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.