In more detail
A 5 kW system with 5 peak sun hours makes about 25 kWh a day before losses. Yearly output times your electricity price gives the savings used to calculate payback.
Glossary
Science & Engineering
Peak sun hours
Peak sun hours are the number of hours per day the sun delivers 1,000 watts per square metre, the unit used to size solar panels.
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Glossary
Kilowatt-hour (kWh)
A kilowatt-hour is the energy used by a 1,000-watt device running for one hour, the unit on electricity bills.