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Thread: inverter output

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    Default inverter output

    if i have a 2kw solar system how many kwh will it output on a nice sunny day roughly.

    thx



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    Quote Originally Posted by boily View Post
    if i have a 2kw solar system how many kwh will it output on a nice sunny day roughly.

    thx

    G'Day Cobber,
    there are too many variables to give a definitive answer. Ask the salesman!

    Kindest Regards, " The Druid ".


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    Hi
    I live in southern Queensland and I have a 1.85KW unit and over the last month I have been averaging 8-9KWH/Day. But as The druid said there are numerous variables. Best is to try to find a nearby neighbour and check his average output and extrapolate to your size system.
    Gordon

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    Here in north QLD from a 1KW system we get about 4KW per day in winter and about 6KW per day from it in summer. The panels are at 90 degrees azimuth on a fairly flat roof so they are not so well optimised for winter.

    The biggest variables are your latitude and panel orientation. If you are getting between 4 to 6 KW for every 1 KW of panels during a sunny day you are doing well.

    I posted some links to graphs for Australian conditions over in this thread.

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    Over the year I get 6kWh /day from a 1.5kW system on the mid north coast.
    Panels heading dead 0 , angle 20.
    We have a lot of rain here.
    This era of thoughtless consumption must end so we can encourage a world of creative geniuses rather than consumer idiots.


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    Unfortunately due to the orientation of my house my panels face almost NE at an angle of 22 degrees. At approximately 3pm at this time of the year output drops to only a few hundred watts from a peak of 12 -14oo depending on the weather. So I LOSE AT LEAST 2 HOURS OF SUNLIGHT A DAY. sO GETTING 8-9kwH'S IS ABOUT ALL i CAN EXPECT AT THIS TIME OF THE YEAR.
    GORDONWH40

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    Regardless of the time of year only the average of the entire year is all that's important , so for every 1KW of panels you will get 4kwh per day averaged over the year.
    There is no such thing as a normal clear sunny day that you can use as a measuring stick because the sun hours , elevation , irradiation , air temperature all change depending on the time of the year , a perfect 22deg day today will produce around 3kwh while in December a 22deg day will produce around 7kwh per kw.

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    Another variable is temperature. The hotter it gets, the less efficient the system becomes. I am on a off grid system and dread 35+ summer days.

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    Quote Originally Posted by wal1 View Post
    ... I am on a off grid system and dread 35+ summer days.
    Stand alone solar? That probably means no aircon?

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    Quote Originally Posted by Joey View Post
    Regardless of the time of year only the average of the entire year is all that's important...
    True, but output on a certain sunny day is also good to know as it gives an idea if a panel has gone dead or if the flying foxes have shat all over them.

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    Quote Originally Posted by boily View Post
    if i have a 2kw solar system how many kwh will it output on a nice sunny day roughly.

    thx
    As beer4life pointed way too many variable - weather, slope of roof, orientation, latitude, nearby trees, type of panels, inverter, dust (or shit) on panels

    I have my Aurora inverter plugged into a computer system which captures every 5 minutes gives graphs and emails me every night to tell me what I made today.

    for some rough numbers
    I have 2kw - I am at 29 degree latitude - kyocera panels facing almost due north.
    My highest ever day was just shy of 14kw - I aim for 10-12 in summer, 6 -7 this time of year 4 -5 in midwinter.

    After the initial burst of minute by minute interest - My main logging is by month now. With best monthly daily average of just over 8kw.

    July 2010 - 177.1 kw
    Aug 2010 - 198.7 kw
    Sep 2010 - 222.5 kw
    Oct 2010 - 250.0 kw
    Nov 2010 - 235.2 kw
    Dec 2010 - 231.4 kw
    Jan 2011 - 204.6 kw
    Feb 2011 - 213.9 kw
    Mar 2011 - 185.9 kw
    Apr 2011 - 160.9 kw
    May 2011 - likey to 145 kw or there abouts

    How October was better than all of summer still has me beat .. but that is the weather factor you cant guesstimate
    Last edited by nfnovice; 30-05-11 at 08:46 AM.
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    Quite variable isnt it and I mean no PUN either.
    I note you went from 231 in December, down to 204 in January and back up to 213 in February which I would have thought that Jan/Feb would be high generator months so either the Sun was too 'High' for the panels or the temperatures affected the panels ability to generate.
    If heat is a reducing factor, what will the effect be on these panels if the reputed Global Warming raises mean temperatures by a few degrees Celcius as forecast over the year ?
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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    I got 49kw in one day during summer, but 30kw a day is typical..


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    Quote Originally Posted by gordon_s1942 View Post
    Quite variable isnt it and I mean no PUN either.
    I note you went from 231 in December, down to 204 in January and back up to 213 in February which I would have thought that Jan/Feb would be high generator months so either the Sun was too 'High' for the panels or the temperatures affected the panels ability to generate.
    If heat is a reducing factor, what will the effect be on these panels if the reputed Global Warming raises mean temperatures by a few degrees Celcius as forecast over the year ?
    Heat is solar panels worst enemy , October , November and early December are about the best producing times of the year , the days are longer , clearer and the peak summer heat hasn't hit yet.
    Towards the end of December into January and Feb the days are long but normally the hottest which greatly effects production , there will be some peak days in between especially if it has rained in the morning and there is high overcast.

    PV panels maximum output is rated at 25deg Max Cell temperature , not air temperature so basically on a 25deg day the cell temp is around 60deg C so already becoming inefficient.
    The perfect day would be around 18deg C in the middle of December with no cloud but these days are rare.
    As a rough gauge on a 35deg day you will loose around 15% above normal system loses , for every degree more you loose around another 1%

    Lowest production times are June , July .

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    Quote Originally Posted by Kirra View Post
    I got 49kw in one day during summer, but 30kw a day is typical..
    49kw is great .. but more detail would be better
    how big a system ?
    what latitude ?

    EDIT : (1 Post) or was that just a fly-by "my systems bigger than yours post" - Freud would have a field day
    Last edited by nfnovice; 31-05-11 at 06:06 PM.
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    Gotta be around 6 - 8 KW for that sort of output Kirra is getting.

    Hey if I had a system that big I'd brag about it too.

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    My system was installed yesterday. Today was the first test. I have 16 panels mounted on ground mount frames, facing directly north at 30deg, it collected power for 9 hours total, in that time it collected 9kw. It was overcast many times during the day. From 10am to 2pm the inverter at the time I was looking was showing a max of 2844watts. Shortly after 2pm even in good daylight with no clouds the power rapidly dropped to under 1000watts, by 2:30pm it was under 200watts.

    The installer told me the panels I got can get good power when the sun is within the 20degree angle from center. At least I can rotate the system and change the angle if I choose to.

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    A new record for my system today in Melbourne.


    Inverter #1 generated 10.80 kw (2.09kw array) SMA3800
    Inverter #2 generated 12.80 kw (2.47kw array) SMA5000TL
    Inverter #3 generated 31.98 kw (4.87kw array) SMA5000TL



    Total generated today......54.8 kw......

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    Hey Kirra, do all those SMA units work independently, just sensing what's on the grid or are they talking to each other via some sort of interface?

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    Quote Originally Posted by SCADA View Post
    Hey Kirra, do all those SMA units work independently, just sensing what's on the grid or are they talking to each other via some sort of interface?
    No software or linking necessary they all just do their own thing.

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