Solar Battery Backup vs Grid-Tie Only
**Grid-tie solar** maximizes bill savings when the grid is up but shuts down in many outages (anti-islanding). **Battery backup** adds resilience and time-of-use arbitrage at higher upfront cost.
Step by step
1. List outage priority loads
Fridge, comms, well pump—size battery kWh accordingly.
2. Compare installed $/W
Batteries add $8k–$20k+ depending on chemistry and incentives.
3. Check utility NEM rules
Export credits affect payback with or without storage.
Battery vs grid-tie only
Batteries are insurance + arbitrage; grid-tie is pure bill reduction.
- Grid-tie only: Lower cost; fastest payback in high-rate regions.
- With battery: Backup power; peak shaving; longer payback.
Common mistakes
- Undersizing battery for HVAC
- Ignoring battery cycle warranty
FAQ
Will solar work in a blackout without a battery?
Most grid-tie systems shut off unless you have a secure backup configuration.