Re: Solar panels

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