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793 posts

Ultimate Geek
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Topic # 247798 23-Feb-2019 19:41
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Is there any public database that shows the solar installs for sites in NZ?

 

Just wanting to see what one should be getting in terms of kWh per day/year vs online calculators.


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  Reply # 2186030 23-Feb-2019 19:52
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You can see mine here, there may be others on enlighten that are shared but I cant seem to find any index or map of them.

 

 





Richard rich.ms



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Ultimate Geek
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  Reply # 2186036 23-Feb-2019 20:04
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Ok, pity if there doesn't seem to be one.  Yours doesn't state the array size, nor tilt angle?  I guess it was pretty cloudy today!


 
 
 
 


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  Reply # 2186057 23-Feb-2019 20:39
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Tilt angle also affects seasonal production. Is having more output during winter worthwhile for you? Is summer output preferable?

And you also need to consider, will your panels face to true north? Otherwise how far off, and towards East or West? Do you want to bias output towards morning or afternoon?





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Master Geek
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  Reply # 2186063 23-Feb-2019 20:53
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richms:

 

You can see mine here, there may be others on enlighten that are shared but I cant seem to find any index or map of them.

 

 

You can find them here: https://enphase.com/en-us/map


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  Reply # 2186064 23-Feb-2019 20:55
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gchiu:

 

Ok, pity if there doesn't seem to be one.  Yours doesn't state the array size, nor tilt angle?  I guess it was pretty cloudy today!

 

 

They are at 45° angle, not sure why it doesnt tell you the panel details on the public page. I can see them as JAP6-60-260/3BB JA Solar which I think means theyre 260 watt ones. When they hit their peak there is a tiny flat on the output but it never seems to get there, max for the whole lot seems to be 2kw over a large amount of the year.

 

The reason for slightly undersizing the inverters is that the grid connection is usually the limiting factor and they just add up all the inverters to get the generation capacity, with no damn about the panel angles or size etc. That is why with panels facing several directions you can get more out of a string inverter and optimizers, since they look at the inverer size for that, not all the panels, and since panels facing different ways will not hit their peak at the same times can be way more panels than inverter.





Richard rich.ms



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Ultimate Geek
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  Reply # 2186066 23-Feb-2019 21:09
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Some of these are determined by roof geometry so one can't optimize as one would like.

 

I have had a couple of systems installed recently

 

http://www.solax-portal.com/dz/home/overview/251915

 

Location: Wellington, Karori
Installer: Mercury Solar
Size: 3.05 kW
Brand: Trina Honey 305
Rated: 305W x 10
Azimuth: 45 deg (NE)
Tilt: 20 deg (flat on roof)
Battery: 13.5 kWh (Tesla Powerwall 2)
Chemistry: Lithium
Inverter: Solax X1 Boost 5kW

 

http://www.solax-portal.com/dz/home/overview/251915

 

Location: Wellington, Karori
Installer: Greenspark Solar
Size: 3.6 kW
Brand: Duomax Plus
Rated: 300W x 12
Azimuth: 45 deg (NE)
Tilt: 30 deg
Battery: 14.4 kWh (shared)
Chemistry: Lead Carbon
Inverter: Solax SKSU5000

 

http://www.solax-portal.com/dz/home/overview/255503

 

Location: Wellington, Karori
Installer: Greenspark Solar
Size: 2.4 kW
Brand: Duomax Plus
Rated: 300W x 8
Azimuth: 45 deg (NE)
Tilt: 30 deg
Battery: 14.4 kWh (shared)
Chemistry: Lead Carbon
Inverter: Solax SKSU5000

 

The second two are in an array of 20 panels split into two strings of 12 and 8 panels, and the battery bank is shared between the two houses.  There's some shadowing of the panels on each other which needs to be rectified.


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  Reply # 2186068 23-Feb-2019 21:27
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Fix that shadowing. Even a small amount of shadowing on 1 panel, causes a big reduction in power output on the whole system







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Ultimate Geek
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  Reply # 2186074 23-Feb-2019 21:54
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Yes, 12 panels are in shadow from each other until about 9:30.  This means that those panels don't start producing significantly until 2.5 hours after the first 8 panels.  However, 80% of the power is produced in the +/- 2 hours around solar noon.  I'm waiting for the installers to come back and fix the shadowing.




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  Reply # 2186204 24-Feb-2019 10:01
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RmACK:

 

You can find them here: https://enphase.com/en-us/map

 

 

 

 

That shows Enphase installations but does it also show which ones are public?  I tried clicking on one near me but nothing happened.


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  Reply # 2186215 24-Feb-2019 10:31
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I use SolarEdge to monitor my solar production, consumption, etc.  They provide this https://monitoringpublic.solaredge.com/solaredge-web/p/home/public?locale=en_GBto show those people who have made their information public.

 

 

 

 




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Ultimate Geek
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  Reply # 2186254 24-Feb-2019 12:01
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Interesting.  29 public installs in NZ, and only one in the Wellington region being in Lower Hutt.


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  Reply # 2186949 25-Feb-2019 15:04
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I have an Enphase install and live in Karori.

 

I didn't know you could make data public, let alone how to do it. Its not something Installers appear to go out of their way to tell you.

 

A quick Google tells me I need something called Enphase Enlighten and need to contact my installer for it.

 

 

 

 




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Ultimate Geek
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  Reply # 2187185 26-Feb-2019 08:25
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Peter, let us know when your system becomes public.  It'll be interesting to compare.


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  Reply # 2187190 26-Feb-2019 08:39
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gchiu:

 

Peter, let us know when your system becomes public.  It'll be interesting to compare.

 

 

I was thinking the same thing gchiu when I had a look at your three installs via the links you posted.

 

As a FYI, I've got a 4KW system that due to (I think) the micro inverters maxes out at 3.85KW in full sunlight.  So far this year, its generated 573 kwh in Feb and 785 kwh in January.  My system is on a roof with a 20 degree slope, and faces almost exactly north.

 

 




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Ultimate Geek
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  Reply # 2187196 26-Feb-2019 08:52
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Your system sounds ideal, and mine is somewhat lacking!  Using the NREL calculator for me facing North-East I'd be better off at 23 deg tilt instead of 30 deg.


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