Grid-Tied vs Hybrid vs Off-Grid — Choosing the System Type

The single biggest design decision in a solar project is the system type. It sets whether you buy batteries, whether the system works in a blackout, and how the numbers pencil out.

Grid-tied (no battery)

• Solar offsets daytime load; excess exports to the grid (credited under net metering where available).
• At night, the home runs on grid power.
• Shuts down during a grid outage (anti-islanding).
• Lowest cost per kWp; best simple payback.

Hybrid (solar + battery + grid)

• Solar serves load, charges the battery, then exports.
• Battery covers evening load and rides through outages (backup loads sub-panel).
• Can shift energy from cheap or solar hours to peak-rate hours (time-of-use arbitrage).
• Higher cost; payback depends heavily on outage frequency and tariff structure.

Off-grid (no utility connection)

• The system must meet 100% of load in the worst month, with days of autonomy for bad weather.
• Large battery bank and often a backup generator.
• Array and battery are oversized versus a grid-tied system of the same “usable” output — cost per kWh delivered is the highest.
• Justified by distance from the grid or connection cost, not by payback against a bill.

Decision checklist