Second net FIT system – maybe hybrid down the track.....

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Re: Second net FIT system – maybe hybrid down the track.....

Postby Tracker » Sat Apr 26, 2014 8:32 am

brucedownunder wrote:..... I've a 1050 system on my garage roof, and I have seen regularly 70 watts and less on the inverter lcd , during the time of shading ......... I've also got another 1050 watt system ready to add,but on a unshaded area. ....... I'm not game to ask origin if I can add.......


In practical terms, you are moving the system... the issue is that there WILL be a significant change in production.
Hence that change may be "noticed", and thus you will need to be ready to say... "it was moved from shade to sun"... ;) ;)
..
.
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Re: Second net FIT system – maybe hybrid down the track.....

Postby davidg » Sun Apr 27, 2014 9:12 am

Tracker wrote:SHADE.. Poison for Power..Don't leave a twig standing... :o
.

you did read the trees are on council land ? I would imagine the trees were there first which rather limits your options, there have been a number of wins for solar where it was there first recently in respect to shading Mainly In relation to building planning permits however the fact that this has been finally recognised by some has set the precedent for PV and access to sunlight I would imagine that vegetation will go the same way - first in best dressed :D

That's why I suggested AC mico inverters as you know tracker one per panel so each panel will produce what it can at any given time - no strings persay :)
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Re: Second net FIT system – maybe hybrid down the track.....

Postby Tracker » Sun Apr 27, 2014 9:34 am

.
David.. points noted .. but I have seen situations where Councils have acted sympathetically to requests for better sun light..
They do take it into consideration in developments..

As for micros ...
I will likely go to my grave, thinking that Mr. KISS was right with his principle ..
I also suspect that with such diverse dapple shade, even micros will be totally unfinancial.
( caveat being... we are not aware of the complete day's sun exposure)
..
.
Retired Engineer and keen PV experimenter - Always ready to learn and share.
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Governments won't save the world :-) They will just TAX it :-(
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Re: Second net FIT system – maybe hybrid down the track.....

Postby Firegirl » Sun Apr 27, 2014 5:48 pm

Some friends on a farm near us recently put in a 5kW grid-feed ground-mounted system, all micros. (They use more power than us and must have A LOT more to spend .....).
With the little inverters attached behind each panel, all connected on a couple of AC daisy chains, then a 200m run to the meter box on the house, it is certainly a very elegant and from a wiring point of view, simple system. The inverters have a 25 year warranty, I think (time will tell :? ). Property is heavily treed and the location was the best available but still had a single large tree which cast a moving shadow across the system all afternoon. Fascinating to watch the output of each panel drop (monitored over the net) as the shadow moved across, output of unshaded panels unaffected. Shame, the tree had to be removed a few months later....must have been hit by lightning they reckoned! :idea:
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Re: Second net FIT system – maybe hybrid down the track.....

Postby Firegirl » Sun May 25, 2014 2:37 pm

Hi again,
Thanks to all for comments and discussion. It was very useful.
Well, our second little net system has been installed. We found a good local CEC accredited installer to supply and fit the panels, wiring etc and also organise the metering at a very reasonable cost. Very pleased with his service and communication. The lowest row of panels does overhang a tiny bit at their upper corners, but HWMBO is now happy after some initial grumbling!
1.2kw array.jpg

We had a cloudless day this week, and I logged the performance of the two systems every half hour (just manual reads from inverter display), with interesting (at least to me) results:
performance may22.JPG

As expected the original 1.5kw gross-metered system with NE orientation ( 12 deg elevation) peaked late morning, while the new 1.2kw net metered system with NW orientation (45 deg elevation) peaked early afternoon. The peaks were not much different, presumably the greater elevation of the new system at this time of the year more or less made up for the smaller capacity.

The “gap” in production of the net system mid morning is due to a faint shadow from trees in the council reserve sweeping across the panels. It may have also just touched the gross system above (but was not visible at all) at the same time, perhaps another reason why its peak was not much greater than the smaller system. A good demonstration of the bad effects of even minimal shading. The precipitous drop from the net system after 2.30 pm is also due to shade, this time heavy shading from neighbour’s tree creeping across. After about 3.30pm this time of year we totally lose the sun anyway behind a solid wall of houses, trees and hillside.

Interesting that in the middle of the day the voltages for the two systems are almost identical. They do each have the same total number of cells. The gross system has 8 X 54 = 432 150mm poly cells, the net system has 6 X 72 = 432 125mm mono cells. Any comments? In particular any ideas on how such apparently dissimilar arrays might perform in parallel on a single MPPT?? (just curious)

We will probably just sit back and observe over the next year or two the developments and costs of hybrid technology to decide whether we will go down that route after 2016.

Cheers and thanks, Leslie Anne
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Re: Second net FIT system – maybe hybrid down the track.....

Postby Tracker » Mon May 26, 2014 11:33 am

..
Thanks for giving us an update..

That all looks great..

One the general subject of TREES, people should not be afraid to approach Council, to see if something can be done..
PV is a very green and worthy community asset..

I know where one Council removed trees completely.. to give solar access for PV.... :D
..
.
Retired Engineer and keen PV experimenter - Always ready to learn and share.
2 x CMS2000 (fan cooled) GCI and SE 170W panels
1.7kW First Solar/Outback Island circuit - Peak Replacement Power
Governments won't save the world :-) They will just TAX it :-(
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