Help needed Led lamp design

[protoype1905]

Hi I am high school student I need help in designing led based lamp the requirements are as follows:

Design battery charger circuit, it should charge the battery from adapter or solar panel

Battery=12v and its capacity should be calculated from load and 4 hrs min run time

Charger indication light during charging battery

Battery fully charged indication with same light

Charging should be started automatically when a person plugs adapter or solar panel. During charging the load should be off

Load = 21 LEDs big size 10mm make set of 3 LEDs in series and these sets are in parallel

Low battery turn off it should be completely shut down

Minimum no. of components.

 

[salmanliaquat]

Hi,
you can find many circuits for battery charging and for overcharge or over-discharge protection.
I did designed such charging circuit some months ago. I am attaching a file. Hope this would help.

Regards,
Salman.