Lighting
LED light
- Typical range
- 5–20 W
- Suggested
- 10 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Solar Load & Energy Consumption Calculator
Build an editable household or commercial load schedule, separate energy from peak power, and review critical backup demand before discussing equipment options.
Loading your local draft…
Optional project context
Country, voltage and frequency
Planning default only. Global / not specified is selected. Choose a country for a common starting profile, or enter the actual site values directly. New AC loads inherit these editable voltage values; appliance wattage and energy use are never changed.
No existing Voltage × current AC loads to updateChoose an input route
Build a load list without hiding assumptions
Show equipment presets for
Showing 15 of 15 home presets.
Cooling & ventilation
Ceiling fan
- Typical range
- 25–100 W
- Suggested
- 55 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Refrigeration
Refrigerator
- Typical range
- 60–400 W
- Suggested
- 150 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Electronics
Television
- Typical range
- 30–250 W
- Suggested
- 100 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
IT & communications
Internet router / ONT
- Typical range
- 5–40 W
- Suggested
- 15 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
IT & communications
Laptop computer
- Typical range
- 25–150 W
- Suggested
- 65 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
IT & communications
Desktop computer and display
- Typical range
- 80–600 W
- Suggested
- 200 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Kitchen
Microwave oven
- Typical range
- 700–1,800 W
- Suggested
- 1,200 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Kitchen
Electric kettle
- Typical range
- 1,000–2,200 W
- Suggested
- 1,500 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Appliances
Washing machine
- Typical range
- 300–1,200 W
- Suggested
- 500 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Motors & pumps
Water pump
- Typical range
- 250–2,200 W
- Suggested
- 750 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Cooling & ventilation
Room air conditioner
- Typical range
- 500–3,000 W
- Suggested
- 1,200 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Heating
Electric water heater
- Typical range
- 1,500–6,000 W
- Suggested
- 3,000 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
EV charging
AC EV charger
- Typical range
- 1,400–11,500 W
- Suggested
- 7,200 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Security
CCTV camera
- Typical range
- 3–20 W
- Suggested
- 8 W
Editable planning estimate. Replace it with nameplate or measured data when available.
Basis: Generic equipment planning range · Reviewed Aug 2026
Generic equipment planning range only. It is not tied to a country, manufacturer or model. Actual input can vary by size, efficiency, controls, operating state and voltage. Replace the suggested value with the equipment nameplate, datasheet or a measured value whenever possible.
What the tool covers
Use one load schedule across home, commercial and backup planning
The formulas stay consistent in both input modes. Guided presets help organize common appliances, while the professional route exposes the electrical fields needed for commercial and three-phase equipment.
Solar load calculation for homes and small businesses
Build an appliance load schedule for lighting, refrigeration, kitchen equipment, pumps, air conditioning, EV charging, POS, CCTV and other everyday loads. See daily energy consumption separately from the power that may run at one time.
Continue to residential backup planningCommercial electrical load calculator inputs
Enter office, retail and project equipment by W or kW, or calculate power from DC, single-phase or three-phase electrical data. Motors, HVAC and compressors can include an editable starting value.
Review commercial solar and storage planningOff-grid and battery-backup load planning
Separate critical loads, backup duration, normal simultaneous demand and the largest entered starting increment. The result describes load-side requirements only; it does not turn the estimate into a battery or inverter recommendation.
Plan a remote or off-grid project briefNeed to carry the result into product matching? Read how to turn a load schedule into a complete solar RFQ without treating an early estimate as final system design.
Calculation methodology
Energy is calculated from running power, quantity, hours, weekly schedule and duty cycle. A direct kWh input is treated as the combined total for its complete load row, then normalized to a weekly basis before daily, monthly and annual totals are derived.
Single-phase real power uses voltage × current × power factor. Three-phase real power uses √3 × line voltage × current × power factor. DC uses voltage × current.
Running peak includes only loads marked as simultaneous. Estimated starting peak adds the largest entered start increment rather than summing every motor start.
Backup energy uses full running power × quantity × backup duration × the separate backup duty cycle. Backup running and starting peaks continue to use full equipment power.
What this calculator does not size
It does not apply battery depth of discharge, conversion loss, reserve, temperature, aging, solar yield, DC/AC ratio, MPPT boundaries, conductor limits or local electrical rules.
The result is therefore not a PV array, battery, inverter, cable, breaker or protection recommendation. Those decisions require exact equipment data, project conditions and a defined engineering responsibility.
Contact our team for a detailed project reviewGlobal input assumptions
Start with a common supply profile, then confirm the actual site
Country selection provides a practical starting point for nominal voltage, phase and frequency. It does not certify local compliance or replace the project service drawing, utility information or equipment nameplate. Every electrical value remains editable, and the selected country never changes appliance wattage or operating hours.
Sources and assumptions
Appliance presets use generic equipment planning ranges maintained as editable references by Rongkai Solar. They are not copied from one country standard, manufacturer catalogue or model specification. Each preset shows its basis and review month; use a current nameplate, datasheet, meter or measured value whenever available.
195
country options
11
common supply profiles
100%
editable electrical inputs
Questions before you use the result
Solar load calculator FAQ
Does this calculator size a solar system, battery or inverter?
No. It organizes load-side energy, running power, estimated starting power and critical backup demand. Equipment sizing also requires system losses, manufacturer limits, site conditions, electrical design and project-specific review.
Should I use the suggested appliance wattage?
Use it only as a starting estimate. Replace it with the equipment nameplate, current datasheet or measured input whenever possible, especially for air conditioners, pumps, refrigeration and commercial equipment.
What is the difference between kW and kWh?
kW is power at a moment and affects simultaneous and starting demand. kWh is energy used over time and depends on power, operating hours, schedule and duty cycle.
How is the estimated starting peak calculated?
The calculator adds the largest entered starting-power increment to the selected simultaneous running load. It does not assume that every motor starts at the same moment.
What does backup energy mean here?
It is the load-side energy required by equipment marked as critical for the entered backup duration and editable backup duty cycle. Continuous and starting peaks still use full equipment power. The result does not include battery depth of discharge, inverter loss, temperature, aging, reserve or solar production.
Does quantity multiply a direct energy entry?
No. Direct energy is the combined total for the complete load row, including every unit represented by that row. Quantity is used only with the optional per-unit running power for peak and backup calculations.
Does selecting a country apply local electrical standards?
No. Country selection provides editable nominal voltage, phase and frequency starting values for load calculation. Utility service arrangements and project requirements can vary within a country, so the actual site data must still be confirmed.
Is my equipment list sent to Rongkai automatically?
No. The draft stays in your browser. A summary is passed to the inquiry page only when you choose Prepare an RFQ, and it is not submitted until you send the form.