solar panel charge controller circuit

I need diagrams or circuit diagrams of solar charge controllers?
I have a solar panel that can give up to 20v DC power supply ….. I do load circuit that can charge a 12v gel battery …. anyone knows any site with useful circuit design?
I did two searches Google. The first of [solar charge controller circuit diagram] http://www.google.com/search?hl=en&q=solar+charge+controller+circuit+diagram&rlz=1R2GGLL_en&aq=2&oq=solar+charge+controller&aqi=g10 Did not see much there until I reached the bottom of the page. Several links to match other searches. [solar charger circuit diagram of the battery] http://www.google.com/search?hl=en&safe=off&rlz=1R2GGLL_en&newwindow=1&q=solar + + Battery Charger + circuit + diagram & revid = 1321056361 & ei = sSYtSo75IKXoswOQrqmCCw & sa = X & oi = revisions_inline & resnum = 0 & ct = broad-revision & cd = 1 [solar wiring diagram] http://www.google.com/search?hl=en&safe=off&rlz=1R2GGLL_en&newwindow=1&q=solar+wiring+diagram&revid=1690969710&ei=RigtStSUMp-ctgPxhZzmCg&sa=X&oi = revisions_inline & resnum = 0 & ct = broad-revision & cd = 3 [solar charger circuit diagram of the battery] http://www.google.com/search?hl=en&q=solar+charge+controller+circuit+diagram&rlz=1R2GGLL_en&aq=2&oq=solar+charge+controller&aqi=g10 The most promising thing so far. Voltage Doubler for Solar Battery Charger – SolarFind how to make a current controlled solar battery charger using LM317T one … Learn how to build an AC voltage doubler circuit. … It is part down the page is this link, Solar Charge Controller More on Solar Charge Controllers Article Last Updated: 15:43, 29 July 2008 Solar | Shopping | http://www.reuk.co.uk/Solar-Charge-Controller.htm electrical circuit to another link: Solar Charge Controller Find out more about solar solar charge controllers | Electronic | Electrical Ok http://www.reuk.co.uk/electric-circuit.htm circuit I quit, much to see though. search Next [solar charge controller schematic] http://www.google.com/search?hl=en&q=solar+charge+controller+schematic&rlz=1R2GGLL_en&aq=5&oq=solar+charge+controller+&aqi=g10 This new, more promising projects and schemes of various circuits there. You are only allowed 10 links in an answer here. The final result is where I want begin. Sounds like an interesting project, wishs best for you. Wingman
Simple Solar Battery Charging System