Battery vs Grid-Only Solar – Complete Comparison

Compare adding battery storage vs grid-only systems: costs, benefits, backup power, and ROI analysis

Key Differences

Grid-Only System

  • ✓ Lower upfront cost
  • ✓ Simpler installation
  • ✓ Net metering benefits
  • ✓ Better ROI for most users
  • ✗ No backup power
  • ✗ No power during outages

Battery Storage System

  • ✓ Backup power during outages
  • ✓ Store excess energy
  • ✓ Time-of-use optimization
  • ✗ Higher upfront cost ($1,000-$3,000+)
  • ✗ Longer payback period
  • ✗ Limited capacity for 800W systems

Cost Analysis

Adding battery storage typically increases system cost by $1,000-$3,000, which can extend payback period by 2-5 years. For 800W balcony systems, batteries may not provide sufficient backup capacity for extended outages.

When Battery Storage Makes Sense

  • Frequent power outages in your area
  • Time-of-use electricity rates (store during day, use at night)
  • No net metering available
  • You want energy independence
  • You have larger system (1kW+)

When Grid-Only is Better

  • Reliable grid with net metering
  • You want maximum ROI
  • Lower upfront cost is priority
  • Rare power outages
  • Smaller system (400-800W)

💡 Recommendation

For most 800W balcony systems, grid-only provides better ROI. Battery storage is most valuable for larger systems, areas with frequent outages, or time-of-use rate structures. See our battery storage guide for more details.