solar-pv (Home Systems)

Solar PV

• What this is: rooftop solar photovoltaic for a BC detached home — how the system works, the honest BC ROI picture, BC Hydro’s self-generation program, what an owner maintains, and when to call a pro.
• Not: off-grid / battery-only systems; strata rooftop solar (the roof is common property — requires strata corporation approval and is outside owner scope); EV charger installation (see ev-charger (Home Systems)); the electrical panel the inverter connects to (see electrical-panel (Home Systems)).
• Figures: 2025–26 Metro Vancouver estimates — get written quotes. Solar economics shift significantly by system size, roof orientation, and shading.

Bottom line

The rule (tripwire)

• If your roof is within 5–10 years of end-of-life → re-roof first, then install solar. Mounting panels on a near-end-of-life roof means dismounting and re-mounting the entire array at additional cost when the roof fails. The prerequisite check is: what is the roof’s current condition and remaining life? → roof (Home Systems)
• If your inverter shows a fault code or the system app shows generation dropping persistently (not just on cloudy days) → call your installer. Panel or inverter faults do not self-resolve and silently erode the economic case.
• If the system was installed before July 1, 2026 without a BC Hydro rebate → you may be grandfathered on 1:1 net metering for up to 10 years from your start date. Check your interconnection agreement before making changes.

Recurring upkeep

• Monitor generation monthly via the inverter app — a persistent unexplained drop is the earliest fault signal.
• Clean panels once or twice a year (or quarterly if moss-prone) — biological growth causes 20–35% efficiency loss in Vancouver’s wet climate, and rain alone does not remove moss or algae.¹
• Visual inspection from the ground annually — check for cracked panels, shifted racking, loose wiring at the disconnect.

One-time setup

• Confirm roof age and condition with a roofing contractor before getting solar quotes. A roof inspection is the first step, not the solar installer’s quote.
• Apply for BC Hydro self-generation pre-approval before purchasing equipment — BC Hydro requires pre-approval before installation, and since June 1, 2026, rebate eligibility requires an HPCN-member installer.²
• Get 2–3 quotes from certified solar installers — scope, panel brand, inverter type, and warranty terms vary widely.
• Locate and photograph your main electrical panel — the inverter connects here; your panel’s capacity and age affect what the installer can do. → electrical-panel (Home Systems)

Standing facts

• Detached homeowners in BC can pull a homeowner electrical permit for solar — but in practice, certified solar installers pull the permit as part of their service, and BC Hydro interconnection requires a licensed contractor.³⁴
• Solar in BC has longer payback than in sunnier, higher-rate jurisdictions. BC Hydro’s Tier 1 rate (11.87 ¢/kWh) and Tier 2 rate (14.08 ¢/kWh) are among the cheapest electricity in North America, and Metro Vancouver receives fewer peak-sun-hours than the BC interior or Alberta. Expect 10–18 years payback depending on system size and roof.⁵⁶⁷
• The financial case is stronger for large loads. Homes with an EV, heat pump, or electric heating spend more at Tier 2 rates — solar’s value is highest when it offsets that expensive consumption rather than exporting at 10 ¢/kWh.⁸

How it works — the one thing that matters

Solar panels (photovoltaic cells) convert sunlight — including diffuse light on cloudy days — into DC electricity. A grid-tie inverter converts that DC into AC electricity matching the grid’s frequency and voltage, which feeds your home’s circuits directly from the panel (or the inverter’s AC output).

The load-bearing mechanism is self-consumption, not export. When your panels are generating and you are consuming, every kilowatt-hour you use from solar displaces grid electricity you’d otherwise pay for at 11.87–14.08 ¢/kWh.⁸ When you generate more than you use, the surplus flows to the grid — but under BC Hydro’s self-generation rate (effective July 1, 2026), that export earns only 10 ¢/kWh, lower than the retail rate you’d pay to import it.²⁹ This is why right-sizing to your own consumption matters more than maximising panel count.

How the billing works: a smart meter records both your imports from the grid and your exports to it. BC Hydro bills you for net imports, crediting your exports at the export rate each billing cycle. There is no annual “banking” of kWh under the new self-generation rate — credits settle each cycle.⁹

What the inverter does: the grid-tie inverter is the control brain. It synchronises output to the grid, performs safety disconnect if the grid goes down (anti-islanding — protects utility workers), monitors system output, and reports faults. Modern inverters include rapid shutdown capability as required by the Canadian Electrical Code for fire-safety.⁴ A string inverter connects all panels in series; microinverters (one per panel) operate panels independently and can suit shaded roofs better.

