http://ludens.cl/Electron/solarreg/Solarr~1.htm
(same circuit also here:
http://www.eleccircuit.com/solar-panel-voltage-regulator-by-lm358/)
If you go to the first link, there is a circuit for a satisfactory regulator up to 10A. CLick on it for a better image that you can print out. You can make it more current by paralleling the output FET with another. Note that Q3 the power switch is a P channel FET, not the more common N channel. The op amps are a CMOS rail to rail type, with no diode clamps on the inputs. They are +/- 8V rated (so 16V maximum). The panel can put out 22V when the battery is disconnected, so that is why they have a regulator. It is also the reference voltage. The transorb can be replaced by a 100nF capacitor. The thermistor can be replaced by a resistor of the same value. It is to adjust the charge voltage for temperature when using gel type (SLA) batteries. No need for a deep cycle or car battery (flooded electrolyte). It is a good idea to put a “gate stopper” resistor in series with PFET gates to make sure it cannot oscillate – 100 ohms. Q2 is a preregulator so the 7805 is safe with a 24V panel, not needed for 12V. S1B is not used (see parts list). The equalise switch is to give an overcharge, not really needed.
simple shunt
http://ludens.cl/Electron/solar2/solar2.html
solar garden light circuit:
http://www.talkingelectronics.com/projects/SolarLight/SolarLight.html
5v from solar garden light:
http://www.talkingelectronics.com/projects/PowerSupply5vSolar/PowerSupply5vSolar.html
12v charger from garden lights
http://www.talkingelectronics.com/projects/SolarCharger/SolarCharger.html
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