A solar ROI estimate is only as good as its assumptions. Understanding them helps you compare proposals fairly and set realistic expectations with customers.
Consumption and effective tariff
Where both the monthly bill and units (kWh) are known, the effective tariff is simply the bill divided by units. This captures fixed charges and slabs better than a published tariff alone.
Specific yield
Annual generation per kW depends on solar resource (peak sun hours) and system performance ratio, which accounts for temperature, soiling, cable and inverter losses.
Capacity limits
Recommended capacity is usually the smallest of: what the consumption justifies, what the roof area allows, and what the sanctioned load or utility rules permit.
Cost, incentives and payback
Project cost varies with size and segment. Where incentives apply, the net cost falls. Payback compares net cost with yearly savings, adjusted for module degradation and tariff escalation over the system life.
Try the SOLCLIMB Solar Savings & ROI Calculator for an indicative estimate — and request a site survey for a firm proposal.
