Important
myenergi products are designed for grid-connected systems and are not officially supported for off-grid use. This guide is provided for informational purposes only. Any off-grid integration is undertaken at the user's own risk, and our support is limited when assisting with non-standard configurations.
Overview
While zappi and eddi were not designed for off-grid systems, their intelligent power management features make them a workable option for those with the right technical knowledge. The core concept is straightforward — in an off-grid setup, the battery takes the place of the grid. The myenergi device monitors power flowing to and from the battery in the same way it would monitor a grid connection, using this information to automatically divert surplus solar energy to charge a vehicle or other load.
CT Clamps
CT clamps measure AC current flow and are essential for the device to determine how much surplus energy is available. The CT clamp must be installed on the AC output cable of the battery inverter — this is the CT1 (grid) position. From here, the device can monitor all power flowing in and out and treat it as it would a grid connection.
Note: CT clamps only work with AC current. They cannot be installed on DC cables.
Inverter Float State & eSense Integration
When a battery nears full charge, the inverter enters a float state — it reduces its output to match the load on the switchboard to prevent overcharging. If the inverter or battery management system includes a float relay, this can be wired to the eSense input on the zappi or eddi. When float is detected, the relay triggers Boost Mode, directing surplus energy to the vehicle or connected load. Boost Mode ends automatically when the battery exits float, ensuring the battery is never compromised.
If a float relay is not available, Boost Mode can be triggered manually. As the battery discharges under the boost load, the solar system replenishes it — the device detects this incoming energy as surplus and redirects it to the load accordingly.
See Also: Using eSense
Export Margin
A export margin can be configured to reserve a set amount of energy for the battery before the device begins diverting surplus to the connected load. This ensures the battery is adequately maintained and takes priority before energy is redirected elsewhere.
Summary
By combining CT clamp monitoring, eSense integration, and device settings, myenergi products can be configured to intelligently manage energy in an off-grid environment. This falls outside standard supported use — ensure you have the appropriate expertise before attempting this configuration.