Commercial Systems
Solar C&I Savings & Payback Calculator
Inputs
FX: loading (offline fallback available)
One-off investment. Default ₦120,000,000.
Generation (required)
Sum of module DC ratings at STC.
CF = annual kWh ÷ (kW × 8,760 h).
Auto-filled by country: 20%
Share of PV used on-site (not exported).
Local grid price in selected currency. Default NG: ₦210/kWh.
Optional
Annual operations & maintenance cost.
Leave blank if no diesel generator.
Estimated share of diesel usage displaced by PV.
Formulae: Annual kWh = kW × 8,760 × CF%; Annual savings = Self-used kWh × Tariff + Diesel/month × 12 × Replace%;
Net cash flow = Savings − O&M; Payback = CAPEX ÷ Net cash flow.
Results (auto)
Annual savings (est.)
—
Energy bill saved: —
Diesel displaced: —
Definition: money not paid to grid/diesel per year.
Simple payback
—
Net cash/year (save − O&M): —
Simplified ROI: —
Payback = CAPEX ÷ Net cash flow.
Annual generation (est.)
—
Self-consumed / Exported (kWh): —
Note: exported PV is valued at 0 unless you have net metering.
Heads-up: Quick screening only—does not include complex tariffs, peak-shaving, or incentives. Use as a starting point for detailed design.
