Investment Verdicts for EV and Solar ROI Calculations
This page defines standardized investment verdicts used across our calculators. Each verdict is derived from transparent ROI thresholds and applied consistently across regions and models.
EV Calculator Verdicts
Metric: Savings percentage (EV vs Gas fuel costs)
Thresholds: Excellent ≤ 50, Good ≤ 25, else Long/Modest
Try the calculator →Excellent Choice
Significant cost advantage over gasoline
Definition
An EV configuration where fuel cost savings exceed 50% compared to an equivalent gasoline vehicle.
Typical Characteristics
- •High local gasoline prices
- •Low electricity rates
- •Moderate to high daily driving distance
- •Efficient EV model selected
Threshold Logic
If savingsPercent >= 50% → "Excellent Choice"Good Value
Meaningful savings with additional benefits
Definition
An EV configuration where fuel cost savings range from 25% to 50% compared to gasoline.
Typical Characteristics
- •Moderate electricity rates
- •Average gasoline prices
- •Standard commute distances
Threshold Logic
If 25% <= savingsPercent < 50% → "Good Value"Modest Savings
Consider total cost of ownership factors
Definition
An EV configuration where fuel cost savings are below 25%. Non-financial benefits may still justify the switch.
Typical Characteristics
- •High electricity rates relative to gas
- •Lower daily driving distances
- •Premium EV model with higher consumption
Threshold Logic
If savingsPercent < 25% → "Modest Savings"Solar Calculator Verdicts
Metric: Payback period (years to recover investment)
Thresholds: Excellent ≤ 8, Good ≤ 15, else Long/Modest
Try the calculator →Excellent Investment
Fast payback with strong long-term returns
Definition
A solar configuration where the system pays for itself within 8 years through electricity savings.
Typical Characteristics
- •High electricity rates
- •Strong solar incentives or rebates
- •High sun exposure (peak hours)
- •Optimal roof orientation
Threshold Logic
If paybackYears <= 8 → "Excellent Investment"Solid Long-Term Value
Designed for committed homeowners
Definition
A solar configuration where the system pays for itself within 9 to 15 years.
Typical Characteristics
- •Moderate electricity rates
- •Average solar irradiance
- •Some incentives available
Threshold Logic
If 8 < paybackYears <= 15 → "Solid Long-Term Value"Long Payback Period
Optimized for energy independence over short-term ROI
Definition
A solar configuration where the break-even period exceeds 15 years. This setup prioritizes long-term energy independence rather than short-term financial return.
Typical Characteristics
- •High upfront system cost
- •Limited incentives
- •Lower electricity rates
- •Moderate sun exposure
Threshold Logic
If paybackYears > 15 → "Long Payback Period"Combined EV + Solar Verdicts
Metric: Break-even period (years to recover total investment)
Thresholds: Excellent ≤ 7, Good ≤ 12, else Long/Modest
Try the calculator →Excellent Investment
Fast payback with strong long-term returns
Definition
An EV + Solar configuration where the combined investment is recovered within 7 years through fuel and electricity savings.
Typical Characteristics
- •High gasoline prices
- •Strong solar/EV incentives
- •High daily driving distance
- •Good sun exposure
Threshold Logic
If breakEvenYears <= 7 → "Excellent Investment"Solid Long-Term Value
Designed for committed homeowners
Definition
An EV + Solar configuration where the combined investment is recovered within 8 to 12 years.
Typical Characteristics
- •Moderate fuel and electricity rates
- •Standard incentives
- •Average driving patterns
Threshold Logic
If 7 < breakEvenYears <= 12 → "Solid Long-Term Value"Long Payback Period
Optimized for energy independence over short-term ROI
Definition
An EV + Solar configuration where total investment is recovered only after extended ownership (beyond 12 years). This setup favors long-term sustainability goals.
Typical Characteristics
- •High upfront costs
- •Limited incentives
- •Lower driving distances
- •Higher electricity rates relative to gas savings
Threshold Logic
If breakEvenYears > 12 AND totalAnnualSavings > 1% of investment → "Long Payback Period"