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This is exactly what I do, but I don't get s notification of the charger fails to click off outside the cheap rate time. So I assume it's going to do what it normally does, only to find it's continued to charge at expensive rate. I think it happens if the ohme device losses the 3g signal so can't communicate with the car. I understand issues like this will happen from time to time but I would expect to receive a strong warning on my phone when the charger losses its signal and that doesn't happen.I have an Ohme charger teamed with Octopus Go and I've been using it for about 9 months with only a few minor issues. I have found the best way for me is to use the cost limit on the Ohme app - 'don't charge over 5p per unit'. I leave this set all the time and do not schedule any charging on the car.
I set the car to 90% charge and leave it there.
Set the Ohme app so that it will add about 40% (it will adjust to the maximum it can charge in the period. This is usually 33%, but in reality, it adds 39% to 40%). It will automatically charge at the lower rates between 0030 and 0430 giving me about 40% of charge into the car.
Plugging into the car, it will start to charge and then click off. You can hear this and I also get an alert on my phone from the Ohme app. You can check that this is set as the lights on the Ohme unit will flash in a circular pattern - red-amber-green. This shows that it is set to smart charge.
Occasionally, the unit will continue to charge and not 'go smart'. Not sure why. If this happens, I unplug and plug in again and it sorts itself out.
I don't use the 'schedule charge' on the car at all. I've found it easier to leave the charger to do it's thing.
You can use the Ohme as a dumb charger or smart charger and switch between the two at will. The Ohme app is a bit clunky, but works fairly well. I haven't used is as a dumb charger with the car scheduled to control the charging times, so I can't comment on how well that works.