How a Solar Power system works ? Simple Anology

Solar Power system Connected to Grid

How it works ?

Ø Solar Grid-Tied systems use PV panels to generate DC power. The DC power goes to a grid interactive (grid-tied) inverter which converts the PV panel DC power to 240 volt AC power that is compatible with the power grid. The power from the PV panels goes (via the grid tie inverter) to supply the household power needs.

Ø If the PV system is generating more power than the house can use, the excess is sent out over the grid to supply others. If the house needs more power than the PV system can supply, then the extra is drawn from the grid as usual.

Ø Grid tied systems only work when the grid is up. If the grid power goes out, the grid tie inverter is required to shut down immediately.

Solar Power system with Battery Backup

How it Works ?

Ø Off-Grid systems are independent of the utility power grid. They generate electricity, store it, and make it available for use without any connection to the power grid.

Ø Off-Grid systems use PV panels connected to a Charge Controller to charge a set of batteries. The stored energy from the batteries is usually converted to regular 240 volt, AC power by an inverter. But, some small systems just use the DC power directly from the batteries.

Solar Power System with Battery Backup and with Grid Connection

Ø A grid tied with batteries system is kind of a mix of the two system. It basically operates like a grid tied system when the grid is up, but it also charges a set of batteries.

Ø If the grid goes down, the inverter disconnects from the grid (to protect line workers), but it continues to supply power to the house from the batteries and inverter -- essentially behaving like an off-grid system when the grid is down.

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