One important question to ask your panel maker if you think you will have a lot of shading on your panels (boat mast?). Is the number of bypass diodes. Two is pretty common. Avoid strings if you can and you avoid one panel bringing the whole string down. Though that would increase wire cost in having more parallel runs. Or you can use the newer optimizers/micro inverters the cost per panel really only works on the larger panels 300 watts and such. My main reason to go with flexible panels was weight I was adding a lot of panels and they where very high up. And I need to keep my boat fairly sea worthy. If you do add a lot of weight high up also add more weight low to counter it out. Provided you will ever be in rough seas.
On Jun 18, 2014, at 10:33 AM, "Dominic Amann dominic.amann@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
Gentlemen, thank you.I recognize your enthusiasm and commitment to clean solar energy, and I share your desire to use only the most efficient cells considering that boats have very limited space for deployment.Thank you for raising the issue, the discussion has jogged me into doing some basic research myself.Firstly, I am only concerned about the whole panel. I don't care what the cell efficiency is if it doesn't translate into panel efficiency. I do see that SunPower lead the pack in cell and power efficiency these days. I also see that Sanyo are in the top tier with their panels. This could be the effect of their hybrid technology which performs better at high temperatures.So - in actual practice, it may come down to a combination of factors rather than which measure the highest efficiency in the laboratory. Are you mostly in cloudy conditions or do you get a lot of full sun? What are your temperature curves like? How does the panel perform if a shadow falls across its middle? Are you willing to pay a significant premium for a conditional performance improvement? That may depend on your local conditions.Then there are non-traditional ways of using solar. There are new flexible and translucent panels. These could possibly be stitched into dodgers, bimini covers or even sails - but they would be lower efficiency types - but not as awkward or intrusive as standard panels which require precious horizontal space.On Tue, Jun 17, 2014 at 3:28 AM, James Sizemore yamez4u@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
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%."
I am simply asked you to find a single link to a single Chinese Panel that is 20% efficient that does not use SunPower cells. Who knows you might even be able to find one or two. I am not asking you to prove that the "standard" Chinese panels is 20% efficient. Which is what you claimed.The average US and Japanese panels are not that efficient. Only the very high end of the consumer panels are in that range, with a price premium on them for being the top of the line in efficiency.If there are sooooooo many Chinese 20% efficient panels out there it should only take you a few minutes? Please enlighten the group. Boats have very limited space for panels it would be incredibly useful, to have this list of 20% efficient cheap Chinese panels.I will start the list off with two companies that make panels with SunPower Cells that are 20% efficient and are reasonably priced:Now your turn you just need to find one panel......One little panel. You CAN DO IT!On Jun 12, 2014, at 1:57 AM, Hannu Venermo gcode.fi@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:The majority of PV panels are made in china, these days.
The std efficiency these days is around 20%.--Where there is a shell, there is a way...Dominic Amann
M 416-270-4587
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Posted by: James Sizemore <yamez4u@gmail.com>
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