Solar Daily Load Calculator
IEEE 1562 & ASHRAE APPLIANCE REFERENCEItemize your household appliance electrical loads into daily watt-hours and kilowatt-hours (Wh & kWh/day), plus total connected instantaneous wattage.
How solar load calculation works
Every solar sizing calculation begins here: daily energy (watt-hours per day) and connected load (total instantaneous power).
Formulas
The daily energy math
Deterministic energy integration from appliance duty cycles.
Wh/day = power (W) × quantity × hours/day
Energy used by an individual appliance line item over a 24-hour cycle.
P_connected = Σ (power (W) × quantity)
Peak continuous power if all appliances are active simultaneously.
Frequently asked questions
How do I calculate my daily solar energy consumption?
For each appliance, multiply its power in watts by how many units you have and by the hours it runs per day: energy (Wh) = power × quantity × hours. Sum all loads for the total daily Wh, then divide by 1000 for kWh/day.
What is the difference between connected load and daily energy?
Connected load is the instantaneous power in watts if every appliance is switched on at the same time — it is a power figure that guides inverter and surge sizing. Daily energy is the energy in watt-hours or kilowatt-hours consumed over a day — it guides battery and solar sizing.
Related Calculators
Continue your system design with the other tools in the SolarCalcKit suite — in the order the rest of your design flows: load audit → battery → bank wiring → MPPT → wire size → inverter.
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Size a battery bank from that daily energy, autonomy days, chemistry and depth of discharge.
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Turn a target kWh or Ah into an exact series–parallel battery configuration.
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Size the charge controller from PV array wattage and the battery system voltage.
Open ToolSolar Wire Size / Drop
Size DC conductors from current, run length and allowable voltage drop.
Open ToolInverter Sizing
Size an inverter from continuous and surge loads, with DC battery current.
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