Rooftop solar in Tonga typically costs about T$4,110 per kW installed, and household electricity is around T$0.36 per kWh. The average sunshine is about 5 peak sun hours a day.
As a rough example, a 5 kW home system would cost about T$23,640, make around 6,844 kWh a year, and save about T$2,464 a year. That is a payback of roughly 9.6 years.
Rooftop solar
For homes and businesses. Size, cost, savings and payback.
Open rooftop calculatorSolar plant
For larger projects. Project returns and break-even price.
Open plant calculatorThese are typical estimates, not quotes. Replace them with real quotes before you decide anything.