# Incidents

> The incidents a Voltmasters microgrid raises: grid loss, reconnection, island overload, PV, battery inverter and generator, and what to do about each.

Source: https://voltmasters.io/en/docs/microgrid/incidents/

The controller raises an incident when the microgrid changes state or something needs attention. They appear in the project's **Incidents** list, like every other incident. See [Incident management](https://voltmasters.io/en/docs/voltmasters-platform/incident-management/) for the list, muting and notifications.

![Voltmasters EMS: incident list with the incidents Grid supply lost and Reconnection to the grid awaits release](https://voltmasters.io/assets/docs/microgrid-incidents.webp)

*Two outages in the incident history: each time a grid loss, followed by a reconnection that awaited release.*

## Notified immediately

These four are sent as emergency notifications, by email and mobile push, because somebody has to know or act right away.

| Incident | What it means | What to do |
| --- | --- | --- |
| **Grid supply lost** | The grid fell away. The site runs as an island on the battery, and on the generator once the state of charge drops. | Nothing: the site keeps running. Follow it on the [live diagram](https://voltmasters.io/en/docs/microgrid/live-monitoring/). |
| **Reconnection to the grid awaits release** | The grid is back and the site is ready to reconnect. | [Release the reconnection](https://voltmasters.io/en/docs/microgrid/grid-reconnection/) at a suitable moment. |
| **Reconnection to the grid was aborted** | The reconnection did not complete. The site stays an island. | Check the reason in the banner, then release again. |
| **Island is overloaded** | The site draws more than the battery and the generator can supply, and there is no load left to shed. The island can trip. | Switch off consumption by hand. |

## Other microgrid incidents

| Incident | What it means | What to do |
| --- | --- | --- |
| **Microgrid mode fault** | The microgrid logic ended in a fault and no longer switches modes on its own. | Contact your installer or Voltmasters support. |
| **PV limit may have failed in island mode** | A PV inverter cannot be read in island operation, so its limit may not hold. The EMS takes the PV off the island until every inverter reports again. | Check the PV inverter's communication. Without a wired PV release the EMS cannot take the PV off. |
| **Battery inverter is off while on the grid** | The site cannot fully switch to island operation at the next outage. | Contact your installer. Mute the incident if the inverter is off on purpose. |
| **Generator no longer controllable** | A started generator keeps running but no longer follows the controller. The EMS asks it to stop, unless the island depends on it. | Have the generator checked on site. |
| **Generator did not come online after its start** | The generator did not connect in time. The island runs on the battery alone until a new attempt succeeds. | Check the generator if it repeats. |
| **Generator failed to synchronise** | The generator breaker did not close because synchronisation failed. | Check the generator if it repeats. |
| **Reverse power on the generator** | Power flows into the generator. Its controller may open its breaker. | Have the generator settings checked. |
| **Generator start is held back** | The generator is needed, but the battery cannot absorb its minimum load yet. It starts as soon as there is room. | Nothing. |

The alarms of the generator controller itself (for example crank failure, low oil pressure or a service timer) also appear as incidents, each under its own name.