Solar ATAP ROI Breakeven Calculator

By Dr K H Tang

Fixed benchmark lines are shown together with your custom monthly consumption line. Enter your desired ROI target in years to recalculate the maximum breakeven installed price in RM/kWp. The quoted RM/kWp is shown as a horizontal reference line; the red shaded region means the selected ROI target cannot be achieved for the custom load.

Custom monthly consumption, kWh

Custom ROI target, years

Example: 5 means recover system cost in 5 years.

Quoted price, RM/kWp

Shown as a horizontal reference line.

Daytime usage ratio, %

Example: 20 means 20% day, 80% night.

Ideal no-export size -

Computed solar yield -

Solar yield preset

Average full-sun hours/day

Also called peak sun hours.

Performance after losses, %

Panel heat, inverter loss, cable loss, dust, mismatch.

Days per month

Yield formula -

Monthly solar yield per kWp = average full-sun hours/day x days/month x performance after losses. Breakeven installed price = ROI months x monthly savings / system capacity.

Enter a quoted RM/kWp to compare against the custom breakeven line.

System size	Custom breakeven price	Breakeven total system price	Quoted total system price	ROI status vs quote	Monthly solar generation	Estimated monthly saving

Assumptions: no battery, no fixed extra cost, no export credit carried forward. Self-consumed solar offsets Energy + Capacity + Network charge. Exported solar receives Energy Charge only. Tariff switch used here: <=1,500 kWh/month uses RM0.4443/kWh self-consumption and RM0.2703/kWh export; >1,500 kWh/month uses RM0.5443/kWh self-consumption and RM0.3703/kWh export.