Grid-Tied vs Off-Grid Solar in Canada — Which Should You Choose?
For 95% of Canadian homeowners, grid-tied solar is the obvious answer — cheaper, simpler, and more productive. Off-grid makes sense in a narrow set of cases: remote properties without grid access, or cottage builds where extending the grid would cost $30k+. Here's the actual comparison.
The three options
Grid-tied (no battery)
Your solar system connects to the utility grid. When you produce more than you use, exports feed the grid; when you produce less, you draw from the grid. No batteries. Cheapest per kWh delivered.
Grid-tied + battery (hybrid)
Same as grid-tied, but adds a battery for either backup power during outages or to store your own solar for later self-consumption. Higher upfront cost; useful when export credits are much lower than retail (BC, Manitoba, Saskatchewan).
Off-grid
No grid connection at all. Solar + large battery bank + backup generator (usually) provides all electricity. Requires strict energy discipline and about 3x the battery capacity of a hybrid system.
The head-to-head comparison
| Factor | Grid-tied | Hybrid | Off-grid |
|---|---|---|---|
| 10 kW system cost | $27,000 | $41,000 | $65,000+ |
| Battery included | None | 1× (~13 kWh) | 3–4× (~40+ kWh) |
| Backup during outages | No | Yes (partial) | Yes (full) |
| Payback period | 8–14 yrs | 12–18 yrs | N/A (no bill offset) |
| Requires generator | No | Optional | Almost always |
| Suits | 95% of homes | Frequent outages / low export rates | Remote/no grid access |
When off-grid actually makes sense
Off-grid is the right answer in three specific situations:
- Grid extension to your property would cost $20,000+ (rural cabin, remote acreage, off-highway lot). At $20k+ for grid drop, off-grid solar competes on capital cost.
- You're building a seasonal cottage used 3–5 months/year. Battery discipline is easier when you're not depending on it year-round.
- You value energy independence beyond financial payback — some homeowners choose off-grid as a lifestyle preference, not an ROI decision.
The middle ground: hybrid systems
Hybrid systems (grid-tied + battery) are gaining ground in Canada as extreme weather increases outage frequency. A single Tesla Powerwall or LG RESU (~13 kWh) adds $14,000 to install cost and provides:
- 8–24 hours of backup power for critical loads (fridge, furnace fan, some lights) during outages
- Self-consumption of your own solar in low-export-credit provinces (BC, Manitoba, Saskatchewan)
- Peak-shifting if you're on time-of-use rates (Ontario, some Alberta plans)
- Nothing extra during normal grid operation — batteries don't reduce your bill unless the economics above apply
Whether the $14k battery pays back depends heavily on your province. In Ontario or Nova Scotia with 1:1 net metering, batteries mostly serve as backup power insurance. In BC or Manitoba with low export credits, batteries do add measurable savings — usually shortening payback by 1–3 years vs pure grid-tied.
Common myths
Myth: Grid-tied solar keeps working during outages
It doesn't. Grid-tied inverters are required by safety code to shut down when the grid goes down (to protect utility linemen). Without a battery + islanding inverter, your solar system is offline during outages even if the sun is shining. This surprises many first-time buyers.
Myth: Off-grid means no electric bill
True, but you're spending an extra $12–$18k on batteries and typically $2,000+ on a backup generator and its fuel. Amortized over 15 years, that's often more per month than a modest grid connection with grid-tied solar covering most usage.
Myth: Batteries always shorten payback
In provinces with 1:1 net metering, batteries do not shorten payback — they lengthen it, because you're paying $14k up front to avoid exporting kWh that were already being credited at full retail. Batteries only improve payback where export credit is much lower than retail.
Frequently Asked Questions
Is grid-tied solar cheaper than off-grid?
Yes — significantly. A 10 kW grid-tied system costs about $27,000 in Canada; a comparable off-grid system with battery bank and generator runs $60,000+. Grid-tied wins on cost, complexity, and productivity for any property with grid access.
Do solar panels work during a power outage?
Grid-tied solar systems automatically shut down during power outages for safety reasons (to protect utility workers). To keep your panels producing during outages, you need a battery backup system with an islanding inverter — added cost of $14,000–$18,000 for a single-battery setup.
Can I go partially off-grid?
Yes — that's what a hybrid system does. Grid-tied panels plus a battery gives you day-to-day grid connection (for net metering) and outage backup on the same system. Most homeowners who want backup power choose hybrid rather than full off-grid.
How much battery capacity do I need?
For outage backup only, 10–15 kWh (one battery) covers critical loads for 12–24 hours. For heavy self-consumption in low-export-credit provinces, 25–30 kWh. For full off-grid, plan on 40–60 kWh of usable battery capacity plus a backup generator.
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