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With the selected inputs and available hardware, no system meets all design requirements.
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☀️ Solar Array
🔋 Battery
⚡ Inverter
💰 Financials
🌿 Environment
✍️ Enter Client Data
Required Solar Array (DC)
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Est. Daily Solar Production (Net)
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Array Details
Peak Sun Hours (Design GTI) —
Performance Ratio (SA spec) 80%
System Availability (SA spec) 97%
Required Solar Energy (kWh/day) —
Panel Footprint (m²)
Annual Solar Production (Net) —
Specific Yield (kWh/kWp/year) —
Generation Assumptions
Location GTI (Design Value) —
Panel Orientation —
Performance Ratio (PR) 80% — thermal losses, wiring resistance & module mismatch
System Availability 97% — maintenance & downtime allowance (SA grid spec)
Combined Yield Factor —
Temperature & Soiling Derating Included in PR — assumes quarterly panel cleaning
Reserve Margin None applied — panel count rounds up; oversizing provides buffer
⚡ System Compliance — Solar · Battery · Inverter · DC/AC — All must pass
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Battery Power During Outage
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Evening Energy Required
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Solar-off backup period only
Battery Installed Capacity
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Cross-System Compliance Check
☀️ Solar covers daytime load + battery recharge —
🔋 Battery power output ≥ peak load —
⚡ Inverter AC rating ≥ peak load × 1.3 safety margin —
🔄 Daily depth of discharge ≤ 85% (LiFePO4 spec limit) —
📐 DC/AC ratio — Nova design range (max 1.5; below 1.0 when the inverter is sized for backup) —
Battery Model
Selected Battery —
Chemistry LiFePO4 — max 85% DoD
Round-Trip Efficiency 92% (SA spec)
Capacity per Unit (Usable kWh) —
Headroom Ratio (Installed ÷ Required) —
Capacity Headroom
🔧 Revise Design
Recommended Inverter
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⚡ Run a design to check compliance
MPPT & String Allocation
PV String & Inverter Compatibility —
String Allocation —
MPPT Utilisation —
Inverter Performance
Inverter AC Continuous (kW) —
Max DC Input (kW) —
Headroom over Backup Peak —
Efficiency —
Regulatory Compliance
Grid Connection Standard
Run a design first ⚡
Grid Connection Registration —
DC / AC Ratio Visual
DC/AC Ratio — Nova design range (max 1.5; below 1.0 when the inverter is sized for backup) —
Recommended Total System Cost
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Est. Year 1 Electricity Savings
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Total Hardware (Panels + BOS)
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Cost Breakdown
25-Year Financial Model (SA Compliance Rates)
Monthly Savings (Year 1) —
Annual O&M + Insurance (2% of capex/year) —
Battery Replacement Cost (Year 10 @ 70%) —
Real Payback (escalating tariff, incl. all costs) —
NPV @ 12% Discount Rate (25 yr) —
IRR (25-year) —
Gross Lifetime Savings (25 yr, escalating) —
Net Lifetime Savings (after O&M + battery replacement) —
Annual ROI % (Year 1 gross) —
Annual Consumption (kWh) —
Tariff Escalation Assumptions (NERSA)
2026/27 (already in your tariff) 8.76%
2027/28 (applied in Year 2) 8.83%
2028 onwards 5.00% per annum (conservative)
Energy Independence
Annual Solar Production (Net) —
Annual Consumption —
Client Segment —
Solar Independence
Client Details
Client Type
🏠
Residential 4-page homeowner proposal
🏢
Commercial 8-page technical proposal — NPV, IRR, NERSA
🏠 Homeowner PDF: Plain language — savings, payback, backup hours, installation steps.
System Summary
System Run calculation first ⚡
Client Price —
Annual Savings (Year 1) —
NPV (25yr @ 12%) —
Payback (real, incl. all costs) —
AI-powered proposal via Nova Metrics pipeline.🏠 Homeowner PDF — clear, simple, deal-closing
Generate Proposal
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