Calculate the return on investment of a home solar system over its lifetime.
Lifetime ROI over 25 years
320.0%
about 12.8% a year · pays back in 6.0 years
Lifetime ROI over 25 years: 320.0%
RM25k system, RM350/mo savings, 25y
RM105k lifetime savings; pays back in about 6 years.
320% ROI
RM18k system, RM280/mo savings
Smaller systems often pay back even faster.
≈ 367% ROI
How the figures above are worked out — the rules, rates and reasoning behind every line.
Beyond payback, ROI tells you the total return on the money you put in. This compares your system cost against the bill savings over the panels' lifetime.
Lifetime savings = monthly bill savings × 12 × system lifespan. Net profit subtracts the system cost, and ROI expresses that as a percentage of what you paid.
Most panels carry a 25-year performance warranty. Savings depend on your usage, the system size and Malaysia's NEM (net energy metering) scheme.
With NEM offsetting your bill, residential systems often pay back in 5–8 years and then generate savings for the rest of a 25-year life, a strong lifetime ROI.
Net Energy Metering lets you export excess solar energy to TNB and offset it against your bill on a one-to-one basis, improving your savings.
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