I'm on the Octopus intelligent Go tariff and recently signed up for the beta and really appreciate the work you are doing in this respect. So far charging the battery and EV overnight seems to be working fine. But as I start the day with a full battery however I have an issue when my PV peak production exceeds my inverter capacity (my PV is 7.74 kWp and inverter is 5 kW). So in order to maximise my actual PV production I want my battery to be discharged by the time the PV production reaches the nominal inverter capacity. In this way I can charge the battery using the excess DC power.
Around this time of the year I expect PV production to reach the inverter capacity at around 11:00. So I set a discharge schedule in Wonder Watt starting 7:30 till 11:30 to discharge the battery to 10%. However it seems Wonder Watt changes that schedule to stop around 9:00 (I presume because it assumes by that time the battery will be discharged to 10%?). This means at 9:00 the battery resumes back to charging, and my battery is fully charged by the time PV production reaches nominal inverter capacity. So exactly what I was trying to avoid.
Another issue is that trying to anticipate the time the minimum battery capacity is reached the system does not take into account the nominal inverter capacity. E.g. if solar PV production reaches 4kW and the nominal inverter capacity is 5 kW, the power available to discharge the battery is only 1 kW, not 3.6 kW. meaning the discharging slows down significantly when PV production ramps up (hence why I foresee a 4 hour window to discharge the battery).
Is there any way to avoid this other than having to take manual control. Perhaps allowing to set a firm discharge schedule for the time window I specify, irrespective of the anticipated timing of the battery reaching the minimum charge?
