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A question about one way resistors. - Page 3

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Posted by Cydrome Leader on August 11, 2008, 4:34 am
 

Hmm, you're right. I just tested some 1n5401 @ 3 amps. the worst one had
loss of 0.9v at room temp. I din't let them heat up.

Posted by Cydrome Leader on August 11, 2008, 6:52 am
 

just tried the largest (dual 160AMP) schottky I had here

http://www.irf.com/product-info/datasheets/data/163cmq.pdf

The drop was just 0.4 volts at 4 amps and 0.5 at 8.



Posted by Eeyore on August 11, 2008, 8:41 am
 

Cydrome Leader wrote:


rated

That's more like it. It really counts in low voltage systems.

Graham



Posted by bealiba on August 11, 2008, 11:21 pm
 
Just a bit of clarification. Are you talking about blocking diodes or
the bypass diodes?

Blocking Diode - A diode placed in series with a
photovoltaic module or group of modules to prevent the reverse flow of
current
through the module(s) (also called a series or isolation diode)

Bypass Diode - A diode placed in parallel with a
photovoltaic module or group of modules allowing a route for current
under
conditions of shading or cell failure (also called a shunt diode)

If you have Blocking Diodes and are using a good quality regulator you
can throw the diodes away. The reg will prevent reverse flow to the
panels.

The Bypass Diodes do a different job and should be kept in place. See
above

Posted by ukmp on August 14, 2008, 7:53 pm
 On Mon, 11 Aug 2008 16:21:40 -0700 (PDT), bealiba@gmail.com wrote:


Its a blocking diode
I`ll try removing it as you suggest and see if the controller stops
reverse flow.
Thanks
ukmp

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