Size a complete solar lighting system — panel wattage, battery capacity, and charge controller. Enter your location, LED load, and nightly operating hours to get a full off-grid system specification sized for your worst winter month.
Location – peak sun hours
UK / N. Europe
2.5 PSH avg
C. Europe / Canada
3.5 PSH avg
USA / S. Europe
4.5 PSH avg
Australia / S. Africa
5.5 PSH avg
Middle East / N. Africa
6.5 PSH avg
Custom
Enter below
Use worst month (December in northern hemisphere)
Latitude + 15 deg optimises for winter
Panel temperature affects output
LED lighting load
e.g. midnight dimming at 50%
System parameters
Typical: 0.35-0.45%/C for crystalline Si
Please enter LED wattage and hours of operation.
Minimum solar panel size
0 Wp
0Wh
Daily energy need
0Ah
Battery capacity
0A
Charge controller
0Wh
Daily generation
Complete system specification
Daily energy balance
Seasonal performance – days of autonomy by month
SeasonSolar yieldPSHSurplus
Battery sizing for different autonomy targets
AutonomyBattery AhBattery WhWeight est.
Solar lighting design tips
Daily energy consumption
Panel required
Battery required
Charge controller
System losses
Worst month PSH
Estimated payback vs grid
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