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: 0kWh (diversion now 0W, ...)

Heat battery control log entry: 2026-01-05T09:41Z MT 0 GI 258 IT 38 F WFRbvx1wN ES 1

Putative current raw top-up level (when allowed): 75% (normal min 0%, max 100%).

Eddi output priority 1: DHW tank, for pasteurisation.

Flags/status:

• [MT] 0% heat battery Maximum Top-up level: 0%
• [GI] Grid Intensity gCO2/kWh: 258 (7d mean 129)
• [IT] Grid gCO2/kWh Intensity Threshold below which discretionary top-up is allowed: 38.
• [F ] expected grid demand from High (peak) / - (normal) / Low (off-peak).
• [F B] Enphase AC Battery SoC too high to allow transfer to heat battery, or unknown [b].
• [F F] good Forecast PV generation tomorrow.
• [F R] grid is Red (high) intensity, or unknown [r].
• [F W] solar generation Winter minimum.
• [F w] waiting for good grid conditions to run DHW cylinder sterilisation/pasteurisation.
• Recent (8/8) full days excluding today when heat battery did not fill [nnnnnnnn]: 100%
• Recent DHW cylinder pasteurisation days including today, tank maximally Hot [-------------------].

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].