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KAJK Constructors

Solar energy solutions in Ottawa

KAJK Constructors designs, builds and installs seven kinds of solar and energy work in Ottawa and across Ontario: residential solar, commercial and industrial solar, ground mounts, lithium battery storage, solar carports, EV charging stations and green retrofits. Several can share one property, so a single free assessment can look at them together. The homepage shows how a solar panel installation in Ottawa runs, step by step.

Book a free assessment(613) 869-8254
KAJK installers laying racking on an Orléans roof, seen from a drone

What each service covers

  1. Black solar panels on a shingled roof in Orléans, seen from a drone

    Residential solar

    Residential solar panels: rooftop solar for homes, as a solar-only setup or solar backup with battery storage, grid-tied or off-grid. The design starts from a cable and equipment power-loss calculation and site modelling.

    Residential solar
  3. Rows of ground-mounted solar panels in a field

    Ground mounts

    Ground mount solar panels: arrays on their own racking, fixed, adjusted with the seasons or on trackers that follow the sun, for homes, businesses and industrial sites anywhere in Ontario. KAJK designs, builds, repairs and maintains them.

    Ground mounts
  4. A solar inverter and a battery cabinet mounted on a plywood backboard

    Lithium battery storage

    Solar battery storage: lithium battery systems from small residential to large commercial and industrial, to keep power on through outages and to use stored solar in place of on-peak grid power.

    Battery storage
  5. A solar carport over a paved parking space

    Solar carports

    Solar carports at homes and businesses: carports roofed with solar panels, sized to supply the building or the EV chargers parked underneath.

    Solar carports
  6. An electric car plugged into a wall charger

    EV charging stations

    EV charger installation for home and workplace chargers, with a site assessment and design recommendations, plus guidance on EV incentives. With solar on the same property, part of the charging comes from your own panels.

    EV charging
  7. Top-down drone view of a row of Orléans homes, one with solar panels

    Green retrofits

    Green retrofits: a planned route to a net zero home or building across the building envelope, electrical, mechanical and civil work, built on KAJK's principles of losing less energy, using less and making more.

    Green retrofits

Rooftop or ground mount: which suits the site?

The same panels can go on a roof or on the ground; what changes is the angle the structure allows. Natural Resources Canada's Ottawa figures show what the angle is worth: a south-facing array at latitude tilt yields 1,200 kWh per kW a year, panels laid flat 977, and a two-axis tracker 1,667.

Rooftop

  • Uses roof space you already have, with no footings or trenching
  • The roof's pitch and direction set the angle, and with it the output
  • The roof has to last under the panels: CanREA asks buyers whether theirs will hold up for 20 years

Ground mount

  • Needs open, sunny land, such as a rural lot, a farm or an industrial site
  • The angle is a choice: fixed, adjusted with the seasons, or tracking
  • A two-axis tracker lifts Ottawa output from 1,200 to 1,667 kWh per kW (NRCan)
  • Leaves the roof alone, so a re-roof never involves the panels

Where a carport fits, and how the pieces combine

A solar carport is the third route when the roof won't work and the yard is spoken for. It shelters a driveway or rows of parking, and with the panels directly over the cars it suits EV charging.

KAJK's company history describes full energy management systems that combine a renewable source with battery storage and heating and cooling, monitored by a central energy management system. On a smaller scale, a battery holds the afternoon's output for the evening and a charger can put some of it into the car.

Combining pieces can change the paperwork. Hydro Ottawa connects systems of 12 kW AC or less through a micro-generation Service Request; above that, it asks for a Preliminary Consultation and then a Connection Impact Assessment stamped by a professional engineer licensed in Ontario.

Our process is simple

If you need solar energy solutions, we'll be there from conception to completion. We have the experience and accreditation to lead the way in all phases of your solar project. Here's what you can expect.

  1. Consultation

    From your initial assessment to project management, budgeting, scheduling and acquiring your permits, we handle all major aspects of your project.

  2. Procurement

    We acquire the best quality materials for your project at the lowest cost possible, giving you the best value for your dollar.

  3. Design

    We design your solar project to ensure that it meets your needs in the most affordable way possible. We do it all, including system designs to as-built drawings.

  4. Construction

    Our project manager leads all construction projects to ensure that installation, construction and maintenance projects go smoothly and efficiently.

Questions we get asked

How much do solar panels cost for a 2,000 square foot house in Canada?

Floor area doesn't set the price; electricity use does. A home at the Ontario Energy Board's typical 700 kWh a month uses 8,400 kWh a year, which needs about 7 kW of panels at Natural Resources Canada's Ottawa output of 1,200 kWh per kW. For a published price point, Hydro Ottawa's 2024 customer story reports a 14.4 kW rooftop system costing just over $30,000 plus HST, before panel upgrade and connection costs.

What is the 20% rule for solar panels?

A seller's rule of thumb: size the array about 20% above your use to cover losses. Ontario's net metering regulation and Hydro Ottawa's connection rules don't contain it. In Ottawa it double-counts, because Natural Resources Canada's 1,200 kWh per kW figure already allows for losses, and net-metering credit carried through 12 straight months of bills resets to $0. Size from a year of real use instead.

Which setup makes the most power per panel in Ottawa?

A two-axis tracker that follows the sun. Natural Resources Canada rates it at 1,667 kWh per kW a year in Ottawa, against 1,200 for a fixed south-facing array at latitude tilt and 977 for flat panels. Trackers are a ground-mount option; on a roof, the pitch and direction you have set the output, which is why the assessment models your actual roof.

Is there a solar incentive for businesses in Ontario?

Yes. Save on Energy's Retrofit Program pays commercial, industrial and institutional sites for behind-the-meter solar: $1,000 per kW DC for systems up to 10 kW, and $770 per kW AC above 10 kW AC up to 1 MW AC (read 2026-10-01). The application has to go in before you sign a binding commitment, so book the assessment first. Terms change; the incentives page tracks them.

Do I need a battery to go solar?

No. A grid-tied system runs without one and banks its surplus as net-metering credit. A battery earns its place when you want power through an outage, since panels alone shut off when the grid does, or when you would rather use stored solar than buy on-peak power. KAJK installs both setups, and the assessment shows which fits your use.

Sources for this page (10), last read 2026-10-01
  1. Municipality database: photovoltaic potential (kWh/kWp), CSVNatural Resources Canada, read 2026-10-01
  2. Photovoltaic potential and solar resource maps of CanadaNatural Resources Canada, read 2026-10-01
  3. Choosing Your InstallerCanadian Renewable Energy Association, read 2026-10-01
  4. How Solar WorksCanadian Renewable Energy Association, read 2026-10-01
  5. DER connection processHydro Ottawa, read 2026-10-01
  6. A homeowner harnesses the power of the sun (blog, 2024-02-20)Hydro Ottawa, read 2026-10-01
  7. Backgrounder: Regulated Price Plan, 2025-10-17Ontario Energy Board, read 2026-10-01
  8. O. Reg. 541/05, Net MeteringGovernment of Ontario (e-Laws), read 2026-10-01
  9. What Is the 20% Rule for Solar Panels? (2026-08-11)BLUETTI, read 2026-10-01
  10. Solar Photovoltaic incentives with the Retrofit programSave on Energy (IESO), read 2026-10-01

Contact Ottawa's solar energy experts

Ready to get started? Give us a call or send us a quick message for all your solar and green energy needs. The free assessment looks at your roof or site, your last year of electricity use and what you want the system to do, then comes back with a concept design, costs and the equipment we would use.

Book a free assessment(613) 869-8254

Monday to Friday, 9 a.m. to 5 p.m.
Saturday and Sunday: by appointment