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From: KevinJ93 <kevin_es@whitedigs.com>
Newsgroups: sci.electronics.design
Subject: Re: Solar panels
Date: Fri, 31 May 2024 18:31:54 -0700
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On 5/31/24 1:50 PM, Don Y wrote:
> On 5/31/2024 1:43 PM, Don Y wrote:
>> On 5/31/2024 12:56 PM, KevinJ93 wrote:
>>> On 5/30/24 10:00 PM, Don Y wrote:
>>>> But, the individual wafers (on a panel) are probably wired in a
>>>> series-parallel configuration with a nominal 48VDC output.
>>>
>>> Not usually true - I don't know of any panels where there is a 
>>> series-parallel configuration. As wafer sizes increase the panel 
>>> current increases.
>>
>> I count ~72 wafers on a panel I have here.  How does *it* get to a 48V
>> nominal output?

I don't think it is 48V nominal output - it is probably 48V open-circuit 
with a maximum power voltage of ~41V.

> Ah!  Each *wafer* is a *single* PV cell?  The metalization layers led me
> to think each was *three* cells (~2V output) series connected.

I don't think they do that - normally they use the substrate connection 
from the back as one of the terminals - putting multiple cells on a 
wafer would be more difficult requiring some form of device isolation as 
is used in integrated circuits. The metalization on the front forms the 
current collector for the front contact.

kw