Solar Power Output – Let’s Compare Generation Figures - Solar Photovoltaic (PV)

RE: Solar Power Output – Let’s Compare Generation Figures

Toodles — Wed, 02 Sep 2026 11:03:23 +0000

@tim441 Here are those same three month periods for 2023, 2024, 2025 and this year. I hope they will appear in chronological order; the system seems to choose its’ own order sometimes!

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Regards, Toodles.

RE: Solar Power Output – Let’s Compare Generation Figures

Papahuhu — Tue, 01 Sep 2026 19:28:28 +0000

@tim441 Yes, I too am waiting for V2H before I get an EV or new home batteries. For retirees or home workers, with a car spending most of the time on the drive, it’s the perfect solution.

RE: Solar Power Output – Let’s Compare Generation Figures

Tim441 — Tue, 01 Sep 2026 18:39:43 +0000

@papahuhu yes, extremely hard to compare like with like.

We have 24.6kW batteries and with max charge/discharge rates at 2.7kW we can't fully operate at night rates. But the average over the year is still under 10p.

We even tweak thermostats 1 deg higher at night so that the morning demand at peak rates is reduced. Instead of a more normal setback.

So far I can't justify any upgrade of batteries size or charge/discharge... but clearly will need to be looked at if current system fails.

V2H/V2L/V2G will all need to be looked at in future I guess as that could be a gamechanger if easily integrated.

RE: Solar Power Output – Let’s Compare Generation Figures

Papahuhu — Tue, 01 Sep 2026 18:21:10 +0000

@tim441 Thank you.
We are at 300m2 and mid 70s vintage, but no UFH, so probably running with similar efficiencies. Although I keep my reference room at 19C instead of 21, which I prefer (I’d actually prefer 15C, but am alone on that in the household).
You do well to keep yours on a single TOU tariff, I can’t get away with that with just 14kwh storage and need to run cosy with the 3 slots, which works out at 14p. In my situation I struggle to justify spending another £10k on adding a further 28kwh battery storage to meet peak mid winter demand, the ROI on that extra spend would be decades.

RE: Solar Power Output – Let’s Compare Generation Figures

Tim441 — Tue, 01 Sep 2026 17:40:14 +0000

@papahuhu I have pretty good data. Notes:

100sq m is very old listed building

100 sq m is modern extension

First 2 years ran on fixed flows 55deg. After that weather compensation with aggressive low flows but main living areas 21deg. Other areas much cooler. Installed 2020. Exact monthly data from 2023

2021: 8050kWh

2022: 8050

2023: 5782

2024: 5741

2025: 5756

Showing importance of weather compensation. Added to batteries and Intelligent Go the costs are transformed.

Ave import price last year 9.1p

RE: Solar Power Output – Let’s Compare Generation Figures

Papahuhu — Tue, 01 Sep 2026 17:24:17 +0000

@tim441

Tim, do you mind if I ask how much power does your heat pump consume in a year please?I have a similarly sized 16kW unit and wonder if my annual consumption is atypical at 7MWh. It’s less than the 10 that was predicted by MCS calcs but it still feels a lot when Im trying torun it on the lean side of comfort.

RE: Solar Power Output – Let’s Compare Generation Figures

MK4 — Tue, 01 Sep 2026 16:32:26 +0000

More or less steady at 1Mwh for both 2025 and 2026….

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RE: Solar Power Output – Let’s Compare Generation Figures

Tim441 — Tue, 01 Sep 2026 09:08:06 +0000

Possibly useful to look at 3 months Jun, Jul, Aug and compare with previous years

2026: 2635kWh

2025: 2271

2024: 2239

2023: estimate 2140 including 15 day outage

2022: 2126

RE: Solar Power Output – Let’s Compare Generation Figures

ChandyKris — Tue, 01 Sep 2026 08:47:50 +0000

Ours was okish, still did better than last year August. We generated a little over 500 kWh. But, with the savings sessions, free weekend electricity, we ended up with a negative bill. Not complaining!!

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RE: Solar Power Output – Let’s Compare Generation Figures

Papahuhu — Mon, 31 Aug 2026 20:17:51 +0000

@toodles

Very nice.
Ours was the opposite, about 10% down on mean for August.

Finally won my battle with the insulation remediation firm that implemented my retrofit and getting SWIP internal room in roof insulation fitted tomorrow, on the main roof. I requested a trustmark audit and they confirmed the necessary remediation, free of charge. Going to be interesting to see what it does to my heatloss, Im hopeful it will bring the flow temp down a few degrees. The other roof I had similarly done resulted in me turning one of the 3 rads completely off. I didn’t know if it were better to leave the others fully open loop and close one, or back all of them off via the TRVs.

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