[RE-wrenches] Sanyo HIT module diode issues

Taiyoko Sadewic taiyoko at positiveenergysolar.com
Thu Jul 6 15:39:01 PDT 2017


Yes I did Brian, with and without the diode.  That's how I found what I
thought was a bad diode.

On Thu, Jul 6, 2017 at 4:21 PM, Brian Mehalic <brian at solarenergy.org> wrote:

> Did you test the voltage of the individual cell banks in the module with
> the diodes out?
>
>
> Brian Mehalic
> NABCEP Certified Solar PV Installation Professional™ R031508-59
> 520.204.6639 <(520)%20204-6639>
>
> Solar Energy International
> http://www.solarenergy.org
>
> SEI Professional Services
> http://www.seisolarpros.com
>
>
> On Thu, Jul 6, 2017 at 6:18 PM, Taiyoko Sadewic <
> taiyoko at positiveenergysolar.com> wrote:
>
>> Hi Brian,
>> Thanks for the info. Yes I tested the diode properly.  I was concerned
>> that I needed to test the diode under a load to get a valid test.
>>
>> Taiyoko
>>
>> On Thu, Jul 6, 2017 at 4:14 PM, Brian Mehalic <brian at solarenergy.org>
>> wrote:
>>
>>> Did you use the Diode Test function on the meter?  If the diode is good
>>> you should see around 0.4-0.8 V in the forward bias, and OL in reverse.  If
>>> it is bad (open) you'll get OL in both directions, and if it is shorted
>>> closed you'll get the 0.4-0.8 V reading in both directions.
>>>
>>> Shorted closed would be the failure mode that would indicate an
>>> always-closed diode providing a permanent bypass path and thus a drop of
>>> 25% of voltage per bad diode (or set of paralleled diodes).  (These have 4
>>> diodes right?).
>>>
>>>
>>>
>>>
>>> Brian Mehalic
>>> NABCEP Certified Solar PV Installation Professional™ R031508-59
>>> 520.204.6639 <(520)%20204-6639>
>>>
>>> Solar Energy International
>>> http://www.solarenergy.org
>>>
>>> SEI Professional Services
>>> http://www.seisolarpros.com
>>>
>>>
>>> On Thu, Jul 6, 2017 at 4:31 PM, Taiyoko Sadewic <
>>> taiyoko at positiveenergysolar.com> wrote:
>>>
>>>> Hi Wrenches,
>>>> We were installing Sanyo HIT modules back in 2006-2007 and in 2014 we
>>>> had a rash of bad Sanyo modules. The modules had distinct voltages below
>>>> the good modules ie 50% or 75%.  Sanyo at the time (now Panasonic)
>>>> indicated that it was a bad diodes from a lightning strike not covered by
>>>> warranty.
>>>>
>>>> I finally got around to checking that out. I identified the purportedly
>>>> bad diode in one module (four per module) that was performing at 75% and
>>>> removed it. The diode appears to be fine using an ohm meter.  Is that a
>>>> valid test?
>>>>
>>>> Anyone else have similar findings or experiences with this?  Could
>>>> lightning blow apart the tab ribbons inside of the module?
>>>>
>>>> Thanks
>>>>
>>>> --
>>>> <http://www.PositiveEnergySolar.com>
>>>> Taiyoko Sadewic
>>>> Employee-Owner
>>>> NABCEP™PV Installation Professional
>>>> NABCEP™Technical Sales
>>>> 3209 Richards Lane  |  Santa Fe, NM 87507
>>>> cell  505.570.0137 <505.699.9032>
>>>> Taiyoko at PositiveEnergySolar.com  <Taiyoko at PositiveEnergySolar.com>
>>>> www.PositiveEnergySolar.com
>>>> <http://www.positiveenergysolar.com/>
>>>>   <http://www.facebook.com/positiveenergysolar>
>>>> <https://twitter.com/PositiveESolar>
>>>> <https://plus.google.com/+Positiveenergysolar>
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>>>> <https://www.bcorporation.net/community/sunpower-positive-energy-solar>
>>>>
>>>> <http://www.solarreviews.com/installers/positive-energy-solar-reviews/>
>>>>
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>>
>>
>> --
>> <http://www.PositiveEnergySolar.com>
>> Taiyoko Sadewic
>> Chief Financial Officer | Employee-Owner
>> NABCEP™PV Installation Professional
>> NABCEP™Technical Sales
>> 3209 Richards Lane  |  Santa Fe, NM 87507
>> cell  505.570.0137 <505.699.9032>
>> Taiyoko at PositiveEnergySolar.com  <Taiyoko at PositiveEnergySolar.com>
>> www.PositiveEnergySolar.com
>> <http://www.positiveenergysolar.com/>
>>   <http://www.facebook.com/positiveenergysolar>
>> <https://twitter.com/PositiveESolar>
>> <https://plus.google.com/+Positiveenergysolar>
>> <https://www.youtube.com/user/PositiveEnergySolar>
>> <https://www.positiveenergysolar.com/blog/blog/>
>>   <https://www.positiveenergysolar.com/contact/refer-a-friend/>
>> <https://www.bcorporation.net/community/sunpower-positive-energy-solar>
>> <http://www.solarreviews.com/installers/positive-energy-solar-reviews/>
>>
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-- 
<http://www.PositiveEnergySolar.com>
Taiyoko Sadewic
Chief Financial Officer | Employee-Owner
NABCEP™PV Installation Professional
NABCEP™Technical Sales
3209 Richards Lane  |  Santa Fe, NM 87507
cell  505.570.0137 <505.699.9032>
Taiyoko at PositiveEnergySolar.com  <Taiyoko at PositiveEnergySolar.com>
www.PositiveEnergySolar.com
<http://www.positiveenergysolar.com/>
  <http://www.facebook.com/positiveenergysolar>
<https://twitter.com/PositiveESolar>
<https://plus.google.com/+Positiveenergysolar>
<https://www.youtube.com/user/PositiveEnergySolar>
<https://www.positiveenergysolar.com/blog/blog/>
  <https://www.positiveenergysolar.com/contact/refer-a-friend/>
<https://www.bcorporation.net/community/sunpower-positive-energy-solar>
<http://www.solarreviews.com/installers/positive-energy-solar-reviews/>
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