Does Solar Production Reduce Drastically In Winters

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Does Solar Production Reduce Drastically In Winters

Postby rajsarin » Sun Jun 28, 2015 10:31 am

I have recently installed a 6 KW solar panels with 5KW inverter from Euro Solar (end of March 2015)

As the north and the west of my roof is largely taken by pool heating panels I had little choice but to install on the eastern side of my roof.

My peak production hit by my system was 4.8 KW in one day for my 5 minutes otherwise mostly it hovers below the 4 KW mark.

In April we were getting around 20 KW per day, but now in June only around 12 kW per day, is this normal

Any advice would be helpful

Raj
Thanks for reading my post

Regards - Raj
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Re: Does Solar Production Reduce Drastically In Winters

Postby Gordon-Loomberah » Sun Jun 28, 2015 3:20 pm

Welcome to the Energy Matters Forums Rajsarin :)

That's probably a bit short of expectations for an east facing 6kW array in winter. The sun rises in the NE, so it will never be face-on to the array, meaning you are unlikely to see it near 5kW very often at this time of year. In summer when the sun is more face-on in the mornings, you will see higher output (assuming the panels are decent quality), but afternoons will always be poor.
Even so, 12kWh seems rather poor for a sunny day - I had nearly that much from a 2kW array on a tracker on a sunny day in early June (10.8kWh) but I lose 2 hours of sun due to being in a valley. This leads me to suspect you may have some shading, have you checked? Even a TV antenna or power pole across part of a panel can cause a big drop in output.
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Re: Does Solar Production Reduce Drastically In Winters

Postby davidg » Sun Jun 28, 2015 6:07 pm

rajsarin wrote:In April we were getting around 20 KW per day, but now in June only around 12 kW per day, is this normal


For a cheap system and with cheap panels pointing in a far from ideal direction, yes. Time will tell if it was worth getting a cheap system, a considerable portion of the cheap panels "eurosolar" use tend to go "brown" within a few years.

To make system worthwhile, I sure hope you were not sold on the FIT income. If so you will be sorely disappointed. Grid connected solar without battery storage is all about being able to use the power while it's being produced, it cannot be "banked" for use later.
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Re: Does Solar Production Reduce Drastically In Winters

Postby Gordon-Loomberah » Sun Jun 28, 2015 6:45 pm

I wrote: I had nearly that much from a 2kW array on a tracker on a sunny day in early June (10.8kWh) but I lose 2 hours of sun due to being in a valley.


Just checked the log book, and it was actually 10.9kWh on the Solstice, 22nd June. On 2nd June I had 11.5kWh from the 2kW array, so yeah, 12kW from a 6kW array does seem a bit feeble.
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Re: Does Solar Production Reduce Drastically In Winters

Postby Windaroo Resort » Tue Jun 30, 2015 6:40 am

Hi Raj

I am a few kilometres to the south of you with 5.5 kw of panels with a 5kw sunnyboy inverter. My array faces west with shading occurring starting at 2pm (stupid gum trees). On a full sunny winters day I get about 15kwh and in summer about 32. Just a bit of a comparison for you since we are so close. Here is a graph of mine on a sunny winter's day http://pvoutput.org/intraday.jsp?id=26925&sid=24628&dt=20150621&gs=0&m=0
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Re: Does Solar Production Reduce Drastically In Winters

Postby Tracker » Tue Jun 30, 2015 7:56 am

In Sydney with north facing, I get near the same in winter..

I would wonder of there is some other aspect holding you downother than east.. eg. Trees stopping early sun.

Clearly you should be looking at IF you can move panels somewhere.. eg.. west.
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