T
terryc
Guest
Where do people source these?
Or are they not a requirement of modern panels?
T.I.A.
Or are they not a requirement of modern panels?
T.I.A.
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G
Graeme Zimmer
Guest
Terry, it depends........Where do people source these?
Or are they not a requirement of modern panels?
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
T
terryc
Guest
Graeme Zimmer wrote:
one to prevent themsucking from higher ooutput panels,
umm, if they need one for night time discharge, then they will each needWhere do people source these?
Or are they not a requirement of modern panels?
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
one to prevent themsucking from higher ooutput panels,
That is the tricky part.Whatever, a standard Schottky diode (with sufficient current rating) is
normally specified.
D
David Eather
Guest
On 8/04/2011 1:17 AM, terryc wrote:
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.
What trick?Graeme Zimmer wrote:
Where do people source these?
Or are they not a requirement of modern panels?
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
umm, if they need one for night time discharge, then they will each need
one to prevent themsucking from higher ooutput panels,
Whatever, a standard Schottky diode (with sufficient current rating)
is normally specified.
That is the tricky part.
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.
G
Graeme Zimmer
Guest
True, but the leakage current is fairly small, so while the total leakageumm, if they need one for night time discharge, then they will each need
one to prevent them sucking from higher output panels,
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
T
terryc
Guest
David Eather wrote:
Who sells them in that size?Whatever, a standard Schottky diode (with sufficient current rating)
is normally specified.
That is the tricky part.
What trick?