Solar PV Performance Thread - Post your monthly output

DrPhilG

https://www.boards.ie/discussion/comment/117853066#Comment_117853066

I'd have to dig back through bills and it was a different provider too.

I will if I get a chance!

DrPhilG

Found it...

2019 period:

Bought 535 day & 692 night

2020 period (solar installed midway):

Bought 462 day & 472 night

Generated 572kWh, exported 147kWh

2021 period:

Bought 69 day & 199 night

Generated 1237kWh, exported 170kWh

harderthanf

August

Total: 792.20kWh

Highest day: 40.062kWh , 7th

Lowest day: 8.031kWh, 20th.

6.8kW setup, South facing. South East.

Decent month for month. Already September is terrible!

Bobeagleburger

August

Total: 602kWh

Highest: 32.3kWh , Aug 11th

Lowest: 5.1kWh, Aug 14th.

5.7kwp SSW, Galway.

Manic Moran

Another really bizarre month, where we didn't break 38C. This means that compared to last year, demand was less (though there were a couple of days where the aircon broke and was constant) and equally solar generation was obscured by cloud. Compared to last year, though, the amount taken from the grid was much better. (Solar install was late March).

Overall, the figures for the 11.5kWh system were as follows, which was rather disappointing.

When installed, the calculations were that somewhere between 65-70% of the summer electricity needs would be met by solar, the actual figure for this month was 56%. Max daily production in the summer is 10% less than it was in spring on a (rare) cloudless day, even though the day is a bit longer. As near as I can tell, it's because the sun is so close to directly overhead that it does not hit the panels as at good an angle, peak production was 7.8kWh, giving 68% efficiency. In winter, the sun is at a lower angle and hits the panels more directly.

bullit_dodger

Maybe the temperature could be playing a part here too? Typically panels have a best operating temperature of about 25C. Course with them being generally painted black even if the day's air temperature is 38C, your panel might be at 60C (more?) in direct sunlight. Some installs even have little coolers to keep them chilled. Definitely don't spray the garden hose on them anyway as you might crack the glass :-)

I saw somewhere that 0.5% drop off in efficiency for every 1C above the optimal temp for your panel. Different panels will have different optimal temps, but I guess they'll all be around that 25C-30 range.

Your right that the angle of incidence will matter, but August had the same inclination of the sun as would late April/early may, so maybe not angle then?

bullit_dodger

Did a bit of digging for you.

How Temperature Affects Solar Panel Efficiency (renvu.com)

slave1

Well that was a pretty gloomy month

Midlands

4.1kWp SW, 3.3kWp NE

522kW imported

376kWh Generated

328kWh consumed

213kWh to Eddi

0kWh to Zappi

Highest was 7th, 25.7kWh

Lowest was 5th, 5.3kWh

39% self sufficient for month

Monthly cash saving based on average daily load and all non-load items like dishwasher/washing machine/immersion at night rate, €47.57

denismc

2.08 kWp, south facing, Cork

150 kWh generated, only 109 kWh consumed, that's both with an E.V and diverter.

April has been the best month of year for me with 274 kWh generated

MAULBROOK

https://www.boards.ie/discussion/comment/117690261#Comment_117690261

https://www.boards.ie/discussion/comment/117690261#Comment_117690261

SE Wexford 6.2Kw, 10.5 Kw battery

Sep Total 499.1kw

Best day 7th 30.5Kw

Worst day 8th 6Kw

Imported 22.9kw (started charging the battery on night rate)

Consumed 435.3kw

Exported 91.5kw

Total Generation since June 2019 13.61MWh

DennisZ

First full month. 2.6kwp facing SSE, Dublin.

Generated 217k

Consumed 163k

Exported 54k

Imported 456k

Zappi 93k

Best 29th - 13.6kwh

Worst 30th - 2kwh

kabakuyu

Dismal month, 2.5 kwp south facing Galway.

Total was 191.3kwh.

Best day was 23rd at 14.1kwh.

worst day was today at just 1kwh.

Total since install on 11th May is now 1,380 kwh.

On 16 days I did not exceed 5.5kwh and the average for those 16 days was approx 3.6 kwh per day.😮

SD_DRACULA

S Dublin 7Kwp, 5 Kwh battery

Total 484kw

Best 7th 32.6Kw

Worst 12th 6.4Kw

Imported 113kw

Consumed 552kw

Exported 57kw

EV 91.2kw

Self use 88%

Solar - Grid use 80% - 20%

Total Gen since May 2021 - 3761kw

garo

https://www.boards.ie/discussion/comment/117830140#Comment_117830140

4.8kW EW Dublin. 2.4kWh battery

September 2021(kWh):

Production: 446.5 (462 predicted)

Consumption: 788

Import: 461 (157d, 304n)

Export: 25.9 (92.6 pred.)

Best day: 6th: 19.3

Worst day:30th: 4.3

Bobeagleburger

September

Total: 391kWh

Highest: 28.7kWh , Sep 23rd

Lowest: 4.2kWh, Sep 18th.

