You can see here that DESS plans to discharge 4.51kWh between 18:00 and 19.00 which seems very reasonable given max discharge is configured at 7.5kW. However, if you look at the changes to target SoC, it actually plans to discharge 18% of battery between 18:00 and 18:30 and another 5% between 18:30 and 17:00.
The issue is that 18% discharge in 30min requires a discharge rate of 11.3kW (battery is 28.6kWh) and this is well above the 7.5kW maximum charge rate configured.
In my case (given I don’t have charge limit set) it is just discharging faster, but if I was limiting discharge or had a smaller system then the fact it wasn’t able to achieve what had been scheduled for a given slot would impact the whole plan.
In my view DESS should not really be scheduling this, as it’s doesn’t match the parameters provided in DESS settings. I’m wondering if this is a bug specific to half-hourly planning though?
Dumping 23% in 1hr does make sense and would be under the 7.5kW discharge limt, the issue is how this discharge is split between the two half-hour slots.
