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rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245
Posted: 02:10am 07 Mar 2011
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finally got my new sharp panels swapped over
the panels are 11 x 185wat sharp NU-185A1H units (total 2035W)
temperature 25deg time 12:30pm full full sun (no cloud)
the units at first switch on was 1300 watts then crept up to 1750 over 3-4 minutes
had a look just then 1:00pm and the peak for the day has only been 1776 watts
considering they are new dust free panels,25 deg day, windy, no clouds....
for a 2035 watt PV system allowing for the derating factors would i a expect a little more?
my old sharp panels had a peak of 2764 watts (on a cloudy edge effect day)
rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245
Posted: 02:24am 07 Mar 2011
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just had a look at http://www.digivation.com.au/solar/tempderate.php
and it said at 25deg i would lose around 300 watts on temp derating... does this look correct?
(sorry for the formatting)
Variables
NOCT °C Cell temp @ 800mW and 20°C ambient, typically 45°C
Pmax/°C %Coefficient for max Power varying with temp, -0.48% for mono/poly, -0.20% for amorphous
Ambient Temp°C
Incident Irradiation mW⁄m² Incident irradiation is about 1000mW⁄m² in summer when the sun is overhead
System Size Wp
Results
Mono/Poly Amorphous Difference
Cell Temp 56.25°C 56.25°C 0°C
Derating factor 15% 6.25% 8.75%
Lost capacity due to temp 305.25W 127.1875W 178.0625W
mid north Matt Regular Member Joined: 06/01/2011 Location: AustraliaPosts: 58
Posted: 08:36am 07 Mar 2011
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put the hose over them for awhile and see what the peak is than.they like to be coolPt Wakefield Matt
rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245
Posted: 09:15am 07 Mar 2011
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hi Matt, yes i tried a hose down, simulated a light rain shower, squirted nice and high to get a simulated rain shower, hosed them for 1 minute. The highest reading i noted was around 1876watts so a small increase....
will just keep an eye on them over the next few days/weeks and monitor the output.
brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548
Posted: 09:49am 07 Mar 2011
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First, Richard , I'm sorry for you ,(known this guy for 10+years) ...
The salesman is not to fault ,,he's been brainwashed by selling experts, and remember they have to sell solar panels , otherwise they don't feed the family!!
Remember I told you about a neighbour that was "conned" into 2.5 Kw of panels . And remember taht I told you at switch on he got 1070 watts , yes 1070 watts .
Well the salesman was way gone by this time --- Clear day , midday , yep another sucker. came home to my 1Kw and it was reading 340 watts (bit of shading from that tree) ,, ..
Solution ,, have a look at RossW postings ,, he and perth Pete are the only 2 guys that had had success , but at their own installation methods..
best of luck Richard ..
BruceBushboy
RossW Guru Joined: 25/02/2006 Location: AustraliaPosts: 495
Posted: 10:05am 07 Mar 2011
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Ahhhh..... experts hey? What can I say....
Today, not withstanding the general smoke haze from fuel-reduction burns and some high cloud, I "only" managed 2.92kW peak from my 3.4kW arrays. I harvested a mere 20.9 kWh of power but after putting 210 amphours back into my 48V array, I spent 4.5 hours in float.
This whole government ripoff of FORCING people to let un-trained, un-knowledgable idots sign off on installations they don't understand is..... well, it's just vandalism (at best!)
rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245
Posted: 10:10am 07 Mar 2011
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un-knowledgable idots (idiots) ?
hope that's not a stick pointed at me?
brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548
Posted: 10:30am 07 Mar 2011
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Oh , I'd never think Ross would imply that ,Richard .,, he's most likely directing his comment to those who either sell or commisssion the installs.
The bunch of jackals that bounced around my roof were straight from the local backpackers shack. The "boss" man was a sort of electrician that spent most of his time re-lighting his roll-yer-own's..
BruceBushboy
mid north Matt Regular Member Joined: 06/01/2011 Location: AustraliaPosts: 58
Posted: 12:34pm 07 Mar 2011
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so how come the idiots are issued with a installers licience?is it a w/worths licience?i thought you had to pass test etc to get one of those and been in the trade awhile.surely they have account for their mistates or design flaws and be held accountable otherwise its another sh*te sceem like the insulation sceem.im booked in to get a 1.5kw system though nu energy for zero dollas other than pay a local sparky $320 to change the meter over but im seriously thinking of phoneing them to cancel it,as there only suppling chinga panels and old model inverters instead of the latest transformless inverters,the other reason is im getting divorced and have give half of everything to her including what i owned before marriage which was nearly everything Pt Wakefield Matt
brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548
Posted: 10:16pm 07 Mar 2011
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Sorry about your divorce Matt,,, been there done that ....
Look at it this way ,, $320 she gets $160 you get all the rest for $160 . When you sell the house take the panels off and other gear and store it ...
Now, for $160 you just bought yourself a 1.5 Kw system ,I'll buy it off you !!!. For a lot more than that, fair dinkum ..
Mine cost $355 for 1Kw ,, so you are really lucky ,, no worries about the 'chink" stuff , it will be covered by guarantee ,or you can repair it yourself with help from the forum crew.
All the best
BruceEdited by brucedownunder2 2011-03-09Bushboy
RossW Guru Joined: 25/02/2006 Location: AustraliaPosts: 495
Posted: 10:58pm 07 Mar 2011
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Good questions. I know several people who are more than capable of this work, have paid their fees to get accredited, passed their exams (97%), only to be told that because they are not an active sparkie, they don't get the accreditation. Meanwhile, other people I've seen who don't know even the bare basics are getting through. It's just another bloody scam, much like the insulation scam. Sure, not *EVERYONE* installing falls in this category, but a great many do.
My rant in another thread however is bang on the money. Prices of panels and inverters went up. Price of installation is way over the top. Restrictions (like can't add to an existing system, must be grid-connected, can't use any parts of the installation that dont have the governments tick on them, can't install any of it yourself etc etc) are just ways to bleed out as much of the money as they can.
I'm some 240 metres from the mains - but can't get connected (well, I could if I spent an estimated $100,000 just to get through the "environment protection" area), so don't qualify for grid-connected incentives, and because I'm within 3km of power I don't qualify for off-grid incentives..... etc etc etc.
Still, it was FAR cheaper for me to buy and import my own gear and install it myself, than any of the "government assistance" plans quoted me. Why? Because of all the cream being ripped off my all the middle men. And I can do with it what I damn well like. Trackers, experimenting, logging. I can pull it all down and sell it tomorrow - without some petty politician getting in my face about it.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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