Solar PV Performance Thread - Post your monthly output

garo

I use the forecast provided by my install company. They had some software do it. I've generally found it more accurate than PVGIS-SARAH which is a bit pessimistic. What angle tilt is your roof? With an E/W system in the winter a steeper angle can be slightly worse. My roof is pretty shallow at 24 degrees.

bullit_dodger

I'd have to do a bit of trig to work it out, but eyeballing it I'd place it at 35 deg. Interestingly I track my stuff pretty well (like most of us I guess) and my actuals verses forecasts for the last three months are as follows.

Fairly close to the estimate in Nov & Dec to be much to a muchness, but Jan was way over (in a good way of course!) I don't have enough data points to know if this is going to be an aberration or the forthcoming trend - but that's the background to my question.

5-10% is within a reasonable deviation I think. Approx 50% means that either Jan was a "stellar" month compared to my forecasts, or the forecast itself might be off as you suggested.

garo

And my trusty sheet says at 35 degrees you will get about 80% of what I get at 24 degrees for E/W panels in Jan.

slave1

https://www.boards.ie/discussion/comment/118563065#Comment_118563065

Phenomenal result for January, you must be pure S facing with zero shading

Jonathan

188kWh for January. I produced my first MWh since install during January.

championc

December Stats

2.7kWp (S), 10kWh battery, 22 deg Slope

 Generation – 80.54 kWh
 Consumed  - 310.72 kWh
 Import   – 292.88 kWh
 Export   – 5.74 kWh
 Eddi    - 10.9 kWh
 Zappi   - 0 kWh

Meter Readings 04807 (01071 Day - up 29 / 03736 Night - up 288)

Totals so far:

Month    |  2020  |  2021  |  2022  |
---------+--------+--------+--------+
January  |    75  |    56  |    81  |
February |   122  |   142  |        |
March    |   200  |   269  |        |
April    |   279  |   373  |        |
May      |   396  |   430  |        |
June     |   264  |   425  |        |
July     |   261  |   387  |        |
August   |   254  |   264  |        |
September|   268  |   248  |        | 
October  |   151  |   185  |        | 
November |    90  |    78  |        |
December |    56  |    52  |        |
---------+--------+--------+--------+
Total    |  2.41  |  2.90  |  0.08  |

Bif

233kwh from a 6.9kw array at 175 degrees.

rgfuller

3rd Full Month

Dublin - Lucan - January 22

7.12kW total installed (South: 3.45kW, East, 2.41kW, West 1.38kW(optimisers)). 5KWh Battery, (30 S & 22.5 E/W degree pitch).

Total Generation: 169kWh (70kWh consumed directly, 96kWh into battery, 3KWh to grid (Eddi))

Best Day: January 18th - 11.8kWh

Worst Days: January 13,15,25 - 1.3kWh

Total Consumption: 459kWh (41% Solar:59% Grid)

bullit_dodger

https://www.boards.ie/discussion/comment/118563555#Comment_118563555

And yet - I got 20-25% more than you did? Odd. Granted I've 10% more panels, but not sure I get the math behind a 20% drop from 24 degrees to 35 degrees. The angles are too small for that.

It might be some panel efficiency/inverter thing where my installation does better in lower light. Had a similar conversation with Jonathan a few weeks back. My lowest for the month was 1.1 kWhr on Jan 15th. I'd be curious to know what yours was on the same day.

Aside: My max was 5.38 Kwhr on the 26th.

(Just noticed you listed that.....Best day: 24th: 4.3 Worst day:15th: 1.2)

Dunno. Not that I'm complaining - but I always like to know the reasons "why".

munsterfan2

2.8KW array, South Facing, Meath ( No Battery installed, 10KW battery on way )

January summary

Generation – 108.9 (Best 11th/12th @ 7.5/7.91, Worst 15th @ 0.4)
Export     – 26.81 kWh
Import     – 1458.7 kWh
Zappi      - 405.2 kWh   

Import Usage Breakdown (Units)
   Boost    Day      Night
    268     710      481                 
    €17.53  €167.06  €58.25

Heat Pump (kWh)        
   Compressor 494.8    
Output (kWh)
   Heating        2107.5
   Hot Water        498.3

COP    5.3    


EV Stats - 
Zappi           -  405.1kWh ( €47.86)
ECar Connect    -  185.8kWh ( €61.64)
Leaf reports    -  491.8kWh = 2784.6km
€3.93 per 100km

garo

https://www.boards.ie/discussion/comment/118563937#Comment_118563937

Replied here: https://www.boards.ie/discussion/comment/118564638/#Comment_118564638

kabakuyu

2.5kwp system south facing Galway.

Best day 24th 8.2kwh.

Worst day 18th .6 kwh.

