A single controller
A single regulation reads the meter and decides: it computes the total power needed, then splits it. Each battery gets its share, not the whole gap.
Several batteries
Are your batteries oscillating or feeding each other? Give them a single conductor.
Each battery corrects the meter reading on its own, unaware that the other is doing the same. TED computes one setpoint and shares it out: no more ping-pong.
Sounds familiar?
- Grid power swings up and down instead of staying close to zero.
- One battery charges while the other discharges, at the same moment.
- Needless losses: energy travels from one battery to the other through the inverters.
- Delayed reactions add up and amplify the swings.
Why it is hard
A battery in "meter" mode (zero export) reads the grid measurement and corrects the gap. If two batteries do it at the same time, each corrects the whole gap: together they overshoot by a factor of two, then correct the other way.
With reaction times that differ between brands, the corrections cross each other: oscillations, and sometimes one battery recharging with the other's energy.
The solution
The features involved
Smoothed measurement
The meter reading is smoothed to ignore short spikes (an appliance starting) instead of reacting to every change.
Everyone in the same direction
All controlled batteries charge together or discharge together: never one against the other.
Clusters
Several inverters can be grouped into a cluster: averaged battery level and a shared setpoint, like a single device.
Getting it running
- 1
Turn off each battery's own regulation
Or keep it on one battery in assisted mode: that battery is monitored and the others top up.
- 2
Declare the batteries
As controlled, with their maximum power.
- 3
Choose the meter reading
A Home Assistant entity, or a Shelly read directly by IP for a faster measurement.
- 4
Set the loop cycle
A few seconds is enough: shorter is finer, but more sensitive.
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 a special meter?
No: any meter whose measurement (import and export) reaches Home Assistant works. A Shelly read directly is simply faster.
Can I keep one battery in meter mode?
Yes, just one: that is assisted mode. It is monitored, and the other batteries' power is added based on what it is already doing.
Are batteries of the same brand affected?
Yes, the problem appears as soon as several devices each regulate on their own, even identical ones.
Other problems solved
Make several battery and inverter brands work together
Each manufacturer app ignores other brands. Here, they all work together under one setpoint.
Read the solutionZero 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 solutionControl several Zendure units (SolarFlow, Hyper) in Home Assistant
Several SolarFlow and Hyper units, with or without the Zendure app: the brand tested and validated every day.
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.