FICTIONAL HOME · SAMPLE INPUTS
The property picture.
Original illustration. Not map or satellite imagery.ANNUAL ELECTRICITY USE12,000 kWh
SOLAR SCENARIO6 kW / 9,000 kWh a year
PROPERTY INFORMATIONRoof age & shade: verify
HOMEOWNER PRIORITYCompare bills + backup
What the actual report would establishYour property overview would use available, appropriately licensed imagery and supplied information. Roof suitability, structural condition, electrical capacity, and installation feasibility require qualified on-site verification.
FICTIONAL HOME · CASH-PURCHASE EXAMPLE
Show the math.
Illustrative annual comparison| Scenario | Solar only | Solar + battery |
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| Upfront cash cost | $18,000 | $30,000 |
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| Annual energy value* | $1,575 | $2,103 |
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| Simple payback* | 11.4 years | 14.3 years |
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*Illustrative energy value only, not a complete bill calculation. Simple payback = upfront cost ÷ annual energy value. Excludes fixed charges, financing, incentives, degradation, maintenance, replacement, and future rate changes. Actual analysis requires utility-specific timing and rates.
FICTIONAL HOME · SAMPLE CONCLUSION
Separate the two decisions.
ILLUSTRATIVE RECOMMENDATIONExplore solar first.
Evaluate backup on its own merits.
Under the default sample assumptions, solar has an 11.4-year simple payback. Adding the battery increases the combined payback to 14.3 years; backup value is a separate household decision.
SOLAR SENSITIVITY CHECK9.1–15.4 yearsWith the same $18,000 cost, 9,000 kWh production, 50% direct use, and $0.05 export rate, varying the avoided energy rate from $0.21 to $0.39 gives this illustrative simple-payback range. Not a prediction for your home.
Before deciding
- Confirm roof condition, shading, system design, and production assumptions.
- Replace the sample energy rates with your actual tariff and interval usage where available.
- Ask which loads a battery could support, for how long, and with what limitations.
- Compare written installed prices and financing terms. Check sensitivity to changing costs and usage.
The actual recommendation would depend on your property, utility, evidence, goals, and uncertainty. It may be to proceed, change the scope, gather more information, or wait.