Solar PV Performance Thread - Post your monthly output

bullit_dodger · 28-09-2025 09:43PM

This year has been great (as well as the fact that last year was especially bad). I've already surpassed last years figure and it's only Sept 28th!!

Got 4541kwh last year, though to be fair my E/W setup really starts to drop off now in Oct onwards. So I'm guessing in about 4800 for the year.

championc · 29-09-2025 08:56AM

https://www.boards.ie/discussion/comment/123859243#Comment_123859243

Very much depends on how those three aspects are connected. You'll only have two strings, so what are the south four linked to ?

magicbastarder · 29-09-2025 09:22AM

eastward six and south four are on one string, all optimised.

discostu1 · 29-09-2025 09:57PM

Generated 691kwhs for Sept, 25 vrs 550kwhs for Sept 24. A very good month

JohnySwan · 29-09-2025 10:06PM

https://www.boards.ie/discussion/comment/123862388#Comment_123862388

Nice, ya it's been an excellent month for PV for me too in Cork.

Sponsorgate · 30-09-2025 10:25AM

First full month after install in mid August.

777 kWh produced. 9.79 kWp in West Cork. 22 panels. 5.4kWp West facing(12 panels). 4.5kwp East facing (10 panels). 18kwh battery storage.

loyatemu · 30-09-2025 01:20PM

Am I stuck in the past - it's still September until tomorrow!

discostu1 · 30-09-2025 06:27PM

Apologies my bad I forgot 30 days has September 😀

bullit_dodger · 30-09-2025 10:22PM

Great improvement over last Sept (which was terrible). Sept started out a fairly good month, but 2nd half of the month was only ok. I just about got PVGIS for a finish. (100.019%)

This is 6.5Kwp E/W in South Dublin city.

Shed (2.3Kwp South) added another 172Kwh, so a total of ~583Kwh for the month, sadly the drop off starts in earnest now for winter. Boo!

MacDanger · 30-09-2025 10:48PM

Poor month here in north Mayo, 499kWh vs 525kWh last year. Only barely better than March (472)

oleras · 01-10-2025 10:12AM

https://www.boards.ie/discussion/comment/123864853#Comment_123864853

Instead of the usual 29 ? 😜

loyatemu · 01-10-2025 11:33AM

Now that it's actually October…

6.45kWp in Greystones

Sept 2025: 459kWh (+3% on 2024)

YTD: 5275kWh

ionapaul · 01-10-2025 11:38AM

For September:

505kWh generated - 6.72kW system facing ESE in South Dublin.

284kWh consumed.

Generation up on September 2024 (469kWh) and down on September 2023 (597kWh).

In September, self-used 30% of electricity generated and fed in the other 351kWh (no battery).

Since initial installation on March 7 2023, a total of 21.68MWh generated, 15.2MWh fed to grid, with a self-use ratio of approximately 30%.

magicbastarder · 01-10-2025 12:43PM

total in for the month for me was 543.5kWh, down from 787 for August. it's only in a few months, so no historical data to compare against.

hammerdub · 01-10-2025 02:39PM

Only have solar installed since May.

May 544.75 to grid 463.66

June 712.98 to grid 597.73

July 898.49 to grid 742.13

Aug 777.33 to grid 621.64

Sept 478.91 to grid 406.13.

ranoutofcoffee · 01-10-2025 07:58PM

638.1 generated for September, 9.68 system. Only installed since July this year so no comparison prior year.

Soarer · 01-10-2025 08:39PM

721kWh generated.

9.66kWp system. 5.98kWp south facing, 3.68kWp north facing. First September.

rgfuller · 01-10-2025 09:22PM

47th Month

Dublin - Lucan - September 25 - 7.12kW installed (S: 3.45kW, E: 2.41kW, W: 1.38kW). E&W Optimised. 5KWh Battery, (30 S & 22.5 E/W degree pitch).

Total Generation: 461kWh (342kWh self use (inc. battery), 119kWh to grid)

Best Day: Sep 8th - 24.8kWh

Worst Day: Sep 20th - 5.2kWh

Total Consumption: 469kWh (72% Solar: 28% Grid Import (133kWh))

Milestones & Info:

Sep 2024 :: Generation 436kWh, Consumption 462kWh
Sep 2023 :: Generation 486kWh, Consumption 430kWh
Sep 2022 :: Generation 449kWh, Consumption 393kWh

74kWh to Eddi for Sept. 1 Day of no import. Passed 5MWh for 2025.

2025 - Monthly PV Savings :: Expected FIT €23.80 + Money Saved on Energy from PV €85.50 :: Total €109.30 for Sep. (FIT@20c /kWh, AvgUnitCstSaving@0 .25c/kWh)

2025 - Annual PV Saving progress :: (Jan 41.40, Feb 51.05, Mar 109.85, Apr 154.95, May 207.30, Jun 174.05, Jul 162.95, Aug 155.90, Sep 109.3) = €1166.75 Total saved/earned due to PV in 2025

GhostInTheRuins · 01-10-2025 10:07PM

386kwhs on my 4.4Kwp s/se.

I've no comparison to last year but I'm happy with it, still covered all my electricity bill for the month with some left over. October will be a different story altogether.

Exiled Rebel · 02-10-2025 02:56AM

7.79kWp south facing ground mount array. Co. Waterford.

702kWh generated versus 644kWh in September 2024.

First time exceeding PVGIS since I started adjusting the array in July.

oleras · 02-10-2025 10:18AM

11.04kWp split 12 panels E, 8 W & 4 S. 16kwh battery storage

Newgrange Warrior · 02-10-2025 10:22AM

6kWp south facing Meath (recently installed)

Sept = 490kWh

Aug = 690kWh

July = 750kWh

mikka631 · 03-10-2025 06:46PM

12 Panels azimuth 140° in Laois (2nd month)

5Kw Battery charging from grid 02.00 to 04.00 cheap rate (Electric Ireland)

Eddi Diverter to heat water

September Monthly Yield from PV
483.7kWh (August 616.9kWh)

September Monthly PV to Consumption
150.64kWh(31%) (August 199.19kWh(32%))

September Monthly PV to Grid
333.06kWh(69%) (August 417.71kWh(68%))

September Monthly Imported from Grid
96.8kWh (August 82.37kWh)

Most of my import from grid is the battery charging time.

Highest consumption is the electric shower, looking at changing this.

Now that the OFCH is coming on more often I have changed the heater priority on the Eddi to Heater 1 (sink element). Because both the immersion elements have a single thermostat I assume when it switches to Heater 2 (bath element) that it will switch off almost immediately. Hoping this is the case so that I will still be exporting to grid over the winter months thereby generating credit to offset the bill.