Peak Sun Hours
Peak Sun Hours expresses the equivalent full-sun hours available for daily energy production.
Solar Energy Calculator
Online preliminary estimate for PV capacity, panel count, inverter size, and off-grid battery.
All Calculators- Daily Energy
- 20.0 kWh/day
- Required PV Capacity
- 5.0 kW
- Panel Count
- 10 pcs
- Installed PV Capacity
- 5.5 kW
- Estimated Inverter Capacity
- 6.6 kW
- Battery Energy
- 27.8 kWh
- Battery Capacity Ah
- 578.7 Ah
This tool is only for preliminary estimation. Final design depends on location, irradiation data, orientation, shading, temperature, inverter specifications, battery chemistry, and local design rules.
System Loss
System loss covers practical losses from wiring, inverter, temperature, dust, mismatch, and operation.
On-grid and Off-grid
On-grid systems focus on PV and inverter sizing; off-grid systems also require battery backup estimation.
Battery DoD
Depth of Discharge defines how much of nominal battery energy is intended to be usable.
Simple example
For 20 kWh/day, 5 peak sun hours and 20% system loss, the tool estimates about 5.0 kW PV capacity before rounding to panel count.
Use and limitation
Use this estimate for early PV, inverter and battery sizing. Final design requires local irradiation data, shading review, orientation and equipment specifications.
Common questions
What does the solar calculator estimate?
Preliminary PV capacity, panel count, inverter size and off-grid battery energy from daily or monthly consumption.
What is Peak Sun Hours?
It is the equivalent full-sun hours used for daily energy production estimates at the project location.
Does this replace a full solar design?
No. Final design needs local irradiation, shading, orientation, temperature and equipment data.