The video
In production – coming soon
The level 2 video is in production. It will appear right here.
What the video shows
- Two numbers: the account keeps the energy and what it cost. Everything else follows from them.
- Charging: each portion is booked at the price of the moment it came in, not at an average for the day.
- Discharging: energy always leaves at the average price of what is inside. Taking out never moves the price.
- Noisy readings: why a little smoothing keeps the account honest at night.
- The almost empty battery: the same top-up from the grid gives 4 ct or 36 ct, depending on what is already inside.
- The source rule: sun, battery or grid, checked in this order, then heat compared with heat.
- The old rule, up close: why a rule built on the most expensive tenth of all prices blocks about one hour in ten, no matter how full the battery is.
- Two wrong fixes and battery wear: why none of them belongs in the price.
- Where it gets tricky: prices that aren't known yet, and readings that need an age, not just a value.
Want the code now?
New to the topic? Start with level 1: When is electricity actually cheap?