It is an extra charge on top of everything else. In exchange, you get a super low night rate, and if you charge enough at home at night you will come out ahead compared to someone on another TOU plan. Their benefit is that you will likely charge less during peak hours and strain the grid less. A friend in a condo without solar is on that plan and happy with the results.
I have solar with about the same extra capacity as you do, I planned that in because I knew we'd go all-electric. I decided EV-TOU5 is not worth it for me, provided I could switch at all (never asked them).
What I do now is: Start charging around 5:30am to catch a bit of super off-peak rate, and then continue into off-peak at 6 am to completely offset my off-peak export. It is important to note that net metering under NEM 2.0 and DR-SES is per rate tier/slot. So my overall aim to be net zero in the off-peak 6am to 4pm slot, very low in the on-peak slot from 4pm to 10pm, and quite low in the super off-peak slot from midnight to 6am.
Still watching and playing with parameters.
I have solar with about the same extra capacity as you do, I planned that in because I knew we'd go all-electric. I decided EV-TOU5 is not worth it for me, provided I could switch at all (never asked them).
What I do now is: Start charging around 5:30am to catch a bit of super off-peak rate, and then continue into off-peak at 6 am to completely offset my off-peak export. It is important to note that net metering under NEM 2.0 and DR-SES is per rate tier/slot. So my overall aim to be net zero in the off-peak 6am to 4pm slot, very low in the on-peak slot from 4pm to 10pm, and quite low in the super off-peak slot from midnight to 6am.
Still watching and playing with parameters.