1 System Variables
⚡ Consumption
☀️ Solar
🔋 Battery
💰 Component Prices (EGP)
🧾 Tariff & Payback
System Design
| Parameter | Value |
|---|
Required array power = daily consumption ÷ peak hours ÷ efficiency. Panels are rounded up to the nearest panel. Battery = consumption × autonomy ÷ depth of discharge, rounded up to whole market modules (e.g. 5 kWh units).
Cost Breakdown
| Item | EGP |
|---|---|
| Total investment | — |
All prices editable in the variables panel. Battery cost scales automatically with the required bank size.
Payback Period
| Metric | Value |
|---|---|
| Grid bill avoided (per month) | — |
| Savings per year | — |
| Simple payback (no escalation) | — |
| Payback with escalation | — |
| Net savings after 25 years | — |
Monthly bill = daily consumption × tariff × 30.4 days. Escalation compounds the annual savings at the chosen rate.
Savings Over Time
Brand Recommendations — Egyptian Market
Indicative prices (EGP). You can edit cells to keep them current — changes are saved in your browser.
| Category | Brand | Model / Notes | Price (EGP) |
|---|
Panels: JA Solar, Jinko, Longi and Canadian Solar are widely available at ≈ 5,800–6,200 EGP for 590 W. Inverters: Growatt / Deye / Sofar / Luxpower / Must dominate the market. Batteries: prefer LiFePO4 wall-mount or rack batteries from local assemblers (check warranty ≥ 5 years).
Assumptions
• The system fully replaces the grid connection (off-grid, no grid backup).
• Example design: daily consumption 10 kWh → 4 × 590 W panels, 3 kW inverter, ~20 kWh battery bank, ≈ 70,000 EGP + battery.
• Egypt average peak sun hours: 5.5 h/day; 20% system losses assumed.
• The household meter reading is the daily consumption (kWh) entered above — adjust it to match your own meter.
• Prices are market estimates and must be confirmed with suppliers before purchase.