Hot modules [RE-wrenches]

[Bill Brooks]

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Jeff and Matt,

I don't remember the PC4JF having jumpers and it only has 36 cells. The M75
was also a 36 cell module. No matter how you jumper them, you can't get any
more voltage than all the cells in series. The only way I know how to get
more than about 22Volts out of a 36 cell module is to jam some current into
it from another higher voltage source (like parallel connected modules). I
really don't think there is any way to explain this as a true open circuit
voltage from the module itself. There has to be another explanation.

For instance, say you had two PC4JF modules in series in a 24-Volt system.
Let's say the battery voltage is at full charge, 28.8V and one module is
fully shorted. The second module will have the entire 28.8V across it since
one end of the module is essentially connected to battery negative through
the shorted module and the positive end is connected to the battery
positive. There is no forward current in the module, and depending on the
cell there is either no reverse current (most likely-since it is illuminated
and acting as a photo diode) or there could be reverse current and heating
of the module.

Of course your friend in the V.I. may have made a new discovery, but I
really doubt it.

Bill.


-----Original Message-----
From: Matt Lafferty [mailto:mlafferty at universalenergies.com] 
Sent: Tuesday, June 20, 2006 4:33 PM
To: RE-wrenches at topica.com
Subject: RE: Hot modules [RE-wrenches]


Jeff,

My first thought in this is that the 6V/12V jumpers in the J-Boxes are
mis-installed.  I.E. All the cells are in series. 

Possibility?

Matt Lafferty 
Universal Energies Institute 
mlafferty at universalenergies.com 
(415) 252-0343 Phone 
(916) 914-2247 Fax
 

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