It seems there is not a good explanation available online describing the differences between the different types of solar arrays: bipolar, grounded and ungrounded mono-polar. Is this every one else's experience?

 

It has been my experience that these differences have all been satisfactorily explained.

(Awaiting your next question.....)

 

Is there a good publication explaining it? It appears to not be available on the web. Too many irrelevant results nowadays.

 

Solar power systems have been covered by the National Electrical Code since 1985. In the US ungrounded systems are either frowned upon or explicitly prohibited. Low voltage systems (under 40 volts or so) are allowed to be ungrounded IF both conductors are switched and fused where needed. It's usually cheaper to just run a ground.

Unipolar arrays are best for single DC systems such as keeping a battery bank charged. Bipolar arrays are best for direct to grid AC systems where the dual voltages simplify the inverter design.

Photovoltaic Power Systems And the 2005 National Electrical Code: Suggested Practices by John Wiles of the Southwest Technology Development Institute, New Mexico State University. Latest version I am aware of is "ELECTRONIC VERSION 1.91 Dated March 29, 2010."

(Use the right side links for "Front Matter" and "Body." The left side links have gone stale.)

This is not a quick read for the beginner. Many details will require you to reference the National Electrical Code itself (that is available for viewing online). Several example systems are discussed. Potential sources for components is also included.