Ya can’t win! It is S*d’s Law!

Toodles · 2025-09-15T14:23:09Z

I have been receiving invitations from Octopus Energy to use ‘Free Electricity’ on some afternoons when the wind doth blow and an hour’s ‘free above your normal usage’ energy offer is made. I have endeavoured to employ my degree in Scroogenomics and arrange for the Powerwall to need charging, the Sunamp Thermino to need some charge plus various domestic appliances to run during the hour, (on one occasion, 2 hour period). Even the kettle has been poised ready for switch on and today, even the heat pump was given its’ head for an hour. Wuddn’t you know it, during the preceding hours, there were numerous clouds and little solar energy to be harvested but, come the hour, the sun is bright, the air is cool and we have near record solar production! We did manage to extract about 10 kWh for free but the solar panels supplied about 6 kWh during that hour. Well I can only think that S*d was a busy boy writing all those Laws! Regards, Toodles.

Electricity, Tariffs, Monitoring & Providers

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Toodles

(@toodles)

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Joined: 3 years ago

Posts: 2092

Topic starter 15/09/2025 3:23 pm

I have been receiving invitations from Octopus Energy to use ‘Free Electricity’ on some afternoons when the wind doth blow and an hour’s ‘free above your normal usage’ energy offer is made. I have endeavoured to employ my degree in Scroogenomics and arrange for the Powerwall to need charging, the Sunamp Thermino to need some charge plus various domestic appliances to run during the hour, (on one occasion, 2 hour period). Even the kettle has been poised ready for switch on and today, even the heat pump was given its’ head for an hour.
Wuddn’t you know it, during the preceding hours, there were numerous clouds and little solar energy to be harvested but, come the hour, the sun is bright, the air is cool and we have near record solar production! We did manage to extract about 10 kWh for free but the solar panels supplied about 6 kWh during that hour.

Well I can only think that S*d was a busy boy writing all those Laws! Regards, Toodles.

This topic was modified 2 hours ago by Toodles

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

😂

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Old_Scientist

(@old_scientist)

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Posts: 247

15/09/2025 4:51 pm

@toodles this is another advantage of being on IOF. When there is a 'free electricity' hour, if you are on IOF then Octopus will credit you with a 'free hour of charging' in addition to any additional electricity usage. I'm not exactly sure what a credit for a 'free hour of charging' is, but I think it's 80% of my battery capacity (charging from 20% to 100%) at the day rate, so 10.8kWh x 22.36p = £2.41, plus any additional electricity I actually use for charging the battery etc. I've received amounts varying between £2.41 up to £2.93 for these sessions, so very happy with that given we've done nothing differently to our normal usage. As you have two powerwalls, I think you'd get a minimum of £4.82 per session in addition to any extra electricity used.

This post was modified 2 minutes ago by Old_Scientist

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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