The grid tied solar system working mode:
First use the solar power first, and there would be 2 condition:



For example, your energy need is 5kw, and solar supply 3kw, the rest 2kw will get from the grid. In this time, solar can still help you save bills.
But when the grid is down, the grid tie solar system will not working.
This is to protect the people who is repairing the grid.

Although there are a double way meter in this photo, if your place not support sell solar power to the local power company, you can put a 0 export to stop the exceed power send to the grid.

The inverter has external zero export function. This function is optional. It can collect countercurrent power to control the output power of the inverter, so that the power of inverter and load can be offset, and the excess power will not be fed back to the grid.

This is a connection diagram of a sensor clamp, which will stop the exceed solar power send to the grid.

If you don’t have the 0 export, and your local power company not support sell solar power, and your solar is more than energy need, the exceed power to feed to the grid.

That means you will have to paid the exceed solar power. That’s not help you save the bill but to heavy your bills.

The city grid power is stable in his place, but expensive. Before he choose to use the solar system, his bill is around $15,840 for one month around 72000kwh.

This is a food factory with Color steel sheet, 48m x 40m.

After we assessing the site’s electricity demands it was established that a 200kW solar array was the best fit. Firstly, when sizing a solar array we look to understand the client's goals. In this instance, it was to max returns so we designed a solar system as large as possible whilst keeping export to a bare minimum. As a result, this system comprises 6pcs 33kw inverter and 200kw panels across the shop roof and canopy; max the total roof space.

And the solar panel power is 200kw, in our plan, the system will help him reduce 30000kwh each month. Because in Philippines, the sun conditioner is really good, the factor can be 0.85 most in our plan.

With the help of solar panel, the electricity reduce half compared to before.

And the system cost is return in the third year, and enjoy free solar power at the 4th year.

In the food factory grid tied solar system, there are 6pcs 33kw inverter. And each inverter with 33kw solar panel.

When the grid stop, the inverter will stop, won't send any power to the grid. Because when the grid stop, the people may work in the utility power line for repair. The stop power will hurt the worker. So every grid time solar inverter is design when the grid stop, it stop.

Bob is one of  the creators of InkPV. He uses experience in marketing and knowledge from her master's in climate communications to research and review the solar and wind industry.