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How do I set up Tesla Powerwall export for saving sessions since AI Takeover?

 
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Electricity, Tariffs, Monitoring, Electrics & Providers
Last Post by Papahuhu 27 minutes ago
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 Papahuhu
(@papahuhu)
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Joined: 11 months ago
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26/06/2026 1:31 pm  

@old_scientist It did work fine with cosy over the winter, although we have the larger version of your heat pump I only exceeded the battery capacity on about 5 days. I left the battery to do the clever cycling stuff and ran the heat pump as if it were on a flat tariff, wholly blind to the battery.


This post was modified 2 hours ago by Papahuhu

   
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Toodles
 Toodles
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Topic starter 26/06/2026 1:36 pm  

@papahuhu With 27kWh of battery capacity, I find the luxury of 24/7 heat pump operation and being able to avoid the ups and downs of temperature from trying to ride the peak prices, absolutely invaluable - no smugness intended, even if it is showing in dayglow orange!😉 Toodles.


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


   
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 Papahuhu
(@papahuhu)
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26/06/2026 1:40 pm  

@toodles 

How much power does your phase changing water heater thingy use in winter?



   
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Toodles
 Toodles
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Topic starter 26/06/2026 1:49 pm  

@papahuhu There are just the two of us and we shower and use cold fill for the washing machine and the dishwasher; however there is the need for hot water at the sinks. Winter consumption is ~4 - 4.5 kWh. During the summer, consumption is ~ 2.5 - 3.0 kWh. The Sunamp Thermino heat loss is stated as no more than 0.75 kWh per day; any ‘loss’ keeps our airing cupboard cosy year round. I should point out that our choice was greatly influenced by the inability to accommodate the MCS required size of DHW tank without enlarging the loft hatch and experiencing heat loss from the tank being in an unheated space. Regards, Toodles.


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


   
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 Papahuhu
(@papahuhu)
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26/06/2026 2:02 pm  

@toodles That’s economical, about the same as an immersion heater for 90 mins. I was expecting it to chew through an entire battery at least.



   
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Toodles
 Toodles
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Topic starter 26/06/2026 2:41 pm  

@papahuhu Here is a screen grab from Myenergi’s Eddi controller; all of the power supplied to the Sunamp Thermino is via the app whether solar or from grid. The daily consumption for each day so far this month. At this time of year, solar energy provides all power and as this would otherwise realise 12 pence per kWh. with Outgoing Fixed export, I reckon it is very reasonable. Regards, Toodles.

IMG 1664

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


   
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 Papahuhu
(@papahuhu)
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Joined: 11 months ago
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26/06/2026 2:55 pm  

@toodles Difficult to tell at this low resolution, but looks like the heating cycle is about 3-4 hours and about 2-3kW, so I make it very approx about 10kWh, which seems much more in line with what I’d have expected. Even at 10kwh at an heating efficiency of about 90% that’s still good going, you must be quite frugal with the hot water.



   
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