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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


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:


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


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
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
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

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

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.

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