Solar design guides
Short, practical guides to the calculations you need when you first look at a solar plant or rooftop system.
- Free solar PV design software comparedPVsyst alternatives side by side: what PVWatts, SAM, PVGIS and others can and cannot do
- Solar revenue and payback calculatorEnter system size, cost and power price to get yearly savings and payback years
- Solar DC/AC ratio calculatorCheck your inverter loading ratio and find how many modules fit one inverter
- Solar row spacing calculatorEnter latitude, table length and tilt to get the row gap and pitch
- Solar energy yield calculatorEnter system size to get annual and monthly kWh and a 20-year total
- How much land does solar need per kWEstimate capacity from land area, or land from capacity
- Solar output by roof directionHow much less north, east and west roofs make than south
- How to calculate solar PV energy yieldEstimate kWh per year from system size with one formula
- Solar panel row spacing calculationSet the row pitch so front rows don't shade back rows in winter
- Free solar shading analysisSee how rows, trees and terrain cut your energy yield
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