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Solar panels cost, Sizing Solar Electric Systems
1. Check the homeowners last 12 months electricity accounts or estimate the average
annual energy usage in kwh
2. Reduce your kwh figure allowing for reductions due to changing to using more
energy efficient solar panels cost equipment and living a more energy conscious lifestyle
3. Allow for future additional loads increase to determine your design kwh
4. Consult an accredited solar panels cost power system designer. Your solar panels cost system designer will
size the array typically by first checking your kwh figure and correctly
allowing for the following
1. Inverter efficiency (typically 90%)–(kwh x 0.9)
2. Solar radiation data for your location, tilt, angle & direction to the sun
(typically 0.9 x kwh divided by typically 5 peak solar hours = required wattage)
3. Manufacturer’s solar panel tolerance (typically +/- 5%)( derate by 5%)
4. Effects of temperature and dirt (typically derate by 5%)
5. Ensure your inverter is adequately sized. Your solar panels cost designer will size the
inverter allowing for
1. The maximum energy output of the array
2. A potential future increase in the size of the array
3. Matching the module configuration to the inverter
4. Decide whether to provide one inverter or multiple inverters