its conditions and energy boundary before using it.
See this in contextUsable energy
A documented usable window or an explicitly assumed share of nominal capacity. Do not apply that share twice.
See this in contextReserve
Energy intentionally held back from the chosen usable window in a scenario.
See this in contextAC / DC energy boundary
Battery-side DC and delivered AC are different points in the energy path; apply conversion losses only across boundaries still being modeled.
See this in contextDC nameplate · Wp / kWp
A module or array power rating at specified reference conditions, not a daily energy forecast.
See this in contextModule efficiency
The share of incident solar power converted into electrical power under the stated conditions. Area and temperature matter.
See this in contextSTC / NOCT
Different reference/test-condition sets on a module datasheet. Compare the exact model and condition definitions.
See this in contextPmax, Vmp/Imp, Voc/Isc
Power, maximum-power operating voltage/current, and open-circuit voltage/short-circuit current are different fields; units and conditions stay attached.
See this in contextBifacial contribution
A rear-side energy contribution whose value depends on light, geometry and module properties; no universal bonus is assumed here.
See this in contextPrice per watt
Comparable price divided by nameplate watts at an equivalent panel/package quantity; freight and other costs remain separate.
See this in contextEquivalent-sun hours
An energy-resource equivalence used in simple exercises. It is not the number of daylight clock hours or a guaranteed production schedule.
See this in contextSystem scope
The exact equipment combination, interfaces, installation conditions and approvals; one component claim does not establish a complete system.
See this in contextSources & learning scope
Source concepts reviewed 2026-11-07. Exercise values are explicitly illustrative. This path explains concepts and arithmetic; it is not an installation design or professional certification.
- EIA: measuring electricity
Power, energy, W/kW and Wh/kWh.
- Australian Government: battery technology
Capacity, usable energy, output and backup configuration only; Australian program and installation rules are not applied here.
- Australian Government: solar panels
Nameplate power versus actual generation; no Australian production averages or eligibility rules applied.
- National Laboratory of the Rockies: SAM module models
Reference ratings, module conditions and rear-irradiance inputs for bifacial modeling.