FennersFolk It all depends what tariff you are on and what your overnight usage is.
I’m guessing you are on something like Octopus Flux and your question is about what level to discharge the battery down to in the peak period?
Firstly do not use the battery reserve for this. The reserve is the amount of power to retain in the battery for use when there is a power cut. Effectively you are cutting your battery usable space down to 2/3 if you set it to this, leave it at 4%.
Secondly, you have to be very careful setting the force discharge in peak period. When you do a discharge (and export), you can specify a target battery percentage but when the battery reaches that %, it will stop discharging and any house load that’s above the amount of solar you are generating will be imported from the grid - i.e. the ‘discharge to’ is a lower limit that the battery won’t go below.
You need to instead plan your discharge so that you reach your target % for the evening/peak at about the end of the peak period. You’ll need to find this by trial and error.
And how much you want to keep for overnight usage depends on your personal consumption and battery size.
