In short: The Maple Leaf Northern Fox AIO FLEX kit is an all-in-one home battery backup system: a 9.6 kW or 11.4 kW Fox ESS hybrid solar inverter and 8 to 28 kWh of stackable LiFePO4 battery in one tidy stack, with the optional Fox ESS Hub G2 for whole-home backup. It switches to battery in under 10 ms when the grid fails, charges from solar or the grid, and carries a 15-year total warranty. A 12 kWh system with the Hub is $10,200 CAD, about $10,000 for a system of similar size to one Tesla Powerwall 3 (see the comparison). Engineered, warrantied and repaired in Canada by Solar Power Store Canada in Barrie, Ontario.
Why Northern Fox instead of a plain Fox ESS system?
Northern Fox is the Fox ESS platform engineered, sold and supported in Canada by Maple Leaf Power Systems at Solar Power Store Canada, 526 Bryne Drive, Barrie, Ontario. You get proven Fox ESS hardware, and you deal with one reputable Canadian company from sizing to warranty:
- Official Fox ESS partner with engineering access in Barrie. As an official Fox ESS partner, our Barrie office has direct engineering access, so design, set-up and troubleshooting questions are answered by people who know your system.
- Warranty claims and repairs handled in Canada. We act on Northern Fox warranty claims and repairs ourselves, so you are not left chasing a manufacturer in another country.
- 15-year total warranty. 12.5-year manufacturer warranty plus 2.5 years of extended coverage from Maple Leaf Power Systems.
- Certified for Canadian code. UL9540 and UL9540A certified LiFePO4 storage with UL1741 and CSA certified equipment.
Questions? Call our Barrie team at 1-888-421-5354 or email hello@solarpowerstore.ca.
DOWNLOADS:
For Fox AIO Hybrid Inverter:
- Datasheet
- Certification - UL1741
- Certification - UL9540 - CoFC
- Certification - UL9540A Test Report
- Quick Guide
For Fox ESS Hub G2 (Optional):
BUNDLE OVERVIEW:
Fox ESS AIO (All-in-One) Flex inverter & battery kits deliver a complete, future-ready solar energy solution in a single, intelligent platform. By combining high power output, modular lithium battery storage and a smart hybrid inverter, this system empowers homeowners and businesses to take control of their energy, reduce utility costs, and maintain power security, without complexity.
Modular design allows battery capacity to expand from 8 kWh to 28 kWh simply by adding additional plug-and-play batteries to the stack. Up to 7 battery modules in total can be used per inverter, but larger systems can also be enabled by linking multiple inverter/battery stacks together.
The optional Fox ESS Hub G2 smart energy management system enhances flexibility in a variety of applications, allowing homeowners to build the perfect whole-home or partial-home backup solution for their needs.
KEY FEATURES:
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All-in-One ESS System (Hybrid Inverter + Battery in One Unit) – Simplifies installation and reduces system complexity, giving you lower install costs, a cleaner setup, and higher long-term reliability.
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High Power Output (9.6kW / 11.4kW) – Enough power to run everything in your home for peace-of-mind and reliable operation, even during outages.
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Modular & Scalable Battery Storage – Allows you to add more battery capacity as your needs grow, protecting your investment with a flexible, future-ready system.
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Hybrid Solar Inverter & Backup-Ready Hub Compatibility – Works seamlessly with solar, batteries, and the utility grid, giving you total energy independence and system versatility.
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Optional Fox ESS Hub G2 – Delivers additional functionality for whole-home backup, partial-home backup, and energy management applications.
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Fast Backup Switching (<10ms) – Transfers power almost instantly during grid failure, keeping sensitive electronics running without interruption.
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Smart Energy Management & Monitoring – Provides real-time control via app and web, letting you track production, usage, and savings anytime, anywhere.
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High-Efficiency Lithium Battery Technology – Delivers long cycle life and deep discharge, so you get more usable energy and a higher return on investment.
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Time-of-Use Optimization – Automatically shifts charging and discharging based on electricity rates, reducing your monthly power bills without manual control.
COMPATIBLE RAPID SHUTDOWN SYSTEMS
Fox ESS systems are compatible with supported rapid shutdown solutions for enhanced PV system safety and code compliance.
- APsmart Rapid Shutdown Compatibility – View the official APsmart inverter compatibility information.
- Tigo Rapid Shutdown Compatibility – View the official Fox/Tigo compatibility documentation.
Frequently Asked Questions
What is the difference between the AIO FLEX and the FLEX kit?
Both use the same Fox ESS platform, sizes (8 to 28 kWh) and 15-year warranty. The AIO FLEX stacks the inverter and batteries into one all-in-one unit for a cleaner, simpler install. The FLEX kit mounts the inverter on the wall with the battery stack beside it, and costs a little less.
How much storage do I need?
For essentials (fridge, furnace fan, sump pump, internet, lights) most homes are comfortable with 12 to 16 kWh. For whole-home backup or long outages, choose 20 to 28 kWh. Battery modules plug into the stack, so you can add more later, up to 7 per inverter. Our guide How Much Battery Storage Does Your Home Need? walks through the math.
Do I need the Fox ESS Hub G2?
Choose the Hub if you want whole-home backup or a generator connection. The Hub G2 manages the switch between grid, battery, solar and generator. Without it, the kit backs up the circuits you choose from a backup subpanel.
How does it compare with a Tesla Powerwall 3?
A 12 kWh AIO FLEX with the Hub is $10,200, about $10,000 for a similar-size system. Canadian guides quote Tesla's list price of C$10,974 per Powerwall 3 plus C$1,165 for the Gateway, before installation. The AIO FLEX expands to 28 kWh on one inverter and is warrantied and repaired in Canada. Read the full Powerwall alternatives comparison.
Does it work without solar panels?
Yes. It charges from the grid and holds the battery ready for outages, and time-of-use settings can charge it when power is cheap. Add solar panels any time.
Who handles warranty and repairs?
We do. Northern Fox systems carry a 15-year total warranty (12.5 years from the manufacturer plus 2.5 years from Maple Leaf Power Systems), and our team in Barrie, Ontario acts on warranty claims and repairs directly. Call 1-888-421-5354 or email hello@solarpowerstore.ca.
Can I install it myself?
Connecting a battery system to your home's electrical panel needs an electrical permit and inspection (ESA in Ontario). We ship kits to you or directly to the homeowner for your own licensed electrician to install, or we can help arrange the installation.