Overview

With Microgrid, the Voltmasters EMS keeps a site powered when the public grid fails. The controller separates the site from the grid, the battery forms a local grid of its own (island operation) and, when needed, a generator takes over. When the grid comes back, the controller reconnects the site safely and in a controlled way.

What the customer gains

• Continuity: the business keeps running during a grid outage, without anyone on site.
• Critical loads stay powered: the customer chooses what may never be switched off (cold storage, servers, process). The rest is shed in order of priority.
• The generator only when it is needed: it starts when the battery runs low, not at every outage. Fewer running hours, less fuel.
• A battery that earns its keep in normal times: on the grid the battery keeps optimising energy costs. It only holds back a reserve for a possible outage.
• Everything is visible: live status, notifications and a report on grid availability and generator use.

How it works

1. On the grid: the battery stands ready

   The site runs normally. The controller keeps an island reserve in the battery (50 % by default), so there is always energy available when an outage hits.

2. The grid fails: the site switches to island operation

   The controller opens the grid breaker and the battery forms the site's grid. The switchover causes a short interruption, after which the site runs on its own on the battery and the solar panels. If consumption exceeds what the battery can deliver, the controller sheds the non-critical loads in the chosen order.

3. The battery runs low: the generator starts

   Below a state of charge threshold (20 % by default), the controller starts the generator. The generator then forms the grid, powers the site and recharges the battery. Above the stop threshold (90 % by default), the generator stops again.

4. The grid returns: controlled reconnection

   The controller waits until the grid voltage and frequency are stable, then reports that the grid is back. Reconnecting causes a short interruption (at most two minutes when the battery forms the grid). That is why a responsible person releases it with one click, at a suitable moment, in the platform or the mobile app. The site can also reconnect automatically.

A complete outage in seven steps. Watch who forms the grid: blue for the grid, green for the battery, pink for the generator.

What the customer sees

• A live single line diagram on the project dashboard: who forms the grid, the breaker positions, the power flows and the current step of every procedure.
• Notifications when the grid fails and when it returns, with the Release reconnection button in the platform and a push notification in the mobile app.
• The microgrid report: grid availability, outages, reconnections, generator running hours and energy, fuel cost, with a CSV export.

What the site needs

Component	Role
Voltmasters controller	Runs the whole sequence: outage detection, island operation, generator, load shedding and reconnection.
Battery with a grid-forming inverter	Forms the site's grid during island operation.
Grid breaker with position feedback, and a decoupling relay	Separates the site from the public grid and confirms its position to the controller.
IO module (Moxa ioLogik E1214)	Connects the breakers, the protection relay and the generator start to the controller.
Generator (optional, DEIF AGC 150)	Takes over when the battery runs low during a long outage.
Solar panels (optional)	Keep producing during island operation, limited to what the site can absorb.

How this section is organized

• How Microgrid works: the operating modes and every transition between them.
• Live monitoring: the single line diagram and the procedure panel on the dashboard.
• Grid reconnection: releasing the return to the grid, step by step.
• Configuration: prerequisites, microgrid settings, IO roles, generator and load shedding.
• Microgrid report: outages, reconnections and generator use over a period.
• Incidents: the notifications Microgrid raises.