So what: the design decisions — panel count, roof orientation, inverter type, and whether to add a battery — all flow from one question: “how much of my own electricity will I actually consume from solar?” Size for self-consumption first, then export is a bonus. → Solar PV Export at 10 Cents Per kWh Is Weaker Than Self-Consumption (Home Systems)

BC sunshine reality: Metro Vancouver receives roughly 1,000–1,100 kWh of generation per kW of installed capacity per year.⁶ A south-facing roof with good pitch generates at the higher end; an east- or west-facing roof with shading at the lower end. BC’s lower mainland receives more annual solar radiation than Germany (the world’s former solar leader), so the technology works here — the financial case is just tighter than in sunnier, higher-rate provinces.

What goes wrong, and the warning signs

Watch for	What it means
Generation drop >10% versus same period last year (no new shading, normal weather)	Panel fault, inverter issue, or soiling/moss growth
Inverter fault code or red light	System has stopped generating — check the app, then call installer
Green / black discolouration on panels	Moss or algae — rain will not remove it; needs cleaning before further efficiency loss
Cracked panel face (visible from ground or drone)	Compromised panel — output loss + potential moisture intrusion; pro assessment needed
Racking shifted or loose (panels not level)	Roof penetration may have moved — weather seal risk + structural concern
Buzzing or burning smell at the inverter or disconnect	Electrical fault — turn off the system at the AC disconnect and DC disconnect; call installer
Water staining on ceiling below the array	Roof penetration seal has failed — roofer first, then solar installer
No generation on a clear day	Inverter offline, disconnect tripped, or grid-supply interruption — check inverter display

What actually fails (the load-bearing failures):

• Inverter failure — the most common component failure. String inverters last 10–15 years; microinverters 15–25 years. Budget one string inverter replacement over the panel’s 25–30-year life ($1,500–$3,000).¹⁰
• Biological growth (moss/algae) — Vancouver’s wet climate makes this the primary performance-robbing failure. 20–35% efficiency loss from biological fouling — far greater than dust.¹
• Roof penetration seal failure — flashing at the racking mounts is the highest-consequence leak point. A quality install seals these; an aging install may need resealing.
• Panel degradation — modern panels degrade at 0.3–0.5%/year. At 0.4%/year, a panel at year 25 still produces ~90% of its original output. Not a failure — a known slow decline.¹⁰
• Shading that wasn’t there at install — a neighbour’s tree grows, a new structure goes up. Shade on even one panel in a string drops the whole string’s output (string inverters). Microinverters or optimisers are more shade-tolerant.

When to replace vs repair

What you see	Do this
Inverter failure within warranty	Repair (warranty claim) — contact installer/manufacturer; most inverters carry 10–25 yr warranty
Inverter failure out of warranty (>10 yr old)	Replace inverter — often cost-effective to upgrade technology at same time
One cracked or underperforming panel	Replace that panel — panels are modular; one replacement doesn’t require the whole array
Soiling / moss / algae	Clean — professional cleaning ($300–$635); do not DIY on a wet roof
Roof penetration seal leaking	Repair seal — solar installer + roofer together; do not ignore (water damage compounds)
Panels at 25+ years with heavy degradation (>20% output loss)	Replace array — a full re-roof and re-array decision; treat with The Decision Lifecycle
Inverter functional but system undersized for new large load (EV, heat pump added)	Assess expansion — new panel strings and inverter capacity assessment; requires new permit

Verdict — the replace decision: a full solar array replacement or major expansion is irreversible (costs $15,000–$35,000+ before rebates) and well above $500, so it earns The Decision Lifecycle treatment. Single component replacements (one inverter, one panel) are reversible and relatively cheap — just get a quote and do it. → Solar PV Payback in BC Is 10–18 Years — Longer Than Sunnier Jurisdictions (Home Systems)

Typical cost (BC / Metro Vancouver)

