Powerbeat Today
Learnings & Assumptions 222
My learnings as solar owner:
- Daily Production - It’s all about the daily solar production. Even the monthly and yearly solar production numbers look impressive, important is to charge your car and the home battery for the night on a daily basis. As result I started categorizing each day into 0-20 kWh, 20-40 kWh, 40-60 kWh, 60-100 kWh and 100+ kWh buckets.
- Summer Mode vs Winter Mode - A typical solar system in Germany is oversized during the summer and undersized during the winter. So the HEMS needs to run in different modes.
- Usage is not predicable - At least for me my usage is not predictable. Mainly the car usage (because it’s the biggest consumer), but also smaller energy consumers like washing machine and so on.
| Day Category | Daily Production | Label |
|---|---|---|
| Too low | < 20 kWh | Red |
| House only | 20+ kWh | Orange |
| House plus | 40+ kWh | Blue |
| Charge car | 60+ kWh | Green |
| Full charge | 100+ kWh | Yellow |
Today
As mentioned already above the daily solar production is key. I’m categorizing each day into 0-20 kWh, 20-40 kWh, 40-60 kWh, 60-100 kWh and 100+ kWh buckets. The main goal of the Today section is to determine into which bucket goes today’s day.
As reference the Tesla app is only showing today’s Generated kWh:
The Mobile App of the SMA inverter is showing even a forecast of the next hours and days, but unfortunately the app is not update the forecast data during the day:
A better day to visualize forecasts will be this diagram with a range between best and worst case:
