Electrical reference chart
Solar ROI Payback Chart
Use this worksheet after the calculator result to record gross cost, user-entered incentives, annual production, self-consumption, export credit, O&M, replacement, simple payback, and cash-flow assumptions.
Quick reference table
A solar ROI payback chart is a calculator-led planning worksheet. It documents gross cost, user-entered incentives, production, self-consumption, export credit, O&M, replacement, and payback assumptions before finance, utility, or installer review.
Solar ROI payback worksheet
| Item | Record from calculator | Follow-up |
|---|---|---|
| System cost | Gross cost and net cost entered | Verify quote scope and exclusions |
| Production | Annual kWh, self-consumption, and exported kWh | Confirm site, production, and utility assumptions |
| Savings | Self-consumption, export credit, O&M, first-year net savings | Review utility tariff and usage pattern |
| Payback | Simple payback, replacement, and cash-flow notes | Run sensitivity before decision |
Solar finance review lanes
| Finance lane | Record on worksheet | Why it changes the decision |
|---|---|---|
| Export credit | Net metering, buyback, or self-consumption basis | The same kWh can have different bill value |
| Incentive status | Entered incentive, eligibility note, expiration | Unverified incentives can distort payback |
| Degradation and maintenance | Annual degradation, O&M, inverter replacement note | Long-term cash flow is not the same as first-year savings |
| Roof and ownership | Roof age, financing term, transfer or resale note | Payback can be limited by ownership and roof timing |
How to use this chart
Record cost basis
Write gross cost, user-entered incentives, net installed cost, quote scope, and exclusions.
Attach production and rate data
Document annual kWh, self-consumption share, retail rate, export credit, O&M, and scheduled replacement.
Route finance review
Use the worksheet to list sensitivity cases, financing notes, and reviewer follow-up.
Formula basis
Simple solar payback = net installed cost / first-year net savings.
- Net installed cost is gross installed cost minus incentive values entered by the user.
- First-year net savings is self-consumed value plus exported value minus O&M.
- Self-consumed value uses the entered retail electricity rate.
- Exported value uses the entered export credit and should not automatically equal the retail rate.
- Cash-flow assumptions include rate change, degradation, O&M, scheduled replacement, and finance inputs when used.
Worked examples
Residential solar payback record
Record gross cost, user-entered incentive values, annual kWh, self-consumption, export credit, first-year net savings, simple payback, O&M, replacement, and review owner.
Export-credit sensitivity record
Keep annual production, self-consumed kWh, exported kWh, export credit, incentive note, degradation, maintenance, and conservative payback in one finance review.
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Frequently asked questions
These answers explain how to use the chart without turning a quick reference into a final design decision.