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Message: <blockquote data-quote="Naughtykolla48" data-source="post: 31552066" data-attributes="member: 565113">Integrating a 40kW commercial solar PV system significantly lowers operating costs by generating low-cost daytime power, substantially reducing the project's overall payback horizon.<h3>1. Updated Capital Expenditure (CapEx)</h3> <table style='width: 100%'><tr><td>Investment Component</td><td>Base Cost (LKR)</td><td>Description</td></tr><tr><td>60kW DC Charger + Grid Substation</td><td>LKR 7,100,000</td><td>Fast charger, transformer connection, civil works & signage</td></tr><tr><td>40kW Commercial Solar System</td><td>LKR 4,400,000</td><td>Tier-1 On-grid solar panels, inverter, mounting & grid-tie setup</td></tr><tr><td>Total Combined Investment (CapEx)</td><td>LKR 11,500,000</td><td></td></tr></table><h3>2. Solar Generation & Cost Offset Model</h3> <ul> <li data-xf-list-type="ul">Solar Generation: A 40kW system in Sri Lanka generates ~4,800 kWh per month (~160 kWh/day assuming 4.0 peak sun hours).</li> <li data-xf-list-type="ul">Cost Offset Value: Every kWh generated directly offsets grid power purchases from CEB (~LKR 87/kWh).</li> <li data-xf-list-type="ul">Monthly Power Savings: 4,800 kWh × LKR 87/kWh = ~LKR 417,600 saved per month.</li> <li data-xf-list-type="ul">Excess Export (Net Plus/Net Accounting): If energy demand is lower than generation, excess power exported to CEB earns ~LKR 17.46/kWh under rooftop feed-in rates.</li> </ul><h3>3. Recalculated Monthly Profit & ROI Comparison</h3> <table style='width: 100%'><tr><td>Metric</td><td>Low Utilization (4 sessions/day)</td><td>Moderate Utilization (8 sessions/day)</td><td>High Utilization (12 sessions/day)</td></tr><tr><td>Monthly Power Demand</td><td>3,000 kWh</td><td>6,000 kWh</td><td>9,000 kWh</td></tr><tr><td>Gross Monthly Revenue</td><td>LKR 390,000</td><td>LKR 780,000</td><td>LKR 1,170,000</td></tr><tr><td>Net CEB Energy Cost</td><td>+LKR 31,400 (Net Export)</td><td>(LKR 104,400)</td><td>(LKR 365,400)</td></tr><tr><td>Fixed Operating Expenses</td><td>(LKR 65,000)</td><td>(LKR 75,000)</td><td>(LKR 85,000)</td></tr><tr><td>Net Monthly Profit</td><td>LKR 356,400</td><td>LKR 600,600</td><td>LKR 719,600</td></tr><tr><td>Annual Net Profit</td><td>LKR 4,276,800</td><td>LKR 7,207,200</td><td>LKR 8,635,200</td></tr></table><h3>4. Payback & ROI Comparison (Standalone vs. Solar-Integrated)</h3> <table style='width: 100%'><tr><td>Scenario</td><td>Standalone 60kW DC Charger</td><td>Solar-Integrated 60kW DC Charger</td><td>Financial Gain / Impact</td></tr><tr><td>Total CapEx</td><td>LKR 7.1 Million</td><td>LKR 11.5 Million</td><td>+LKR 4.4M additional upfront</td></tr><tr><td>Low Traffic Payback</td><td>9.2 Years</td><td>2.7 Years</td><td>6.5 years faster payback</td></tr><tr><td>Moderate Traffic Payback</td><td>3.2 Years</td><td>1.6 Years</td><td>50% reduction in payback time</td></tr><tr><td>High Traffic Payback</td><td>2.0 Years</td><td>1.3 Years</td><td>Rapid capital recovery</td></tr><tr><td>Annualized ROI (Moderate)</td><td>30.9%</td><td>62.7%</td><td>2x return on invested capital</td></tr></table><h3>Key Takeaway</h3>Adding solar increases upfront CapEx by 62%, but boosts annual net earnings by 220%+ at moderate usage. This turns the project into an energy-independent asset that hedges against future CEB electricity rate increases.</blockquote>

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