Off-grid planning tool

Tiny House Solar Calculator

Estimate daily energy use, battery capacity, solar panel wattage, and inverter size from basic appliance usage.

Appliances

Add the devices you expect to run in your tiny house.

Appliance	Watts	Hours/day	Qty	Daily Wh	Remove

Use whole numbers for quantity. Decimals round to the nearest whole number.

System settings

Use local solar conditions and your preferred backup assumptions.

Battery backup days How many cloudy days the batteries should cover. Peak sun hours A rough estimate of usable sunlight per day. Many locations use 4-5 as a starting point. System efficiency (%) Accounts for real-world losses from wiring, inverter use, heat, and charging. Battery depth of discharge (%) Usable share of the battery before recharge. Inverter safety margin (%) Extra room above estimated running watts.

Estimated results

Total daily energy 0 Wh 0 kWh per day

Estimated battery bank size 0 Wh 0 kWh estimated battery bank size

Recommended solar panel size 0 W Based on sun hours and system efficiency.

Rough inverter size 0 W Based on running watts plus safety margin. This does not include startup surge loads from fridges, pumps, microwaves, air conditioners, or power tools.

This calculator gives a rough planning estimate only. It is not a final electrical design. Consult a qualified electrician or solar professional before buying or installing equipment.