November 11, 2025 · by Larry Dahl
The short version: the most reliable off-grid setup in Canada is solar + batteries + a generator, tied together by a smart inverter-charger that runs on sun first and auto-starts the generator only when the batteries get low. Size the generator to both carry your loads and charge the bank, and it'll sip fuel the rest of the year.
There's a romantic idea that off-grid means 100% solar, never touching a drop of fuel. I've lived off-grid for 25 years, and I'll tell you straight: the most reliable, best-value off-grid systems in Canada pair solar with a generator. Not because solar can't do the job most of the year — it easily can — but because December in Canada is a real thing, and a generator turns "mostly reliable" into "always on." Here's how the two work together.
Let the inverter do the thinking
The magic isn't the generator, it's the inverter-charger that ties everything together. A good one runs your house off solar and batteries all day, watches the battery level, and when the bank drops to a set point it starts the generator on its own. Then it does two jobs at once — powers the house and recharges the batteries — and shuts the generator off when the bank is full. You're not out there in a parka pull-starting anything. The system just handles it.
Size the generator to do two jobs
The most common mistake I see is a generator that's too small. It has to carry your biggest simultaneous load and push a healthy charge into the battery bank at the same time. For a lot of homes that lands in the 7 to 12 kW range. Too small and it strains and never quite catches up; too big and it burns fuel loafing along at 10% load. Match it to your inverter's charge capacity and your real loads, and it'll run efficiently.
Auto-start is what makes it hands-off
If you're away for a week and a dark stretch rolls in, an auto-start generator wired to the inverter keeps the lights on without anyone home. This is the feature that separates a true "set it and forget it" off-grid home from one you have to babysit. Our backup generators are chosen to play nicely with the inverters we install for exactly this reason.
You'll burn less fuel than you think
People picture a generator droning away all winter. In a properly sized hybrid, it barely runs. Solar carries the load through most of the year; the generator only fills the gaps in the darkest weeks and during long cloudy spells. Pair it with a battery bank sized for a normal Canadian winter and the fuel bill stays small.
Building one for your place
A good hybrid is a matched set — panels, batteries, inverter, and generator all sized to work together. Get one piece wrong and the whole thing feels unreliable. If you're planning an off-grid build, tell us about the property and your loads and we'll spec it so it just works, winter included.
Frequently asked questions
Can you run solar and a generator together?
Yes, and for serious off-grid in Canada it's the most reliable setup there is. A modern inverter-charger runs your loads from solar and batteries first, then starts the generator automatically when the batteries get low, uses it to both power the house and recharge the bank, and shuts it off again. You mostly forget it's there.
What size generator do I need for an off-grid solar system?
Big enough to carry your largest simultaneous load and charge the battery bank at the same time — for many homes that's a 7–12 kW unit. Too small and it strains trying to charge; oversized and it burns fuel loafing. Match it to your inverter's charge capacity and your real loads.
Will the generator start itself when the batteries run low?
With an auto-start generator wired to a capable inverter-charger, yes. The inverter watches battery voltage and starts the generator on a low threshold, then stops it once the bank is topped up. It's the feature that lets an off-grid home run itself through a dark week while you're away.
How much fuel will the generator actually use?
In a well-sized hybrid, far less than people expect — the generator only runs to cover the gaps solar can't, mostly in the darkest weeks. Most of the year it barely turns over. That's the whole point of pairing them: solar does the heavy lifting, the generator just fills in.
Not sure what your site can handle?
Every property is different — trees, roof pitch, how much of the year you're actually out there. Send us the details and we'll help you get it right. No pressure, no hard sell.