Partial autonomy vs. complete autonomy

The word “autonomy” does not always mean the same thing.

There is a major difference between partial autonomy and complete autonomy, also called off-grid.

Understanding this distinction helps prevent oversizing and overpaying for a system.

01–02

Two very different levels of autonomy

GRID-CONNECTED

Partial autonomy

You remain connected to the electrical grid. Solar panels generate electricity; some is used immediately and the surplus can be stored or exported to the grid.

Goal

Reduce the bill and provide a certain level of backup.

Advantages

More reasonable cost
Fewer batteries required
Simpler system
The grid remains a safety net

Limitations

You still depend on the grid
During a long outage, autonomy remains limited

OFF-GRID

Complete autonomy

You are no longer connected to the grid. All electricity must be generated and stored on site.

Goal

Operate without depending on Hydro-Québec.

Advantages

Complete independence
Ideal for remote sites

Disadvantages

Much higher cost
Very precise sizing is required
A backup generator is often required
More complex management, especially in winter

Which option should you choose?

Situation	Recommendation
Home in a city or suburb	Partial autonomy
Accessible cabin with grid service	Partial autonomy
Remote cabin without grid service	Complete autonomy
RV / Camper van	Onboard autonomy by design
Limited budget	Partial autonomy
Desire for complete independence	Complete autonomy

DECISION GUIDELINE

Complete autonomy is not a default objective.

For most residential situations in Quebec, partial autonomy offers the best balance of cost, simplicity and results.

Complete autonomy is most justified when the grid is unavailable or prohibitively expensive to extend.

CLARIFY THE NEED

Unsure which level of autonomy to target?

Describe your situation to clarify the level of autonomy actually required.

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