On Sun, 20 Nov 2005 18:45:18 GMT, "west"
wrote:

That's what I'm looking for, Default. Do you have your panels in parallel?
What kind are they (voltage, name, etc.)? Also, would you happen to remember
the Amateur Handbook's year? Thank you.

west

My current copy 1990 doesn't show it so it must predate that.

It does show a typical linear shunt regulator sans parts values.

It also shows a more complicated solar charge controller that uses a
2N3055 in the negative leg of the panel to interrupt charging when
full charge is reached. Uses a 3 terminal regulator for a reference
and a 741 for a controller

The LM 723 has a reference and op amp in one package and Zener on the
output to compensate for the .6 volts out when the op amp is "off."
(Zener is on the 14 pin dip, the 10 pin TO5 doesn't have it)

http://www.jaycar.com.au/images_uploaded/LM723.PDF

Is the datasheet for the 723 and it shows a 5V regulator on page 10 -
you'd just have to change the reference.. That's the same circuit in
the handbook - but they used an adjustable setpoint, and an LED to
indicate when it was limiting the charge.

I have two 12 volt one amp panels in parallel. OC voltage is ~15
volts and it uses half circle cells ~18" X 20" I got them ages ago.
All it says on it is "sold as is" stamped into the silicon cladding on
the bottom. No idea of the manufacturer. The panels have a textured
heavy glass surface in a metal frame and appear to be something off a
really die- hard commercial application.

Download the data sheet. It is so simple . . . Only caveat - make
your heatsink up to the task of dissipating the heat. The LED is
handy too since you can set your charge with just a voltmeter on the
output - disconnect the battery you're charging and just set the
voltage to limit at.
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