An on-grid solar electric system generates solar electricity through solar panels and routes it to the main utility grid. The homeowner lives as if connected to only the grid, except some or all electricity comes from the sun. There are four cases: 1) Only solar energy supplies households during sunny periods. 2) Solar and grid energy are both used on cloudy or rainy days when solar is insufficient. 3) Excess solar energy is routed back to the utility grid. 4) At night, households rely solely on grid energy with no solar available.

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2. Solar on grid is also known as grid- tied or utility
interactive system. It generates solar electricity through
solar panels and route it to the utility grid. Living with an
on-grid solar electric system is the same as living with
grid power, except that some or all electricity you use
comes from the sun.
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3. There are four different cases we are going to study now :
Case 1 : ONLY SUN ENERGY
The solar panel collects the sun energy. The dc solar
electricity goes through the dc disconnect switch to the
DC/AC inverter where it will be converted to AC. Through the
AC panel breaker AC electricity will then supply to your
households.
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4. Case 2 : SUN + GRID ENERGY
In some cases sun energy is not sufficient so we use sun +
grid energy i.e. in cloudy or rainy days
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5. Case 3 : SUN and EXCESS ENERGY
In case there is excess of sun energy from your house it will
sometimes turn the electric meter backward to the utility
grid.
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6. Case 4 : GRID ENERGY AT NIGHT
At night, we have no energy comming from sun so we are
left with only one option i.e. utility grid.
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