[RE-wrenches] Ten K Solar

[William Dorsett]

1. Too much reflected light onto the array in the old Carrizo Solar caused
the acidic acid in modules' encapsulant to turn brown, reducing production
to the point that the whole field was scrapped after I don't know how many
years of service. But I would wonder if similar problems might occur with
these...especially in very hot locations in the summer. Otherwise, I think
that a smaller ratio of reflected light has been a neglected and cheap route
for increasing array output ("energy density"). 

2. Microinverters operate with MPPT from relatively low voltage modules, so
that is not especially new. Tho did I read MPPT at the cell level? That
would be new.

Bill Dorsett
Sunwrights
Manhattan, KS

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Monday, October 22, 2012 1:26 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Ten K Solar

Colleagues:

The statement below is substantially true and is the skeleton in the closet
for the PV industry.  Smart combiners and automatic roof-top fault
disconnecting means will correct this problem.

William



At 08:22 AM 10/22/2012, you wrote:
>Reading their statements make me wonder - "A traditional solar system 
>produces a substantial live current any time that it receives 
>sunlight-with DC voltages in the 300VDC-600VDC range-and cannot be 
>fused. Experts have said for years the only way to have a safe system 
>is for it to operate at low voltages (<80V)."

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