These are highly intelligent PV systems that offer the best of power worlds. Tied to the grid during normal operations, using solar power to charge batteries and allowing feed-in back to the grid (if allowed in your area), these systems can convert to stand-alone systems when the grid goes down, inverting power from the solar panels and batteries to provide for the home's needs.

• Provides grid independence in the event of a grid power outage, pushing solar and battery power to the home.

• Benefit from grid-tie when required.

• Achieve high utilization of PV produced power compared to off-grid solutions.

• More complex design and installation process.

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Off-grid systems are designed to be stand-alone systems that operate without any grid connection. The PV panels need to be sized to generate the full power requirement of the site, and recharge the batteries at the same time, and a large battery bank is needed to store power for periods when solar power is not available.

• Generally the most expensive configuration due to the high number of batteries needed to store the entire home's power requirements for a few days of backup.

• May still result in blackouts when batteries are over-used or solar conditions are poor.

• Off-grid systems often have a backup power source like a generator.

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