Heat Batteries

wully · 2025-09-27T16:58:58Z

Hi We heat our 1980 chalet bungalow in Shropshire with a tepeo ZEB heat battery and a mix of UFH and radiators. The ZEB is a dry-core heat battery, that consumes electricity when it is cheap, and stores it as heat. That heat is then delivered to the hydronic heating system when called for by a thermostat, in our case a Honeywell Evohome that modulates the ZEB using OpenTherm. As we have a time-of-use electricity tariff that means that the heat we use at 6pm in the evening cost 7p/kWh from the off-peak period, rather than 27.8p/kWh from the peak period, equivalent running costs to a CoP of ~3.9. We also have a Sunamp Thermino, controlled by a Myenergi Eddi solar diverter, for hot water as we don't have a lot of space for a traditional cylinder. For full disclosure I work at tepeo. But I like to think I can be objective, and I'm happy to talk frankly about my lived experience with our ZEB and Thermino.

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Majordennisbloodnok

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07/10/2025 8:00 am

Posted by: @transparent

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Most EVs use a CCS connector, which has no bi-directional capability.

….

Um, not accurate, I’m afraid.

CCS type 2 connectors are perfectly capable of bidirectional charging. The limitation is the car’s software. A demonstration of this can be seen by the recent over-the-air software update for Volkswagen’s ID3, whereby all post December 2021 cars with a 77kWh battery have become V2G capable. It certainly also requires a compatible bidirectional charging capable wall charger but the CCS charging port remains the unchanged.

As I understand it, there are issues with CCS type 1 connections but that’s common in the US; CCS2 is the European and UK standard and does not suffer the same limitations.

I suppose I should also point out that the bidirectional charging bit is technically pretty easy to implement. The trickier part is implementing the battery management and cooling to ensure the battery’s life doesn’t suffer unduly. Most of what’s in the software updates is there to deal with this part as far as I understand it.

This post was modified 2 hours ago by Majordennisbloodnok

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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