01 · Load & daily energy
Peak kW = Σ(watts × quantity) ÷ 1,000 for loads with usage above zero. Daily kWh = Σ(watts × quantity × daily hours) ÷ 1,000.
All active loads are assumed simultaneous. No diversity factor is applied.
SOLAR + STORAGE PLANNER
Good energy starts
with a clear plan.
What would it take to power your home or business?
Add your appliances. Get a useful first estimate.
01 List your appliances02 Set your backup needs03 Review your estimatePreliminary estimates, explained.
01 / YOUR APPLIANCES
What do you want to power?
Use the rated watts on each appliance. Choose which loads need battery backup.
Start with one appliance
Choose an appliance below, or load an example above.
Example wattages are placeholders. For fridges and ACs, use equivalent full-power hours to allow for cycling. Zero daily hours excludes a load.
02 / YOUR ENERGY NEEDS
Make the plan yours.
Selected loads, without solar or grid. Set 0 for a solar-only estimate.
Full-sun equivalent, not daylight hours. 4.5 is illustrative; local seasonal data must be checked.
Wp / panel
For an indicative panel count.Saved on this device•No contact details needed to calculate
THE THINKING BEHIND THE NUMBERS
Clear assumptions. Better decisions.
This tool uses a simple daily energy model. It does not simulate hourly weather or guarantee backup duration.
See calculations & assumptions
02 · Inverter
Minimum continuous kW = peak kW × 1.25. The planning capacity rounds up to the next 0.5 kW. Minimum kVA = unrounded minimum kW ÷ 0.8 assumed power factor.
Both real and apparent power ratings, ambient derating and motor surge must be checked.
03 · Battery
Backup energy = Σ(selected load kW × the smaller of daily hours and backup hours). All selected usage is assumed to fall within the outage until its daily hours are reached.
Nominal battery kWh = backup energy × 1.10 ÷ (0.80 × 0.92 × 0.95). This allows 80% depth of discharge, 92% inverter efficiency, 95% battery discharge efficiency and 10% reserve. Storage is rounded up to 0.1 kWh.
04 · Solar panels
PV kWp = [daily kWh + backup kWh × (1 ÷ (0.95 × 0.95) − 1)] ÷ (peak sun hours × 0.75). Panel count rounds up; array size = count × panel Wp ÷ 1,000.
The 75% PV-to-AC delivery factor includes solar and conversion losses. Extra battery cycling losses use 95% charge and 95% discharge efficiency. Backup energy is part of daily use, counted once.
What this means in practice
Lithium battery planning assumptions are illustrative, not product specifications. The PV estimate aims to cover daily use and one selected backup cycle per day. It excludes extended cloudy-day autonomy and recovery of a fully depleted reserve in one day. Battery BMS power, charge limits, inverter standby energy, MPPT/string voltage and current, phases, protections, cable sizes, earthing, roof structure and local rules require a site design.
Solar losses vary. PVWatts explains separate loss categories ↗; this tool uses its own simplified factors and is not a PVWatts simulation.
LOCAL EXPERTISE. PRACTICAL SOLUTIONS.
Let’s turn your plan into reliable power.
Solar • Inverters • Lithium batteries • Electrical engineering