Solar cells for trickle charging 9v "driveway alert"

[Gern]

I was looking at this driveway alert system that alerts you when
someone is coming up your long driveway. A co-worker has one, except
that he says he has to replace the batterys twice a year.

http://www.drivewayalert-usa.com/index.htm

The 9volt would only need a tiny trickle of current to keep up. The
problem is getting nine volts with hardly any current. Can solar
cells andle this?

Has anyone done anything like this?

Thanks
Gern

 

[Fred Stevens]

gernith@yahoo.com (Gern) wrote in message news:<15376196.0407120727.1e30f125@posting.google.com>...

I was looking at this driveway alert system that alerts you when
someone is coming up your long driveway. A co-worker has one, except
that he says he has to replace the batterys twice a year.

http://www.drivewayalert-usa.com/index.htm

The 9volt would only need a tiny trickle of current to keep up. The
problem is getting nine volts with hardly any current. Can solar
cells andle this?

Has anyone done anything like this?

Thanks
Gern

Solar cells that are readily obtainable (from Radio Shack etc) produce
about 0.5V per cell. You can create a 9V supply from a series
combination of these or perhaps find a solar panel that will give more
voltage.

Fred.

 

[JeffM]

The 9volt would only need a tiny trickle of current to keep up.
The problem is getting nine volts with hardly any current.
Gern

A shunt?
http://www.google.com/search?&q=pease+solar+charging+anyhow+print-cfm