Turn a household appliance checklist into daily energy, inverter VA, battery Ah, solar kWp and panel count.
Appliance defaults are editable planning benchmarks. Refrigerator runtime is set below 24 hours to represent compressor cycling.
Selected battery chemistry uses 90% usable depth of discharge. Refrigerator and pump surge factors are planning assumptions. Confirm equipment surge, battery discharge limits, protection, cable sizing, roof design and solar resource with qualified installers.
Method: daily Wh = Σ(quantity × watts × hours); solar kWp = daily Wh ÷ 1,000 ÷ (peak sun hours × performance ratio)
Inputs used: 3512 Wh/day ÷ 1,000 ÷ (4.5 × 75%) = 1.0405925925925925 kWp
Assumptions: Motor surge factors for refrigerator and pump Selected usable battery depth of discharge Solar performance ratio
Scope and warnings: Planning calculation only. Confirm appliance duty cycle, starting surge, cable and protection design, roof layout, shade, local solar resource and equipment compatibility before purchase.
National Renewable Energy Laboratory · PVWatts supported locations; use a location-specific model for a site estimate · effective PVWatts version 5 documentation · reviewed 2026-09-12
high confidence · Engineering estimate
Supports the transparent solar energy relationship and system-loss planning reference.
Exclusions: Not a structural, electrical or financing assessment. ToolMitra does not query PVWatts automatically.
U.S. Department of Energy · United States government educational resource; technology concepts are broadly applicable · effective As published · reviewed 2026-09-12
high confidence · Engineering estimate
Supports the distinction between power, energy and storage-system limitations.
Exclusions: Not a product-sizing recommendation or outage-resilience guarantee.
The planner totals appliance running watts and daily watt-hours. Inverter VA applies the entered safety margin and power factor to a surge-aware peak load; battery Ah applies selected usable depth of discharge and efficiency; solar kWp divides daily energy by peak sun hours and performance ratio.
A home with lights, BLDC fans, refrigerator and TV can separate daily energy from surge-aware inverter capacity before choosing battery storage and solar panels.
No. Starting surge, cable sizing, protection, appliance duty cycles, roof layout, local solar resource and equipment compatibility require qualified electrical and solar design.
Calculations run on your device. Review your results before exporting or sharing them.
The checklist starts with common household appliances, but its defaults are only planning values. Enter measured watts and credible operating hours, especially for refrigeration, pumps and air conditioning.
The planner keeps daily energy, surge-aware inverter capacity, battery energy and solar capacity separate. A final system still requires compatible equipment, cable and protection design, roof assessment and local solar-resource information.
Published by ToolMitra — methods and editorial approach.