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efficiency while charging through solar cell.

we know that solar panel gives maximum power at particular voltage.which is a bit less then the actual rating of the panel. my aim is to get a constant voltage across the battery,okh. but can i do sth by which i can get such const voltage 4 which the power provided by by solar cell is maximum. i can introduce a microcontroller which will continuously check the voltage ......and itwill get stuck at dt particular voltage...but i am getting puzzled with dat,ne idea plz

Try this old application note from Maxim
http://pdfserv.maxim-ic.com/en/an/AN484.pdf
for some explanation of MPPT control
Steve
...also look for Maximum-Power-Point-Tracking Solar Battery Charger , a design idea by a guy called W. Stephen Woodward, and originally published in EDN. Steve