#137889  by rawill
 Thu Feb 15, 2018 9:34 am
I have been looking to add more solar, and looking on the web for information on the relative advantage/disadvantage of poly against mono panels.

So far it seems some say not much difference in output, more important is build quality.
However, I thought I had read that poly panels drop off their performance more quickly than mono. That is as they age they lose performance capacity.
Though I read that some mono panels only guarantee 80% performance after 10 years.

I see one forumite has added a poly panel to the mono panel array.
I wonder how this has worked out long term.

Can anyone add to this?
 #137890  by scubadoo
 Thu Feb 15, 2018 10:15 am
rawill wrote:
Thu Feb 15, 2018 9:34 am
... I see one forumite has added a poly panel to the mono panel array...
That could be me?
I chose the additional poly panel purely based on convenience at the time. We were in Christchurch and our usual AA supplier's freight charge was just a little expensive so I checked Trademe and found a local new 270W poly panel for just $250.
It has only been on the roof for a few months and so far it actually slightly outperforms the two similarly rated mono panels. The 3 year age gap could be relevant?

Our new panel - http://www.renesola.com/product/Solar/S ... 205Busbar/
 #137893  by Karmann57
 Thu Feb 15, 2018 11:42 am
Hi Scubadoo, can you edit your reply to clarify your poly v mono panels. i.e. were your existing panels Mono and the new panel Poly or vice versa ?
 #137894  by scubadoo
 Thu Feb 15, 2018 11:54 am
Sorry Karmann57

Edited for clarity. Original panels are mono. :oops:
 #137895  by rawill
 Thu Feb 15, 2018 11:56 am
scubadoo wrote:
Thu Feb 15, 2018 10:15 am
I checked Trademe and found a local new 270W poly panel for just $250.
That was a very very good price.
Best I have for one of these panels is $375.00 for 260 watts. (poly)
AA solar can do me a 270 watt panel for $305.00 delivered to Invercargill (mono)
 #137896  by scubadoo
 Thu Feb 15, 2018 12:05 pm
I think the Christchurch guy had ordered a few too many panels for his roof. I'm guessing he already had about 50 panels on his roof when we collected ours. :o
I would definitely go for the AA Solar deal Robin. That is a better price than I could negotiate at the time.
 #138164  by rawill
 Sat Feb 24, 2018 7:11 am
Yes Neville, it was you I was quoting! But did not want to mention you by name!
In the end, inspite of the good deal offered by AA Solar, I went with the local supplier and got a poly 265 watt panel for $340.00.
Reasoning was local backup, after having had warranty issues with another supplier a few years ago.

They did not standby their product and said it was my fault as it was incorrectly mounted.
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