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[Sticky] Solar Power Output – Let’s Compare Generation Figures

 
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Solar Photovoltaic (PV)
Last Post by Papahuhu 4 days ago
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2537
01/02/2026 10:47 am  

New Year, But Not the Best January Production.

The trend of increasing monthly production year by year has gone downhill I’m afraid. Oh well, perhaps February will do better!

IMG 6758
IMG 6757
IMG 6759
IMG 6760

Regards (Regrets maybe?) Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Papahuhu
(@papahuhu)
Reputable Member Member
Joined: 6 months ago
Posts: 179
01/02/2026 11:03 am  

Sun path critical for us, needs to get over a hill to hit the roof,  currently lightly touching our lower smaller array but not the main roof yet. Back end of Jan starting to perk up even with daily rain and cloud. 

image

 


This post was modified 6 days ago by Papahuhu

   
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 SKD
(@skd)
Estimable Member Member
Joined: 4 years ago
Posts: 60
01/02/2026 12:42 pm  

We've had solar for the past three Januaries.  These were our monthly yields: -

Jan 2024: - 320kWh

Jan 2025: - 256kWh

Jan 2026: - 309kWh

 

Full years so far: -

2024: - 7588kWh

2025: - 8723kWh, including increased battery capacity which greatly improved (reduced) inverter clipping during solar peaks.

 


Mitsubishi Ecodan 11.2kW R32 ASHP; Ecodan DHW cylinder; UFH+rads
20x430W Jinko TOPCON Tiger Neo solar; Luxpower 6+4kW hybrid inverter; 20kWh Hanchu ESS LFP battery storage
PHEV; Zappi charger
1997 stone detached house with updated insulation. 140sqm, maintained at 20-22degC 24/7


   
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 MK4
(@mk4)
Trusted Member Member
Joined: 2 weeks ago
Posts: 25
02/02/2026 4:24 pm  

2025 yield was 9MWh, 7x565Wp facing SE + 7x565Wp facing NW (almost 8kwp installed power). Sun disappearing rather too soon behind a hill in our location.

The production numbers I read in this thread have impressed me as I always thought of UK as a rainy, ever overcast place. But then I realized that compared to Greece a) daylight lasts longer in the summer b) summers are cooler and this helps the panels plus c) climate change is here

Since Heathrow was mentioned in an earlier post, Athens International Airport (1/3 of Heathrow in annual passenger volume) runs completely on PV in-situ generated power as of January 2026. Installed capacity is 51MWp plus 82MWh batteries. If you go in Google Maps you can see the panel farm installed along the runway. I would assume they have backup connections to the grid also. I thought I’d mention it to boost our faith in technology… 🙂

IMG 8601


   
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2537
02/02/2026 4:38 pm  

@mk4 Coo! That’s a tidy bit of solar produced power!!! Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Papahuhu
(@papahuhu)
Reputable Member Member
Joined: 6 months ago
Posts: 179
02/02/2026 6:23 pm  

@mk4 For many of us, whom live in the less sunny parts of the country, we overcome poor per panel production by installing oversized systems. With cheap but good Chinese panels it becomes an economically viable option to do this, whereas it never used to be. 
Does Greece offer viable export rates for your excess production, or do you run aircon to use up that 9mWh instead?


This post was modified 4 days ago by Papahuhu

   
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 MK4
(@mk4)
Trusted Member Member
Joined: 2 weeks ago
Posts: 25
02/02/2026 8:13 pm  

@papahuhu 

We have a netmetering contract. The unconsumed energy flows into the grid, we draw from the grid what we need (when PV production and/or battery energy cannot cover our needs) and there is a clearance every 3 years. If we source more than we gave to the grid, we pay for the extra energy. If we gave more than we sourced, we get nothing.We have no aircon units (we live in a relatively cool area), so today all the excess flows into the grid.
We pay of course network usage charges for every KWh we source from the grid (circa 5 cents). 

This type of contract is no longer available. Nowadays the clearance is done on a billing level i.e. How much  was the cost of the KWhs when you sourced energy minus how much was the cost when you gave to the network. Energy providers had a problem with netmetering, because everybody was producing in the summer (when sometimes energy cost is 0 in the country energy exchange due to mass PV and wind  production) and sourcing in winter when energy is always more expensive.

The sizing of the PV panels was done with the ASHP in mind. Since we just installed it, I guess we will know in circa 15 months where we stand.



   
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 Papahuhu
(@papahuhu)
Reputable Member Member
Joined: 6 months ago
Posts: 179
02/02/2026 8:39 pm  

@mk4 Nett metering is great. The VPP I’m on works by charging the same for import and export, they then issue debit or credit each month to the account. We are doubly lucky because at the high solar months we can switch back to a tariff that favours nett import and can switch back again in the spring. I don’t know how long they will allow this to happen as I had a nett export of about 9mWh, so several thousand pounds, but it’s clearly not sustainable for any supply business to carry on doing this. My assumption is that the regulator will have to start to limit the array sizes or put a lower cap on export. It feels a bit ethically irresponsible, but us petite bourgeoise are too small minded to let that get in the way of making a little profit. 



   
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