Total for month was 91.4 kwh.

septicsac

https://www.boards.ie/discussion/comment/118563662#Comment_118563662

Yes , south facing, bit of shading around a chimney, but optimisers on all 4 panels effected, steep pitched roof as well.

graememk

https://www.boards.ie/discussion/comment/118400749#Comment_118400749

8.64kWp on a 6kw inverter,

12 degree roof, NE/SW 50:50

10kwh Battery storage, building the 20kwh one nnw, 20.27c Day/5.83c night

January

Generation : 118kWh

Solar Used Directly : 85.2kWh - €17.27

Solar Used Nightrate : 0kWh - €0

Battery Charged : 26.6kWh

Battery Discharged Day : 20.9kWh - €4.31

Battery Discharge Night : 0kWh - €0

EVSE Divert : 0kWh - €0

Battery Discharged From Grid Charging : 252.3kWh - €32.43

Export : 6.2kWh

Total Savings : €54.01

ELCAT2009

January was my 2nd full month of production as only installed Mid Nov. However, only discovered towards end of January that my export to grid setting was turned on and set to "0w" meaning my solar production was ramping down once my batteries were full or if the solar production was greater than the charge to my batteries and house load combined so i think both Januarys figures and Decembers figures are lower than they should have been. Issue with export now sorted.

6.2kWp (3.1 southeast /3.1 southwest), 4.8kWh battery, – Galway

Generation – 104kWh

Export – 1kWh

Import – 987kw (includes 148kw of battery charging of night rate for use during the day i think..cant trust solis app!)

Best day – 11th 7.0kWh

Worst day - 14th, 0.6kWh

Zzippy

6.2kWp, SE, Galway

January felt like a very grey month, not a lot of sunshine. 156.38kWh produced. Best day was 24th with 13.14kWh, worst day the 18th (0.41kWh!).

Roll on longer days and higher sun...

slave1

Sh1tty month, I have fair degree of shading and also one string generating SFA this time of the year.

Midlands

4.1kWp SW, 3.3kWp NE

1345kW imported (two EV household)

90kWh Generated

83.1kWh consumed

40kWh to Eddi

0kWh to Zappi

Highest was 29th, 5.2kWh

Lowest was 18th, 0.9kWh

9% self sufficient (excluding Evs)

Monthly cash saving €16.85

Manic Moran

I was hoping for a little better for January, but with over 90% of my power consumption being created by the panels, I'm not going to complain. I'm kindof aiming to have a 100kWh surplus in the low consumption periods (to account for future installation of pool pumps), I guess I'm a panel shy.

DrPhilG

I'll throw up the stats tomorrow. But I just submitted a meter reading for 97 day units and 1400 night, lol.

championc

https://www.boards.ie/discussion/comment/118579370#Comment_118579370

You might be able to get that lower by exporting 5 or 10w, in case, like mine, it's slightly misreading and is constantly importing a small amount

DrPhilG

January Stats

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

Generation – 95.7kWh (almost the same as last year's 100.6kWh)

Export – 0.9kWh (oops)

Import – 642.2kWh, decrease from 710.9kWh last year.

Best day – 17th 9.0kWh

Worst day - 3rd & 10th, 0.7kWh

Last year I averaged 6.7kWh daily in February compared to January's 3.2kWh so better days lie ahead.

celtic_oz

143 KWh for Jan

Monaghan 6.2KWp, lot of cloudy days

jkgvfg

6kWp Kildare

Jan stats:

Production 162.5 kWh - Best day = 17th, 13kWh. 6 days below 2kWh

Export 22.2 kWh

import 454.9 kWh

Glad to see the back of January!! February days beginning to show about 50% stronger midday sun...when it shines!

optip

6kWp Clare - Jan Stats

yankinlk

https://www.boards.ie/discussion/comment/118570528#Comment_118570528

Mine is set to 0 - not causing me any issues AFAIK! This was dealt with recently in the troubeshooting thread i think.

ECO_Mental

A pretty healthy 367kWh for Feb. Considering its a short month I don't think it was a bad month.

6.1kWp just outside Cork City.

I have inputted my numbers into the PVStats website as well.

septicsac

Mixed bag for Feb, offline for numerous errors in relation to over voltage and over frequency of the grid, but still managed to produce 369kw in Louth on a 7.8kw system. Best day 29.1kw.

tails_naf

https://www.boards.ie/discussion/comment/118710384#Comment_118710384

Wow, I was happy with 233 for a 6.4 Kwp..now not so sure. It's still up on Feb last year at 208, but way off your number.

Bif

6.9 system. Almost due South.

championc

Thanks to the monthly stats, it made me look closely at my system and I believe I have 2 x dead optimizers. Will hopefully get up on the roof before the weekend