5.7kwp SSW, Galway

tails_naf

September Stats

6.4kWp (4.5 SSE, 1.9 WSW) , 4.8kWh battery, Eddi, dumb electric car charger – Tipperary

 Generation – 380 kWh
 Export     – 39 kWh
 Divert     – 94 kWh
 Import     – 201 kWh

 Best day   - 7th, 29.3 kWh
 Worst day  - 13th, 2 kWh

Totals so far:

Month    |Generate (KWh)|Export (KWh) |Divert (KWh) |Import (KWh)
---------+--------------+-------------+-------------+------------
November |      163     |      --     |      --     |     443
December |      117     |       1     |      22     |     552
January  |      163     |       2     |      29     |     709
February |      213     |      10     |      47     |     496
March    |      436     |      26     |     119     |     384
April    |      705     |      54     |     219     |     207
May      |      734     |      63     |     223     |     141
June     |      722     |      54     |     230     |     104
July     |      720     |     177     |     220     |     111
August   |      613     |     127     |     184     |      58
September|      380     |      39     |      94     |     201  
---------+--------------+-------------+-------------+------------
Total    |     4987     |     552     |    1387     |    4006 

September was a shocker - way down on what was forecast.

slave1

It was, but Dublin seems not as gloomy as elsewhere based on stats posted

bod71

4kw SE/NW. South Dublin. Sept Gen. 212kw. Best 12.9/ Worst 3.2.

SouthWesterly

3.24kw facing west.

214.7 kwh this month.

Best 14.3

Worst 2.4(today)

705.1kwh since installing in mid July.

Location kerry

Jonathan

4.83kWp system facing south. Dublin.

System only commissioned on the 10th Sept, but 288kWh for month of Sept since installation.

Alkers

2.52kWp south facing, Dublin city, installed Dec 12th 2020.

December total 58.4kWh

January total 82.6kWh

February total 148.3kWh

March total 222.8kWh

April total 327.2kWh

May total 345.6kWh

June total 341.1kWh

July total 334.2kWh

August total 254.6kWh

September total 214.9kWh

Back down to March levels already, the declining output is causing me a mild dose of SADS!

Highest - September 7th (12.8kWh)

Lowest - September 12th (2.8kWh)

Highest Ever - July 19th (16.6kWh)

Boscoirl

200kWh for the month of Sept, only 5.5kWh exported

4kWp SSW facing in North Tipp

DrPhilG

September Stats

6.2kWp (2.8 south/3.4 west), 20kWh battery, Zappi & Eddi – Donegal

Generation – 347.6kWh (down 20% from last year! )

Export – 3.4kWh (down 94.3%)

Import – 316.2kWh (up 54.6%)

Best day - 1st, 26.1kWh

Worst day - 23rd, 2.6kWh

Awful month. 20% drop in generation since last year. Plus I charged the car a lot more this time than September last year so a big jump in purchase. However much of that purchase has been via overnight charging so I don't expect a bump in the bill.

ECO_Mental

https://www.boards.ie/discussion/comment/117961870#Comment_117961870

Went live with my system the same day as you so not a full month and I have a 6.1 kWp system. Its saying I generated 347 kWh. South facing, south of Cork City

ECO_Mental

https://www.boards.ie/discussion/comment/117962655#Comment_117962655

I have a 6.1 kWp system and only went live on the 10th September so only 2/3rds of the month but I generated the same as you 347 kWh.....(just to rub salt in your wounds 😎) Based just south of Cork City.

I am pretty happy with set up and looking forward to trying to maximize the use out if

Jonathan

https://www.boards.ie/discussion/comment/117962725#Comment_117962725

4.83/6.1*347 = 274.75kWh

So proportionally, my system performed better. 😋

Ummagumma_78

https://www.boards.ie/discussion/comment/117839986#Comment_117839986

September 324 kWh

Best day 23rd 23 kWh

Worst day 08th and 12th 4 kWh

Total since install 2.68 MWh

Significant drop in production output this month

graememk

https://www.boards.ie/discussion/comment/117834976#Comment_117834976

8.64kWp on a 6kw inverter,

12 degree roof, NE/SW 50:50

10kwh Battery storage

"September

Generation : 511.3kWh

Solar Used Directly : 174.8kWh - €35.43

Solar Used Nightrate : 15.2kWh - €0.89

Battery Charged : 198kWh

Battery Discharged Day : 137.6kWh - €32.33

Battery Discharge Night : 21.9kWh - €1.28

EVSE Divert : 5.8kWh - €0.34

Battery Discharged From Grid Charging : 22.3kWh - €2.91

Export : 117.5kWh

Total Savings : €72.29"

championc

Month | 2020 | 2021 

January | 75kWh | 56.14kWh 

February | 121.55kWh | 142.04kWh 

March | 200.59kWh | 269.23kWh 

April | 279.11kWh | 373.69kWh 

May | 396.34kWh | 430.96kWh

June | 264.13kWh | 425.00kWh

July | 261.88kWh | 387.40kWh

August | 254.10kWh | 264.41kWh

September | 268.62kWh | 248.31kWh

October | 151.43kWh | 

November | 90.4kWh | 

December | 56.47kWh | 

Total | 2.41mWh | 2.59mWh 

August Generated - 248.31kWh / Consumed - 230.82kWh / Imported - 46.25kWh / Exported - 20.41kw / Eddi - 22kw / Zappi 3kw

Meter Readings 03813 (00886 Day - up 29 / 02927 Night - up 40)

handpref

September 2021

5.4kwp east west split

286kwh produced