Tier	What’s included	Range	Sources
DIY / parts only	Not applicable as a practical tier — BC Hydro interconnection and the electrical permit require a licensed contractor. Panels alone (parts only, no labour or permits) run $500–$800/panel; inverters $1,500–$5,000.	—	34 — indicative (limited sources)
Basic	Small system (3–5 kW), like-for-like quality panels and string inverter, licensed install, electrical permit; does not confirm inclusion of BC Hydro pre-approval admin, roof work, or panel upgrade	$12,000–$20,000 before rebates	567
Standard	6–10 kW system; licensed install; TSBC electrical permit + inspection; BC Hydro self-generation application + smart meter install; quality panels with 25-yr production warranty; string or microinverter with monitoring app; roof flashing sealed; haul-away of any old equipment	$18,000–$33,000 before rebates · net $13,000–$28,000 after $5K BC Hydro rebate + 7% PST exemption	56711
Premium / with battery	8–12 kW system + 10–14 kWh battery storage (e.g. Tesla Powerwall or equivalent); enables resilience during grid outages and maximises self-consumption; enrolled in BC Hydro Peak Saver for battery rebate	$30,000–$50,000 before rebates · net $20,000–$40,000 after solar ($5K)+battery($5K Peak Saver) rebates	25611

Metro Vancouver runs at the high end of BC ranges due to labour costs. Cost per watt of installed capacity typically runs $2.50–$3.50/W.⁵⁶⁷ Get 2–3 written quotes — quotes that exclude the BC Hydro application, TSBC permit, and roof flashing are not full-scope comparisons. The federal Canada Greener Homes Grant and Loan are both closed (grant ended March 2024; loan ended October 2025) — do not count on federal programs.¹² The 7% BC PST exemption on eligible solar equipment applies automatically at purchase.

DIY tier: not applicable in practice. A detached homeowner can technically pull a homeowner electrical permit for solar, but BC Hydro’s interconnection application and rebate program require a licensed contractor; doing the electrical yourself while separately hiring a contractor for interconnection is uncommon and complex.³⁴

How to maintain it — the procedures

Solar panels have no moving parts and require less upkeep than most home systems — but two owner tasks matter significantly in BC’s climate.

Procedure: Monthly generation monitoring — year-round

Why: a persistent, unexplained generation drop is the earliest indicator of a fault. Catching it early prevents months of lost production.

You’ll need: inverter monitoring app (provided by installer at commissioning), 2 minutes.

1. Open the inverter app (e.g. Enphase Enlighten, SolarEdge app, SMA Sunny Portal, or manufacturer equivalent).
2. Compare this month’s kWh generated to the same month last year (or to the system’s expected output if first year — your installer should provide a production estimate by month).
3. Note whether any drop coincides with unusual weather or new shading. A weather-explained dip is normal; a persistent drop without explanation is a flag.
4. Check the inverter status — look for any fault codes or warning indicators in the app.

Done when: generation is within expected range and no fault codes are showing.

Stop and call a pro if:

• Generation drops >10% versus the same period last year with no weather explanation
• Any fault code appears in the app that is not a transient grid-interruption notice
• The app shows zero generation on a clear day after 9 am
• You see a warning about a specific panel (microinverter systems show panel-level data)

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Procedure: Annual visual inspection — from the ground

Why: shifting racking, cracked panels, or damaged wiring are visible before they cause bigger problems. Do this from the ground or with binoculars — do not climb onto a wet BC roof.

You’ll need: binoculars (optional), 15–20 minutes; camera/phone to document.

1. From the ground, scan each panel for cracks, discolouration (green/black = biological growth), or broken frames.
2. Check that all panels are level and racking has not shifted.
3. Look at the roof surface around the array — any lifted shingles or flashing at the mount points?
4. Check the inverter and AC/DC disconnect boxes (outside your home) — any rust, moisture intrusion, or evidence of burning?
5. Photograph any concerns and send to your installer.

Done when: no visible panel damage, racking is level, roof surface around mounts looks intact, disconnect boxes are clean and sealed.

Stop and call a pro if:

• Any cracked, discoloured, or visibly damaged panel
• Racking appears shifted or panels are not level
• Roof flashing at mount points appears lifted or damaged
• Any rust, moisture, or burning at the inverter or disconnect

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Procedure: Panel cleaning — once or twice a year (BC standard); quarterly if moss-prone

Why: in Vancouver’s wet climate, rain cleans dust but promotes moss and algae growth. Biological fouling causes 20–35% efficiency loss.¹ Every percentage point matters more here than in sunnier regions because BC’s output is already constrained by cloud cover.

