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Who's your electricity provider and what's your tariff?

 
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Electricity, Tariffs, Monitoring & Providers
Last Post by Old_Scientist 2 hours ago
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Toodles
 Toodles
(@toodles)
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07/07/2025 5:37 pm  

@old_scientist Another point I might have made a little more clearly is that I put ‘consumption’ for 2025 as this figure includes some 600+ kWh used just to charge battery on each of the 30 days and without this battery charging, my actual consumption was ~450 kWh or less. It will be very interesting to see how your figures pan out over the more favourable summer months. Regards, 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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07/07/2025 8:24 pm  

Posted by: @toodles
↑

@old_scientist Another point I might have made a little more clearly is that I put ‘consumption’ for 2025 as this figure includes some 600+ kWh used just to charge battery on each of the 30 days and without this battery charging, my actual consumption was ~450 kWh or less. It will be very interesting to see how your figures pan out over the more favourable summer months. Regards, Toodles.

@toodles Indeed. On a tariff such as IOF where import and export prices are the same, the only thing that really matters is the difference between consumption and generation, i.e what is the net export for the period. Due to round trip losses, I grant it will be more efficient if there were less grid charging and more solar charging or the battery, but that is more than offset by the fact that you've dumped your battery at peak rate (29.8p) in the first place.

Our summer usage is ~10-12kWh per day. Our generation with the extra solar panels should be 10-50kWh/day (50kWh on a perfect cloud free mid-summer day).

Looking at my own numbers for the first half of summer (April - June), we would have been around £45-50 better off had we been on IOF, and that's without exporting 10kWh per day at peak rate. Extrapolate that to be around £100 for the 6 month period April to September, and then factor in we are also doubling our solar capacity, all of which will be exported at 22.36p giving maybe another £500 plus, and I think we'll have £600 in credit to carry into winter (although not this winter). With the additional solar generation in winter, I'm hoping we will be very close to being net zero cost for the year.

The other aspect I like of combining IOF in summer with Cosy in winter is that every kWh we export in summer (at 22.36p) buys us back 1.5kWh of heat in winter (at 12.91p and allowing for 15% round trip losses), or 2kWh heat in winter for exporting at peak rate (29.82p) in summer (based on current rates). That really does incentivise us to minimise our usage in summer to maximise our budget for winter.

 

This post was modified 2 hours ago 2 times by Old_Scientist

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 3.645kWp solar (south facing), Fox ESS inverter.
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.


   
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