[RE-wrenches] Diode Failure

[Dan Fink]

Corey - yes, nearby lightning can zorch PV array diodes en masse, and not
always all the diodes at once. Provided they are accessible and not potted
in epoxy DigiKey can provide replacements. When the module manufacturer has
gone out of business, getting the precise specs can be impossible, but
there's nothing special about bypass diodes, the usual products should work
fine.

Dan Fink
Buckville Energy
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
NABCEP / IREC / ISPQ Accredited Continuing Education Providers™
970.672.4342



On Mon, Oct 20, 2014 at 2:51 PM, Corey Shalanski <
cshalanski at joule-energy.com> wrote:

> Wrenches,
>
> Since my previous post (see below) we have recovered the faulty modules
> and are now looking to replace the diodes in order to make them
> functional again. I have had no success sourcing replacement diodes from
> the original module manufacturer, Mage Solar.
>
> Can anyone recommend a source for replacement diodes?
>
> --
> Corey Shalanski
> Joule Solar
> New Orleans, LA
>
> ᐧ
> On Tue, Aug 5, 2014 at 10:27 AM, <
> re-wrenches-request at lists.re-wrenches.org> wrote:
>
>>
>> Message: 10
>> Date: Tue, 5 Aug 2014 09:03:09 -0500
>> From: Corey Shalanski <cshalanski at joule-energy.com>
>> To: RE-wrenches at lists.re-wrenches.org
>> Subject: [RE-wrenches] Diode Failure
>> Message-ID:
>>         <
>> CA+SmqZ1C7KSZuQnVzQr0MMuX3F2dT6YDuM40iseCzr2EJRgA+Q at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Wrenches,
>>
>> We recently were contacted by a customer who reported a lightning strike
>> close to his house. His online monitoring revealed that 30 of 35
>> microinverters simultaneously stopped producing power. On initial visit to
>> the jobsite we measured Voc on many modules - either 12V or 24V instead of
>> rated 36V. On a second visit we discovered that bypass diodes - either 1
>> or
>> 2 corresponding to observed voltage loss - had failed on each of the
>> faulty
>> modules.
>>
>> My question is: Can anyone support the theory that a nearby lightning
>>  flash
>> can cause mass bypass diode failure?
>>
>> --
>> Corey Shalanski
>> Joule Energy
>> New Orleans, LA
>
>
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