A microgrid is a small, local electricity system that can run in two ways: connected to the main grid, or separated from it as an island. It combines local generation, storage and controls within one boundary — a home, a campus, a depot or a neighbourhood — so the lights stay on inside that boundary even when the main grid fails. If your home can power itself from a car during a cut, it is already behaving like a microgrid of one.
Key Takeaways
- A microgrid is a local system — generation, storage, controls and an island switch — inside one boundary.
- An EV can be its flexible load and, if bidirectional, its storage; the discharge floor protects your driving.
- Solar panels alone do not make a microgrid; the island switch is what makes outage operation safe.
- It is a designed, approved system, not a single product — grid connection follows the utility’s rules.
The Four Parts Every Microgrid Needs
| Part | What it does | At home, it looks like |
|---|---|---|
| Local generation | Makes power inside the boundary | Rooftop solar panels |
| Storage | Holds energy for when generation stops | A home battery — or an EV battery |
| Controls | Decide what runs, what charges and what waits | The energy management system and charger settings |
| The island switch | Disconnects the boundary from the street supply, safely | The gateway fitted with a bidirectional system |
Remove any one part and the idea fails. Generation without storage stops at sunset. Storage without an island switch cannot legally or safely run your home in a cut, because power must never flow back into lines that repair crews are working on. The switch is what turns a collection of equipment into a system.
Where an EV Fits In
An electric car is the largest battery most homes will ever own, and it is the only one that arrives and leaves. Inside a microgrid it can play three roles:
- A flexible load. Charging can be scheduled or throttled to match solar output or cheap hours, which is the everyday job of smart charging.
- Storage that discharges. A bidirectional car can feed the home in a cut (vehicle-to-home) or export to the grid (vehicle-to-grid), as our overview of bidirectional charging: V2L, V2H and V2G explained sets out.
- A load that must be protected. The system keeps a floor of charge in the car, so backup power never strands the driver.
Most cars on the road today can only take the first role — when vehicle-to-home will be available explains why capability is still limited to certain models and matched equipment.
Home Scale and Community Scale
At home scale, the microgrid is one property: panels, a battery or bidirectional car, and a gateway. Its job is narrow — keep essential circuits running through a cut and shift energy between sunny and expensive hours. At community scale — a housing development, a hospital campus, a fleet depot — the same parts are shared across buildings, and the controls also decide which buildings get priority when stored energy runs short. The engineering is professional work at both scales, and anything that connects to the grid sits under the utility’s interconnection rules.
What a Microgrid Is Not
- Not a product on a shelf. It is a designed system of matched parts, installed and approved as a system.
- Not the same as a generator. A generator only makes power; it stores nothing and coordinates nothing.
- Not automatic with any EV. A one-way charger cannot discharge a car, and a one-way unit cannot be converted later.
For daily charging inside any of these setups, the car is simply a load like any other. A unit such as the EVDANCE EV-ACT5006T 48A Level 2 wall charger covers that job today; see the residential charging solutions page for the home range. EVDANCE makes chargers, not microgrid systems — the gateway, storage and controls come from the system designer.
Frequently Asked Questions
Is my home a microgrid if I have solar panels?
Not yet. Panels alone stop working in a power cut. You need storage, controls and an approved island switch before the home can run on its own.
Can one EV really be part of a microgrid?
Yes — as storage and as a controllable load. In a cut, a bidirectional car discharging to chosen circuits is doing exactly what microgrid storage does, at household scale.
Do microgrids have to disconnect from the main grid?
No. Most run connected almost all of the time. The island mode is a capability they use when the main grid fails, not their normal state.
Related Reading
- Bidirectional Charging Explained: V2L, V2H and V2G
- When Will Vehicle-to-Home Be Available?
- Is Bidirectional Charging Worth It?
- Solar Panels and EV Chargers: How to Charge Your Car With Sunshine
