Greetings my fellow heatwave sufferers! Over here, we navigated May unscathed and we are bracing for June.

I wonder if I will live to see window shutters becoming the norm in the UK as they are in South Europe. Sooner than that I expect Mars and the users of the forum to open topics on using the cooling capabilities of the ASHPs. Till then and speaking from first hand experience, plain fans can be real relief. 

Below is our May output. You can see that this year we had more overcast days in May. 1st of May in particular was like November…

@mk4 Here we are with June 2026 Solar production then; worst year yet - not by much but then, one must always look on the bright side I suppose!

Regards, Toodles.

Our June 2026 generation is down too. We generated about 630 kWh when compared to 690 kWh last year. This June is almost the same as 2024 June though. Last year was great for solar overall. Interestingly, the heat wave hasn't been helpful and seems to throttle electricity generation down when it's very hot.

You weren’t alone, we were considerably down on last month and last year. But now that flux is back the revenue is worthwhile again, so I’m a happy bunny.

@trebor12345oodles Greetings! We have been hit by a failure, one of our strings went down mid-June and thus we are loosing the highest yield months….the installer was practically a middleman using subcos, the subcos have dispersed meaning it will be a while before operation is fully restored.

Luckily we still have some 8Mwh reserve already with the DNO and this should get us  through next winter unscathed.

How are you guys faring with the heat? We are reading some horror stories in the news (though mainly for continental Europe).

@chandykris Indeed, the elevated temperature does attenuate output from the panels quite significantly - in fact, you might say: Hot weather, they don’t like it up ‘em! Regrets, Toodles.

Not surprisingly July was best month ever

6.5kw system produced 1043kwh. Previous high 898 May 2025. 777 July last year

2.2kwh system 312kwh. 257 May 2025. 235 July last year

The hot weather probably reduced output significantly.  Maybe July sunshine in cooler temp woukd have resulted in up to 10% more even?

My son has a new system this year

8.5kw produced 1203kwh

What a month it has been for solar! We saw our best ever generation with excess of 700 kWh, even higher than last June. Sunny wise, probably June was better but the lack of 35 Celsius plus days meant our panels generated a lot more. We hardly dropped below 15 kWh in a day and consistently generating more than 20 kWh. With a few saving sessions thrown in when I could export from the batteries, we are on track for next zero bills from April to September.

Had I switched to Flux, we would have probably made more. Our batteries rarely drop below 85% to 90%. So, we could have avoided charging upto 100% from the grid and use only excess solar leaving off-peak only for the EV and hot water. But with constantly fluctuating gas prices, didn't want to switch to Flux and find that when we want to come back to Go or Cosy in October the prices have gone up a lot more.

@chandykris slightly intrigued by your production...

You have a 7kw system?

Orientation and pitch? Shading?

My 6.5kw system produced 1043kwh. 

East facing. 5deg pitch. No shading

2.2kwh system 312kwh.

South facing 45deg pitch. Some morning shade

I think the low pitch gets us suboptimal production but for more hours. So perhaps overall not as bad as people expect?

@tim441 Two reasons, the panels are South West facing. Plus, lots of clipping due to the 3.6 kW inverter. Our DNO approved only 6 kW export, and given our batteries are AC coupled that can export by themselves, we ended up with this design. If we were to start again, I would go for a larger 6kW hybrid option. Having said that, it's only in the peak summer months we see clipping. During other months or even when it's cloudy, the oversized panels help us generate more. Wish I had discovered this forum when we were in the process of installing our array.

@chandykris i think many of us would do things differently with more knowledge... and as tech moves forward

Our bigger system typically produces around 5100kwh/pa... last year 5500 which seems in line with the installer predictions 

Smaller system around 1700kwh

Again the flat roof seems to out perform pitched on proportionate basis

We are capped at 6kw export which probably results in a little clipping. But hardly noticeable 

No great surprise given how relentlessly sunny, dry and drought-like July has been, but our 6.16kW solar array has just set a new monthly production record: 1.0MWh generated in July.

That is comfortably ahead of every previous July since the system was installed.

Not often I find myself wishing for rain while watching the solar numbers climb, but the garden would probably have preferred a slightly less impressive month.