Hallo,
is it correct to say that 2 of the same type of panels can be connected
in parallel to a single charge regulator.
If true, is it also correct to say that half of the total power is
available if one of the 2 panels is shaded, whereas the other one is
illuminated.
Thanks for the help !
Kind Regards
Hans
If you are referencing 12-volt systems, then you can parallel the modules
(some manufacturers recommend series fuses) as the battery state of
charge and charge rate will establish the operating voltage.
In the 12-volt case, shading a module (or even only a few cells) will
effectively stop the output of the shaded module. The other module
will continue to function.
There are both Bypass and Blocking diodes associated with
PV module wiring. I suggest visiting a major PV manufacturer's
web site and downloading a module user manual. Shell has a
good one for the SP75 series. This will explain the diodes.
Above 12 volts the bypass diodes and either blocking diodes or
fuses are required to avoid hot spot damage if a cell is shaded.
The bypass diodes limit the reverse voltage that can cause a cell
to heat up and perhaps burn due to shading. All first class modules
that meet UL, EU, or IEC standards must have installation instructions
that detail the required diodes. Many manufacturers include the
bypass diodes within the junction box. Few include blocking diodes,
but some have a place to install them in the junction box.
Bill
Bill Kaszeta
Photovoltaic Resources Int'l
Tempe Arizona USA
[email protected]
