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: 2.651kWh (current diversion 0W, DHW h1d=0.1 h1b=0.0, heat battery h2d=2.6 h2b=0.0)

Heat battery control log entry: 2025-05-22T22:51Z MT 0 GI 139 IT 46 F Fbvx2N ES 1

Putative current raw top-up level (when allowed): 7% (normal min 0%, max 100%).

Flags/status:

• [MT] 0% heat battery Maximum Top-up level: 0%
• [GI] Grid Intensity gCO2/kWh: 139 (7d mean 139)
• [IT] Grid gCO2/kWh Intensity Threshold below which discretionary top-up is allowed: 46.
• [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.
• Recent (1/8) full days excluding today when heat battery did not fill [FnFFFFFF]: 12%
• Recent DHW cylinder pasteurisation days including today, tank maximally Hot [HHHHH-----------].
• Grid frequency response minutes today (~67% of active): 67

External control tables:

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