Solar Panel Repair vs Replace Cost Calculator
ANA›Life Services Authority›National Calculator Authority›Solar Panel Repair vs Replace Cost Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Solar Panel Repair vs Replace Cost Calculator
Compare the total cost of repairing your existing solar panels versus replacing them with new ones, factoring in energy savings, panel age, and long-term value.
Number of Panels
Panel Age (years)
Total Repair Cost ($)
Replacement Cost per Panel ($)
Installation Cost for Full Replacement ($)
Annual Energy Savings ($/year)
Annual Panel Degradation Rate (%)
Expected Panel Lifespan (years)
Current Efficiency Loss from Damage (%)
Discount Rate / Cost of Capital (%)
Calculate
function solCalc() { var numPanels = parseFloat(document.getElementById('sol-num-panels').value); var panelAge = parseFloat(document.getElementById('sol-panel-age').value); var repairCost = parseFloat(document.getElementById('sol-repair-cost').value); var costPerPanel = parseFloat(document.getElementById('sol-cost-per-panel').value); var installCost = parseFloat(document.getElementById('sol-install-cost').value); var annualSavings = parseFloat(document.getElementById('sol-annual-savings').value); var degradation = parseFloat(document.getElementById('sol-degradation').value); var lifespan = parseFloat(document.getElementById('sol-panel-lifespan').value); var effLoss = parseFloat(document.getElementById('sol-efficiency-loss').value); var discountRate = parseFloat(document.getElementById('sol-discount-rate').value);
var errors = []; if (isNaN(numPanels) || numPanels 5) errors.push("Degradation rate must be between 0% and 5%."); if (isNaN(lifespan) || lifespan 100) errors.push("Efficiency loss must be between 0% and 100%."); if (isNaN(discountRate) || discountRate 20) errors.push("Discount rate must be between 0% and 20%."); if (panelAge >= lifespan) errors.push("Panel age must be less than the expected lifespan.");
if (errors.length > 0) { document.getElementById('sol-result').innerHTML = 'Please fix the following:' + errors.join('') + '
'; return; }
var r = discountRate / 100; var d = degradation / 100; var e = effLoss / 100;
// ── REPAIR SCENARIO ────────────────────────────────────────────────────────── // Remaining life after repair var remainingYearsRepair = lifespan - panelAge;
// Effective savings after repair restores efficiency, but degradation continues // Year t savings (t = 1..remainingYearsRepair): // annualSavings * (1 - d)^(panelAge + t) [degradation already accumulated] // NPV of repair savings stream: var npvRepairSavings = 0; for (var t = 1; t = replace NPV // npvRepairSavings - breakEvenRepair = npvReplace var breakEvenRepairCost = npvRepairSavings - npvReplace;
// ── RECOMMENDATION ─────────────────────────────────────────────────────────── var recommendation = ""; var recColor = ""; if (npvRepair >= npvReplace) { recommendation = "✅ REPAIR is the better financial decision."; recColor = "#2e7d32"; } else { recommendation = "🔄 REPLACE is the better financial decision."; recColor = "#1565c0"; }
var fmt = function(n) { return n.toLocaleString('en-US', {minimumFractionDigits:2, maximumFractionDigits:2}); };
document.getElementById('sol-result').innerHTML = '### Results ' + '' + 'MetricRepairReplace' + 'Upfront Cost$' + fmt(repairCost) + '$' + fmt(totalReplaceCost) + '' + 'Remaining Useful Life' + fmt(remainingYearsRepair) + ' yrs' + fmt(lifespan) + ' yrs' + 'NPV of Savings$' + fmt(npvRepairSavings) + '$' + fmt(npvReplaceSavings) + '' + 'Net NPV (Savings − Cost)$' + fmt(npvRepair) + '$' + fmt(npvReplace) + '' + 'Simple Payback Period' + fmt(repairPayback) + ' yrs' + fmt(replacePayback) + ' yrs' + '' + 'Annual Savings Lost to Current Damage: $' + fmt(annualLostSavings) + '/year
' + 'Break-Even Max Repair Cost (repair NPV = replace NPV): $' + fmt(breakEvenRepairCost) + '
' + '' + recommendation + '
' + (npvRepair >= npvReplace ? 'Your repair cost of $' + fmt(repairCost) + ' is below the break-even threshold of $' + fmt(breakEvenRepairCost) + ', making repair the smarter choice.
- '
- 'Your repair cost of $' + fmt(repairCost) + ' exceeds the break-even threshold of $' + fmt(breakEvenRepairCost) + '. Replacement delivers higher long-term value.
'); }
#### Formulas Used
Total Replacement Cost: Total Replace Cost = (Number of Panels × Cost per Panel) + Installation Cost
Annual Savings with Degradation (year t): Savings(t) = Annual Savings × (1 − Degradation Rate)t
NPV of Savings Stream (Repair — starts from current panel age): NPVrepair savings = Σ [Annual Savings × (1 − d)(age + t) / (1 + r)t] for t = 1 to (Lifespan − Age)
NPV of Savings Stream (Replace — starts fresh): NPVreplace savings = Σ [Annual Savings × (1 − d)t / (1 + r)t] for t = 1 to Lifespan
Net NPV: Net NPVrepair = NPVrepair savings − Repair Cost Net NPVreplace = NPVreplace savings − Total Replace Cost
Simple Payback Period: Payback = Upfront Cost / First-Year Savings
Annual Lost Savings Due to Damage: Lost Savings = Annual Savings × (1 − d)age × Efficiency Loss %
Break-Even Repair Cost: Break-Even = NPVrepair savings − Net NPVreplace
#### Assumptions & References
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