Earth Notes: Heat Battery Grid Top-up Maximum

(See the control parameters, logs, dataset and backstory.)

This page shows the maximum percent-full to top-up to from the grid, if any, for the DHW heat battery.

Diversion plus boost today: 9.670kWh (diversion now 0W, DHW h1d=2.7 h1b=0.0, heat battery h2d=6.9 h2b=0.0)

Heat battery control log entry: 2026-05-27T17:01Z MT 0 GI 131 IT 0 F FHS2TCN ES 6

Putative current raw top-up level (when allowed): 54% (normal min 0%, max 100%).

Eddi output priority 2: Thermino heat battery.

Eddi state 6: stopped (low grid frequency or diversion prevention) STOPPED 2026-05-27T17:01:02Z -1125W grid peak demand time (delayed)

Flags/status:

• [MT] 0% heat battery Maximum Top-up level: 0%
• [GI] Grid Intensity gCO2/kWh: 131 (7d mean 148)
• [IT] Grid gCO2/kWh Intensity Threshold below which discretionary top-up is allowed: 0.
• [F H] expected grid demand from High (peak) / - (normal) / Low (off-peak).
• [F S] grid response; Stopped boost/divert.
• [F F] good Forecast PV generation tomorrow.
• [F T] heat battery nearly full or full.
• Recent (7/8) full days excluding today when heat battery did not fill [nnnFnnnn]: 87%
• Recent DHW cylinder pasteurisation days including today, tank maximally Hot [---H----------H----].
• Grid frequency response minutes today (~50% of active): 17

External control tables:

• Expected grid demand by local hour of day [CSV].
• Grid intensity limit by demand level [CSV].
• Minimum (low-carbon) top-up by day of week [CSV].