We are in project management mode this month. Too many things to do and not enough time before our extension build kicks off. This will entail removing the rear of our house, so we are losing our kitchen, dining room, my daughter's bedroom and our conservatory.

The weather has been terrible over the Christmas period, with lots of rain, icy conditions and some snow too. It has made it very difficult to make any progress on the MX-5e, other than developing the electronics and progressing a few projects that can be done indoors.

The Driver Control Unit (DCU) is measuring the 12V battery voltage nicely and reporting it back to my smart home using Wi-Fi to connect. I'm wondering if the small variations are down to the temperature in the engine bay. The MX-5e is in a garage integrated into our home and it is not really insulated. I'm going to add ambient temperature measurement as well.

I continued to log the data and update this graph up until 16th Jan. It looks like the 12V battery can easily last a month. I'm now using an Optimate 2 smart charger and will log the data, to baseline the charging voltage profile.

My smart home uses Qpush to deliver notifications and this morning the Driver Control Unit (DCU) measured data resulted in a notification being sent to tell me that the 12V battery voltage in the MX-5e had dropped below my set threshhold.

The Driver Control Unit (DCU) data is now being used to monitor the 12V battery voltage whilst my Optimate 2 smart charger is connected, to baseline the charging voltage profile. The 12V battery seems to sit around 14.7V to 14.8V with the charger attached.