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Estimate annual savings and payback period from system cost, generation, self-consumption, electricity rate and feed-in tariff.
Annual savings
$1,458
Payback period
5.5yrs
10-year net
$6,580
25-year net
$28,450
Net position over 25 years
Annual savings blend the value of the energy you use yourself against the energy you export: savings = generation × (self-use% × rate + export% × feed-in tariff). Self-consumed energy is worth your retail rate; exported energy is worth the lower feed-in tariff.
system cost ÷ annual savings.savings × years − cost — a simple cumulative position before degradation, bill inflation and maintenance.Estimates only — for guidance, not a quote or engineering specification. Nothing you enter is stored or sent anywhere; the maths runs entirely in your browser.
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