Cheapest-energy-hours: outputs time outside start/end window

Configuration
1

Hi all, I installed the cheapest-energy-hours macro to predict the best times to charge my home battery. I use the following helper:

{% from 'cheapest_energy_hours.jinja' import cheapest_energy_hours %}
{{ cheapest_energy_hours(sensor='sensor.zonneplan_current_tariff', hours=4, start='06:00', end='17:00', include_tomorrow=true) }}

This worked fine until today. The current output is: “2026-03-25 01:00:00+01:00”. As It happens energy prices in the coming night are lower/equally low as tomorrow during the day.

This time is outside the specified start and end times in the call. I must be missing something, what am I doing wrong?

Please note, I have tried to include look_ahead=true but that doesn’t solve it as 1:00h is also in the future. I can also exclude today with include_today=false but then the current day will be completely skipped every midnight.

2

Answering my own question: it is sufficient if the macro looks at today.

So removing the “include_tomorrow=true” did the trick.

The only downside is that the macro will only output the correct time for tomorrow after midnight.

3

If you are in Europe then the energy.marlwts have almost all moved to a 15- minute window instead of an 1-hour window, but some of the older integrations are not maintained that well and have not been updated to take this change into account.

4

Thanks, my provider (Zonneplan) is still on 1-hour windows.