[RE-wrenches] Sanyo HIT module diode issues

[Taiyoko Sadewic]

Thanks Dave,
We have installed many systems and we only had this problem with Sanyo
modules and we had a rash of these crop up about the same time-frame and
the issue only affected part of the array.  Panasonic denied our claim
because they stated it was a lightning strike. The cause is inconclusive in
my opinion.

Thanks

On Thu, Jul 6, 2017 at 4:25 PM, Dave Angelini Offgrid Solar <
offgridsolar at sti.net> wrote:

> The diode check on a dvm is useful but may not show a diode breaking down
> at higher voltage. Yes lightning can open up the tabs or connecting foil
> inside a solar panel. It can do alot more than that! One of the best
> reasons for using an SPD at the array is also preventing the latent damage
> that can show up later. A really close strike and prayer may help but I
> doubt it :)
>
> Dave Angelini Offgrid Solar
> "we go where powerlines don't"
> http://members.sti.net/offgridsolar/
> e-mail  offgridsolar at sti.net
> text 209 813 0060
>
>
> > 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 Professionalâ„¢ R031508-59
> > 520.204.6639
> >
> > 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
> >> NABCEPâ„¢PV Installation Professional
> >> NABCEPâ„¢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/>
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> >>
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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
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