Blocking diodes for paralle PV setup

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Where do people source these?
Or are they not a requirement of modern panels?

T.I.A.

Re: Blocking diodes for paralle PV setup

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Terry, it depends........

If the panels are simply in parallel, then no individual diodes are needed,
although one diode may be needed in series to prevent night-time disharge
(but the regulator normally provides this function).

If the panels are in series, then a bypass diode may be needed if there is
risk of shading individual panels.

Whatever, a standard Schottky diode (with sufficient current rating) is
normally specified.

regards ............ Zim



Re: Blocking diodes for paralle PV setup
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umm, if they need one for night time discharge, then they will each need
one to prevent themsucking from higher ooutput panels,


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That is the tricky part.

Re: Blocking diodes for paralle PV setup
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What trick?

The solar panels already have a maximum current rating - get a diode
with a bigger current rating than that. The panel also has a maximum
voltage rating make sure the diode reverse voltage specification is
bigger than that.

Re: Blocking diodes for paralle PV setup

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Who sells them in that size?

Re: Blocking diodes for paralle PV setup
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True, but the leakage current is fairly small, so while the total leakage
for all of the panels may be significant,
for an individual panel, probably not. And it would only happen if a panel
was totally shaded (eg completely black).

It has long been debated whether the forward power loss of a Schottky is
less than the leakage lost overnight.

Better is the active FET switching in the modern regulator.

.................. Zim



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