Nested AND / OR rules
Combine surplus, grid power, battery level, time and the state of each inverter, with "then" and "else" actions.
Surplus automations
Batteries full? Send the solar surplus to your water heater
At every moment TED knows the surplus, the battery levels and what each inverter is doing. Use it to switch your loads on at the right time, without writing a line of YAML.
Sounds familiar?
- Your batteries are full by 1 pm and the rest of the production goes to the grid.
- Your Home Assistant surplus automations keep switching on and off.
- You would like to consider battery level, time of day and surplus all at once.
Why it is hard
A good surplus rule has to combine several conditions (surplus, battery level, time) and avoid rapid on/off cycles. Written by hand, it quickly becomes hard to read and maintain.
Above all, it ignores what the HEMS is deciding: it may take energy the batteries should have stored.
The solution
The features involved
Home Assistant actions and webhooks
Turn an entity on or off (plug, water heater), run a scene or script, or call a webhook.
Debounce
A minimum delay between two triggers avoids bursts of switching when a cloud passes.
Notifications
Get alerted according to your own rules: low battery, faulty inverter, large surplus…
Actions are on/off (switch on, switch off, run a script). To finely modulate a heating element's power, a dedicated solar diverter is still useful; it can then be controlled through a Home Assistant script.
Getting it running
- 1
Make the load controllable in Home Assistant
A smart plug, a contactor or a script.
- 2
Create a rule
Automations page: conditions, then "then" and "else" actions.
- 3
Test, then enable
The history shows every trigger.
See it working before you install it
The live demo shows the real interface on a working installation: energy flows, inverters, batteries, settings.
Frequently asked questions
Do I need to know how to code?
No: rules are built in the interface, with drop-down choices.
Do the batteries keep priority?
You decide, through the rule's conditions: for example, only switch the water heater on when the batteries are above 90%.
Other problems solved
Zero export and maximum self-consumption with batteries
Surplus exported at noon, imports in the evening: keep the grid close to 0 W, continuously.
Read the solutionA local HEMS for Home Assistant, with no YAML to write
No more dozens of automations: a local, ready-to-use HEMS configured from a web interface.
Read the solutionCharge your batteries from the grid during off-peak hours
Little sun in winter: recharge your batteries off-peak and use them at peak times.
Read the solutionReady to make all your batteries work together?
Free download: your free license arrives as soon as your email address is confirmed, no credit card required.