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  1. S

    Immersion Heater - PV electricity

    As soon as I see a flash, I ramp the power down, plus built in slow downward drift to cater for loss of communications. When seeing continuous LED, ramp up again, slowly, stopping when no LED. Ultra cautious, but for the money a marginal loss in maximum power usage. My £50 was for one-off...
  2. S

    Immersion Heater - PV electricity

    Richard et al. Thanks for that, saved me a patent search I'm sure! I spent ages last year searching internet for EMMA alternatives and could find no other device. My device monitors the meter LED in the same way (but is hard wired back to repeater LED in kitchen). I have no need for digital...
  3. S

    Immersion Heater - PV electricity

    Plotty, I have successfully created a remote monitor with a repeater in the kitchen which actually tracks my turning loads on/off and I have created logic to give a ramp up/down signal for a thyristor circuit. I had a false start when I bought a cheap 4 way 433MHz remote control and have since...
  4. S

    Immersion Heater - PV electricity

    In the past few months, I have monitored my weekly usage of peak, off-peak electricity and gas. For two weeks I heated water by off-peak only (i.e no solar PV to distort metering), and for another two weeks by gas only. There was very little difference in cost which surprised me. I agree that...
  5. S

    Immersion Heater - PV electricity

    Thanks for your input. As for your 3W v. 3kw point, my scheme will use the flash rate for feed-back. If the non-controlled house load goes up, or a cloud passes by, the led will begin to flash and the immersion heater loading will be reduced until equilibrium is restored. I've actually proved...
  6. S

    Immersion Heater - PV electricity

    Thanks for the warning, but something said earlier on in this thread (I think) put me on to a solution. The flashing rate is proportional to the import rate, so it slows down to 'off' when there is virtually no flow but then goes solid ON when exporting. I can detect this and my next stage is to...
  7. S

    Immersion Heater - PV electricity

    I'll begin with the customary apology - I'm new here, so hope this fits (no -pun intended) in with the current thread. I have solar PV and i too had been looking at EMMA, far too expensive, so I am in the process of testing a circuit which reads the flassing LED on my normal electricity meter...

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