You’ll need: access to panels safely, soft-bristle brush (non-abrasive), mild soapy water (dish soap), garden hose — OR hire a professional cleaning service ($300–$635 per visit).¹

1. MUST only clean panels when you can safely reach them without climbing on a wet, mossy roof. Most Metro Vancouver homes should use a professional service — rooftop safety is the binding constraint.
2. If panels are accessible (e.g. low-slope ground-mount or accessible flat roof with proper safety): rinse with hose first, then gently scrub with soapy water and a soft brush.
3. MUST NOT use a pressure washer — high pressure damages panel seals, forces water into connections, and voids warranties.
4. Rinse clean and check that no soapy residue remains.
5. Check generation via the app within 2–3 days to confirm efficiency has improved.

Done when: panels visually clean (no green/black discolouration), generation returns to expected level for weather conditions.

Stop and call a pro if:

• You cannot safely reach the panels without ladder or roof access
• Green/black biological growth persists after cleaning (may need biocide treatment)
• You notice cracked or damaged panels during cleaning — stop and document, do not disturb

Maintenance calendar:

• Monthly: check inverter app — generation vs. expected, any fault codes.
• Annually (e.g. each April before peak summer generation): visual inspection from ground. Clean panels if accessible and needed.
• Every 6–12 months: clean panels if in a moss-prone location (North Shore, Burnaby Mountain, areas with heavy tree cover).
• At year 10–15: arrange professional inverter assessment — string inverters approach end of design life; plan replacement budget.
• At year 20–25: full system review — panel output vs. original estimate; assess whether re-array is cost-effective at roof’s next replacement.

Detached home reality

You own the system, you own the economics. On a detached home, the solar array is entirely your asset, your maintenance responsibility, and your economics — there is no strata corporation or shared-property layer. The practical implications:

• Roof decisions are yours to sequence. If your roof is aging, re-roof first. A solar array mounted on a roof that needs replacement within 10 years will need to be partially or fully dismounted and re-mounted, adding $2,000–$8,000 in labour cost for that work alone.¹¹ This is the single most common solar-related regret among BC homeowners. → Roof Age Is a Solar PV Prerequisite — Re-Roof Before Mounting Panels (Home Systems)
• Panel upgrades and system changes are your decision alone — no strata approval needed, though you must pull a new permit for any system modification that changes the interconnection.
• Insurance: contact your insurer before installation. Most standard home policies extend to cover a solar array as part of the dwelling structure, but confirm in writing — some policies treat the array as a separate scheduled item or require updating the home’s insured value. → insurance-warranties (Home Systems)
• Property tax: BC Assessment may increase your assessed value with a solar array. The increase is typically modest but worth understanding before installation.

The DIY-vs-pro line:

• Owner can do: monthly generation monitoring, annual visual inspection (from ground), panel cleaning if safely accessible, resetting a tripped AC disconnect (similar to resetting a breaker — check the manual first).
• Licensed contractor must do: all electrical work at the inverter, disconnect, or panel; all roof penetration or racking work; the BC Hydro self-generation application (requires a licensed contractor); any system expansion or modification.
• A detached homeowner can pull a homeowner electrical permit for solar — but BC Hydro’s interconnection approval and rebate eligibility (post June 1, 2026) require an HPCN-member licensed installer.³⁴ In practice, the installer pulls the permit as part of the project.

When you hire someone

Ask:

• Are you a licensed electrical contractor (TSBC-registered) and a BC Hydro HPCN member? (Required for rebate eligibility since June 1, 2026.²)
• Will you manage the BC Hydro self-generation pre-approval and interconnection application?
• What panel brand and model are you proposing, and what is the production warranty (look for 25-year linear power guarantee)?
• String inverter or microinverters — and why for my roof configuration?
• What is the rapid shutdown solution? Is it CEC-compliant?
• Is roof flashing and waterproofing at mount points included in scope?
• What monitoring app and warranty support comes with the system?
• What is the estimated annual output (kWh) for my roof, and how did you model it (shading analysis, orientation, pitch)?
• Is a battery included or available as an add-on later?
• How long until BC Hydro completes interconnection (typically 4–8 weeks after install)?

Verify the work:

• TSBC electrical permit issued before work starts
• BC Hydro pre-approval received before installation
• Inspection passed (TSBC electrical + building permit if applicable)
• Inverter monitoring app set up and showing generation
• No roof leaks in the 30 days after install (rain test)
• BC Hydro smart meter updated and self-generation account active
• Warranty documents for panels, inverter, and workmanship received
• Generation matches within ~10% of the installer’s estimate in the first full month of similar weather

Who to call

These become real when filled in the Tier-B MOCs:

• Certified solar installer (HPCN member, TSBC-licensed electrical contractor) → vendor-roster (Home Systems). Fill: company name, TSBC licence number, HPCN membership status, phone, notes on BC Hydro interconnection experience and monitoring app used.
• Roofing contractor (for pre-solar roof assessment) → vendor-roster (Home Systems). Fill: company name, phone, and written roof-age assessment before getting solar quotes.
• BC Hydro self-generation program → self-generation portal at bchydro.com/self-generation. Fill: your interconnection agreement number and start date — confirms grandfathering status.
• Insurer / broker → insurance-warranties (Home Systems). Fill: confirm the solar array is covered under dwelling coverage and the home’s insured value is updated.

