Grid vs Off-Grid Calculator
Compare solar system types and find the best solution for your needs
System Requirements
Solar panel capacity in kilowatts
Your current average monthly electricity cost
Required backup duration for off-grid/hybrid systems
Percentage of time electricity grid is available in your area
Requirements: 5kW system, ₹3,000/month
Grid: 95% available, Backup: 8h needed
Grid-Tied System
System Cost
₹3,75,000
After Subsidy
₹2,97,000
Components:
Solar PanelsGrid-Tie InverterMounting StructureNet Meter
✅ Advantages:
- • Lower initial cost
- • Eligible for government subsidy
- • Sell excess power to grid
- • Low maintenance
❌ Disadvantages:
- • No power during grid outage
- • Dependent on grid availability
- • Net metering policy required
Off-Grid System
System Cost
₹11,95,000
Net Cost
₹11,95,000
Components:
Solar PanelsBattery BankHybrid InverterCharge ControllerMounting Structure
✅ Advantages:
- • Complete energy independence
- • Power during grid outages
- • Good for remote areas
- • No electricity bills
❌ Disadvantages:
- • Higher initial cost
- • Battery replacement needed (10-15 years)
- • Not eligible for most subsidies
- • Requires larger battery bank
Hybrid System
System Cost
₹8,10,000
After Subsidy
₹7,32,000
Components:
Solar PanelsBattery Bank (smaller)Hybrid InverterNet MeterMounting Structure
✅ Advantages:
- • Best of both worlds
- • Power backup during outages
- • Can sell excess to grid
- • Eligible for subsidy
- • Flexible operation
❌ Disadvantages:
- • Higher cost than grid-tied
- • More complex installation
- • Battery maintenance required
Cost Comparison
Visual comparison of system costs and annual electricity bill
Our Recommendation
Hybrid System - Best balance of backup power and grid connectivity
Most Economical
Grid-Tied: ₹2,97,000
Best Balance
Hybrid: ₹7,32,000
Full Independence
Off-Grid: ₹11,95,000
How Solar System Types Compare
Cost Calculation
Grid-tied: Solar panels (₹3,35,000) + Grid-tie inverter (₹40,000) - Subsidy (₹78,000)
Off-grid: Additional battery cost (₹8,00,000) for 8h backup
System Selection Logic
Your grid availability: 95% | Monthly bill: ₹3,000
• Grid ≥98% + Bill ₹5000 → Grid-tied | Grid 90% → Off-grid | Otherwise → Hybrid
Battery Requirements
Battery capacity needed = System size × Backup hours × 80% efficiency = 5kW × 8h × 0.8 = 32 kWh
Lithium battery cost: 32 kWh × ₹25,000/kWh = ₹8,00,000
Subsidy Information
Government subsidy for grid-tied and hybrid systems: ₹30,000/kW up to 2kW, then ₹18,000/kW up to 3kW (max ₹78,000)
Your 5kW system subsidy: ₹78,000 | Off-grid systems typically not eligible
System Comparison Summary
| Feature | Grid-Tied | Off-Grid | Hybrid |
|---|---|---|---|
| Initial Cost | ₹3,75,000 | ₹11,95,000 | ₹8,10,000 |
| After Subsidy | ₹2,97,000 | ₹11,95,000 | ₹7,32,000 |
| Power During Outage | ❌ | ✅ | ✅ |
| Sell to Grid | ✅ | ❌ | ✅ |
| Battery Required | ❌ | Full | Partial |
| Maintenance | Low | High | Medium |
Your 5kW System Analysis:
Monthly Bill: ₹3,000
Annual Cost: ₹36,000
Grid Reliability: 95%
Backup Needed: 8h
Best Option: Hybrid System
Estimated Savings: 70-90%
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