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

Mars · 2021-03-16T16:40:26Z

A thread to post your great, not so great and downright awful stats about solar PV production.

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Solar Photovoltaic (PV)

Last Post by Toodles 2 weeks ago

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Papahuhu

(@papahuhu)

Honorable Member Member

Joined: 1 year ago

Posts: 407

01/09/2026 7:21 pm

@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.

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Tim441

(@tim441)

Honorable Member Contributor

Joined: 4 years ago

Posts: 463

01/09/2026 7:39 pm

@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.

Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8.7kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV

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Papahuhu

(@papahuhu)

Honorable Member Member

Joined: 1 year ago

Posts: 407

01/09/2026 8:28 pm

@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.

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Toodles

(@toodles)

Famed Member Contributor

Joined: 4 years ago

Posts: 2958

02/09/2026 12:03 pm

@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!