The Solar Panels

27. May 2009 by gmoney.

We are using 9 Pitsco “Ray Catcher” Solar Panel’s:

http://shop.pitsco.com/store/detail.aspx?ID=2550&bhcp=1

Each panel is rated at just over 3 watts (2.8 volts x 1,100mA), however our testing found each panel would output 3.0 to 3.25 volts in full sun (in February no less).   Preliminary sample circuit tests also showed that 2 panels in series were sufficent to charge up our 6V batteries.

The circuit we will assemble for the proto-boat tests will be 3 circuits with 2-panels in series and 1 circuit with 3-panels in series.  Those 4 circuits will then be connected in parallel.

There will be no diodes for 2 reasons: 1) we can’t afford the voltage drop, and 2) backwards current is unlikely to be substantial (i.e. it will be less than efficiency loss of a diode) and will not damage the panels themselves.

If anyone has a problem with mixing different voltage circuits in a parallel connection, or a problem with not using diodes — speak now or forever hold your peace.

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