Paul Bradford
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« on: September 30, 2011, 06:05:43 PM » |
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Hi All,
Our system went live late on Monday afternoon, 26th September. This week has been sunny throughout the day (we live in SW France). I have noticed that the highest reading (that I have seen) on the inverter has been just over 1000w. We have 16 x 250w panels (4kw total) Our roof pitch is between 32-35 degrees and faces due south. Because of a hill to the east our inverter doesn't show a reading until around 0830hrs (0730hrs GMT). We had a reading of 2.7kw for the first day and have a total now (it won't get much higher tonight) of just over 29kw. Around 6-7 kw per day. It seems to me a lot less than what I had expected.
Paul
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« Last Edit: September 30, 2011, 07:36:31 PM by Paul Bradford »
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rondurrans
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« Reply #1 on: September 30, 2011, 06:27:58 PM » |
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Crikey Paul your post is a bit worrying ... if you say in the sunshine all you have peaked is 1000 Watts then you clearly have a problem - I think the other values you show 29 kWh (kilowatt hours) is very low for your latitude as generated (with a shaded array) over 9.9kWh per day and I am sure some of the guys posting online now and soon will be showing in excess of 13-15 kWh per day for Sept.
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« Last Edit: September 30, 2011, 06:37:07 PM by rondurrans »
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iantowil
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« Reply #2 on: September 30, 2011, 06:52:27 PM » |
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Best day for my 4KWp system in the last week is 19.7KWh - roof angle shallow at 20degrees so the guys at 35-40degrees will have done abit better. Think you have a problem Paul - get the installers back!
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Jober
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« Reply #3 on: September 30, 2011, 07:01:30 PM » |
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Yes, sounds worrying. Did you have sunshine all day? Ours in the last few days of wall to wall hazy sunshine was approx 22kWh.
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Sharp 235NU x 17 = 3.99kWp, SB4000TL, Littlehampton, Lat - 50.8069, South
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Paul Bradford
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« Reply #4 on: September 30, 2011, 07:31:37 PM » |
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Hi Guys,
Thank you for the replies. I will get them back as I thought we were lacking somewhat. Sunshine all day with highs of 28c. That has been the norm for the past five days.
Paul
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« Last Edit: September 30, 2011, 07:35:43 PM by Paul Bradford »
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GavinA
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« Reply #5 on: September 30, 2011, 08:11:06 PM » |
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I'd hazard a guess at one string of the panels being either not connected, or having it's polarities reversed, so that only half the system is working.
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at home | 80 tubes, 2 tanks direct PV powered SWH + 5 x Yingli 185Wp solar PV panels.
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Paul Bradford
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« Reply #6 on: October 05, 2011, 01:07:04 PM » |
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Hi Guys,
Just to let you know what has happened so far. I visited someone in a local village that has a 3kw supply on a Southwest facing roof. She obtains about 9kWh per day. She was told to expect a production of 1800kWh per year and has achieved 2000kWh and is quite happy. Armed with this and the information that you all had supplied, I eventually spoke to a technician yesterday morning who tried to tell me that the levels will depend upon the levels of sunshine. I agreed but told him that we had an excellent week weather wise and told him what I had gleaned from this site and the visit to another house. He called back at lunchtime and asked for another reading from the inverter. He was surprised when I gave him the figure and thought that I must be mistaken as he asked me to repeat it. He arrived with 30 minutes. As we have the panels grouped in one of 12 the other 4 on two separate sections of the roof, he thought that it might be a question of the panels not being balanced, ie not fitted as two groups of 8. I don't know whether this would have any effect or not, perhaps you guy do.
Anyway, having taken the lid off the main switch, he initially found one cable loose in the connector, not even screwed in. He fixed that and checked the other connections, finding another wire almost out of the connector due to a broken screw. He tightened it as best he could (a replacement part requires ordering.) and switched back on. My reading immediately doubled to 1750+w. Following a misty start today, with the sun not breaking through until lunchtime I noticed the highest reading so far a short while ago of 2354w and production so far today of 5.5kWh. It's looking good so far but i will keep an eye on it. The technician did state that we might lose a bit until we have a better connection.
Thanks for your input.
Paul
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iantowil
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« Reply #7 on: October 05, 2011, 10:03:18 PM » |
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Paul, I had my system installed a few months back. It was finished quite late evening so the installer come the next day to do all the configuration and checks - it sounds as if that step was completely missed with yours. Personally I wouldn't leave it at them just coming out to put it right - and even that took some persuasion! Not trying to stir, but worth making them sweat abit at least.
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GavinA
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« Reply #8 on: October 07, 2011, 12:44:04 AM » |
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I'd hazard a guess at one string of the panels being either not connected, or having it's polarities reversed, so that only half the system is working.
bingo. |
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at home | 80 tubes, 2 tanks direct PV powered SWH + 5 x Yingli 185Wp solar PV panels.
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