schematic circuit design for gried tied pv system with battery backup

Please I need a *''schematic design for grid tied pv system with battery back up*. The load to the gried tied is ment to be mobile phone battery charger.

Any one with the with the schematic circuit design or how to go about with the design,should help me out.It is ment to be a simulation thing .

Here's what you need for a baisc grid tied, battery backed up PV system

1. PV panels
2. Combiner Box ( maybe, but likely you wont since the system would be small)
3. DC disconnects
4. Inverter
5. Charge controller
6. Battery Bank
7. AC Disconnects
8. Ground fault protection

The first thing you need for the design is the load size - how many watt per hour. Once you have this number, multiply it by the number of hours you plan on using it. For ex, if your load is 100 Watts, and you plan to use it for 10 hours a day, then the total watthr # would be 100 W x 10 Hrs = 1 KW hr

Assuming 5-6 hours of sunlight, then your basic system size would be 1000 W hr / 5 hrs = 200 Watts.

Based on this number, you can get panels, etc. Hopefully this will get you started on the design. Once you have size of panels, and thet total system size, then you can similar rating for the inverter.

Battery deisgn is different though, and let me know when you get to that step and il help you out.

See the attached schematic that shows the basic circuit design that you need for your application.

This circuit takes in 120Vac and a PV solar panel. Either the ac power or the solar panel will charge the attached 12V battery. When AC voltage is not present, either the solar panel or the battery will power the output load. The final output stage inverts the dc voltage back to AC.

The desired output power is determined by selecting the appropriate sizes of the transformers, diodes, etc. Hopefully this is a good starting point for you.

"StrykerTECH":http://www.stryker-tech.com/ Engineering Staff