ECO+ charging explained
Minimum Green Level
Choose how much surplus solar or wind power you need before zappi charges. Allow a grid top-up when there is not enough surplus to charge on its own.
Your EV needs a minimum charging current of 6 A, around 1.4 kW per charging phase. Lowering MGL lets grid power, or a home battery, make up the difference.
100% MGL
On single phase, zappi needs around 1.4 kW of usable surplus. If there is not enough, ECO+ waits or pauses after the configured delay.
Lower MGL
At 50%, around 700 W of surplus is enough for a single-phase minimum charge. A further 700 W comes from the grid, or a battery that supplies the load.
Try an example
See what changes when you move MGL.
Adjust both sliders to compare the surplus requirement with the power available.
Higher MGL means more surplus is needed.
Power left after household demand and any Export Margin.
Minimum charging power × MGL percentage.
Charging: 700 W surplus + 700 W top-up.
0 W remains exporting in this example.
Illustration with the EV ready to charge. Values are approximate. Start/stop delays, vehicle limits and other control settings are omitted. Three-phase figures apply when charging on three phases.
Three useful starting points.
Single-phase examples at the minimum charging rate, with no additional Export Margin.
| MGL | Surplus needed | Top-up at that point |
|---|---|---|
| 100% | 1,400 W | 0 W |
| 50% | 700 W | 700 W |
| 25% | 350 W | 1,050 W |
50% is a minimum, rather than a fixed split.
If more surplus becomes available, zappi uses it. With 2,000 W of usable surplus, a single-phase charge uses around 2,000 W of surplus and no top-up, even when MGL is set to 50%.
In the myenergi app
Change MGL in the app.
1. Open your zappi
Open the myenergi app and select the zappi icon on the home screen.
2. Select ECO+ and move the slider
Choose ECO+ charging mode. Set the Minimum Green Level slider between 1% and 100%.
The percentage changes how much surplus is required. It does not cap charging power.
On zappi
Change MGL on the display.
- Open Charge Settings, then ECO+ Settings.
- Select Min Green Level and set a value from 1% to 100%.
- Check the required export and import figures shown at the bottom of the screen.
Scroll sideways on a smaller screen. The example display shows 739 W export and 700 W import. Actual values vary with supply voltage and other settings. Menu names depend on model and firmware.
If you have a home battery.
Questions you might have.
Does MGL change the maximum charging speed?
No. It changes the minimum surplus contribution needed for ECO+ charging. zappi uses additional surplus when available, up to the EV’s capability and your installation limits.
What happens if the sun goes behind a cloud?
In ECO+, charging pauses if surplus is below the level required by your MGL setting for longer than the stop delay. It resumes when enough surplus returns and the start delay has passed.
Why does charging not start at exactly the example figure?
The 1.4 kW figure is approximate. Actual voltage, active charging phases, Export Margin, vehicle behaviour and start delays affect the result. Use the required export figure shown on zappi as your guide.
Does MGL limit a scheduled or manual boost?
No. A boost is not restricted to surplus power. It draws from available sources, which might include a third-party home battery.