James ..
You seem to be right.
From some looking around, it seems that the SunPower panels you mentioned are indeed better the most.
Despite the fact that PV cells seem to be around 20%, both from china and from SunPower as per previous link, common PV panels are about 15-16%, in general, and the SunPower panels are indeed better at around 20%.
(I saw 14.5-15.5 % as typical PV panel efficiencies).
I have no idea why I thought most of all panels, rather than the cells, would be at about 20%
I probably looked at published manufacturer (vetted) data from cells, rather than panels.
Mea culpa.
The difference in 16% and 20% efficiency is about 20%.
Ie a 20% efficient panel will produce 20% more than a 16% panel.
This is significant, on a boat with limited capacity.
Otoh..
This is a process industry, with geometric increases in all facets.
So.. my positive conclusion is that other manufacturers will soon increase their efficiencies, to approach and surpass the 20% std.
This is very good news, as it means panels costs will continue to fall at 10-20% rate/w, rather than 5-10%.
Anecdote:
Some may know this, other not so much.
In the US, 5-6 years ago, some credible bloggers noted PV power as insignificant.
(Panel cost was about 3-4$/w).
At that time, US PV production was about zero (under 1 %).
Wind power was about 5%.
Today, us PV production is about 5%, to go to 7-8% this year.
And wind similar, iirc, 7-8%.
Us seems to be around 10GW of PV power, currently.
With 30-40% growth y/yr.
I have no idea of SunPower panels costs.
Most others, are about 0.60/W, here in europe, with 20% VAT paid.
No it is a simply request for you to supply evidence for an absurd statement:
"The majority of PV panels are made in china, these days.The std efficiency these days is around 20%."
-- -hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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