Positive ground with batteries? [RE-wrenches]

[Hugh Piggott]

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hi wrenches,
>
>If the modules are positive ground, you can not ground
>the battery positive,,,

I am puzzled by these Sunpower panels/modules/cells.  I have 
installed some 12V modules on 12 volt systems.  But if the system 
voltage is higher, what happens?  The modules can't all have positive 
grounded!  The ground would short them out.

Anyone know the reason why the Sunpowers need this positive ground, 
and what to do with series strings of cells/modules?  I assume that 
you ground the positive end of the string, but then the positive end 
of the other modules is not grounded at all.  Is it simply necessary 
to keep all the PV stuff negative with respect to ground and if so 
why?

Just trying to get some insight, thanks
-- 
Hugh

Scoraig Wind Electric
http://www.scoraigwind.co.uk/

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