AndyT ( Andy Trewin ) formerly of Sunamp

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11 minutes ago, Ed Davies said:

My main point, though, was that there's no electrical input needed to control the PCM's phase-change behaviour; as I understand it; that's purely a thermodynamic/chemical/mechanical thing, however it actually works?


I can't see any means by which the electrical control box on ours can do anything other than enable or disable power to the heating element.  There is nothing else that is controllable in the unit itself; ours just has a heating element in the base that's connected to a 3 core power cable, plus a string of temperature sensors fitted vertically into a pocket in the cell to sense the bottom, centre and top cell temperatures.


I can confirm that the older Sunamp PV we had worked, in terms of heating hot water on demand, with the power supply to the unit turned off.  That suggests that no electrical input is required for the cell to work, in either direction, it just needs control of the charge temperature so as to not cause problems with overheating the PCM.

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38 minutes ago, Nickfromwales said:

It is, but I’m not sure hydraulically how thermosyphon would work in a SA


Don't worry too much about thermosyphon; I was just using it as an example of not using electricity. It's not something any real person I know of plans to do.

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Just digested the question you asked. 

Yes, the phase change is ‘au natural’ but ultimately you’d want the SoC controller to stop energy input if it was better off being sent elsewhere eg to space heating. 

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