Victron Energy

reading…

–battery

Power flow

🔌

Grid

–

🔋

Battery

–

☀️

Solar

–

–

before tax, per kWh

–

what the meter actually costs

–

grid import since midnight

spot planned charging now

Cost at spot–

Cost with tariff–

Tariff + VAT share–

Charged (scheduled)–

Estimated saving (spot)–

Estimated saving (+ tariff)–

–

At spot only–

Energy shifted–

Days recorded–

Every afternoon the day-ahead prices for the next ~36 hours are fetched, and the cheapest hours are picked as charging blocks.
At those times the inverter is switched to keep batteries charged; when the block ends it drops back to optimised, so the battery covers the expensive hours.
The saving figure uses a round-trip efficiency allowance — a battery gives back less than it takes, so cheap energy is only worth buying if the expensive hour is far enough above it.