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Sources

Idea Compass

North: Where this comes from

• Electrical (Home Systems) — parent system
• BC Hydro Net Metering Ended for New Customers July 2026 — Self-Generation Rate Now Applies (Home Systems) — the program that defines the export economics
• Solar PV Export at 10 Cents Per kWh Is Weaker Than Self-Consumption (Home Systems) — the load-bearing economic mechanism

East: Tensions / failure

• Solar PV Payback in BC Is 10–18 Years — Longer Than Sunnier Jurisdictions (Home Systems) — the honest ROI tension
• Roof Age Is a Solar PV Prerequisite — Re-Roof Before Mounting Panels (Home Systems) — the most common sequencing mistake
• roof (Home Systems) — the prerequisite component

South: Where this leads

• electrical-panel (Home Systems) — the panel the inverter connects to; capacity matters
• ev-charger (Home Systems) — EV charging is the large load that most improves solar self-consumption economics
• finance-replacement-reserves (Home Systems) — inverter replacement (~$1,500–$3,000 at year 10–15) belongs in reserves
• vendor-roster (Home Systems) — the certified installer named-resource card

West: What’s similar

• generator-transfer-switch (Home Systems) — another electricity-generation investment with a resilience case; different economics
• The Decision Lifecycle — the replace-vs-repair framework for array expansion or replacement

Footnotes

1. Washtech Solutions, a Vancouver window and solar cleaning company — Vancouver solar panel cleaning guide: 164 rainy days per year promote moss/algae; biological growth causes 20–35% efficiency loss; rain does not remove biological fouling; professional cleaning $300–$635; cleaning frequency 1–4× per year depending on shade and moss exposure — https://www.washtechsolution.ca/blog/solar-panel-cleaning-in-vancouver-guide ↩ ↩² ↩³ ↩⁴

2. BC Hydro, the provincial electric utility — solar and battery rebate program: $1,000/kWupto$5,000 for solar; up to $5,000 for battery with Peak Saver; HPCN-member installer required for rebate eligibility from June 1, 2026; new self-generation rate (Rate Schedule 2289) applies July 1, 2026 — https://www.bchydro.com/powersmart/residential/rebates-programs/solar-battery.html ↩ ↩² ↩³ ↩⁴

3. Technical Safety BC, the BC electrical safety regulator — homeowner electrical permits: detached homeowners can pull permits for solar; strata owners cannot — https://www.technicalsafetybc.ca/apply-for/permits/homeowner-permits/homeowner-electrical-permits ↩ ↩² ↩³ ↩⁴

4. Solar BC — BC solar permit requirements, Canadian Electrical Code (CSA C22.1:24, adopted March 2025) compliance, rapid shutdown requirements, and licensed contractor requirement for BC Hydro interconnection — https://solarbc.ca/why-your-solar-panel-permit-got-rejected-and-how-bcs-solar-codes-actually-work/ ↩ ↩² ↩³ ↩⁴ ↩⁵

5. SolarGuide Canada — Vancouver solar costs $2.80–$3.50/W; 5 kW system payback 14–18 years; 10 kW system payback 12–16 years; annual output 1,100–1,300 kWh/kW; $5Krebate+PSTexemption$2K reduce net cost — https://solarguide.ca/solar-guides/british-columbia/vancouver/ ↩ ↩² ↩³ ↩⁴ ↩⁵

6. SolarEnergies.ca, a BC solar information site — 10 kW system $20,000–$30,000 before rebates; BC Hydro Tier 1 rate 11.87 ¢/kWh; payback often 12+ years at current rates; self-consumption maximisation is the primary economic lever; FortisBC customers retain net metering — https://solarenergies.ca/solar-panels-bc-guide/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

7. GreenBuildingCanada — BC solar costs $2.50–$3.30/W; 10 kW system $25,000–$33,000 before rebates; payback 11–22 years depending on location and shading; note does not account for inverter replacement in simple payback — https://greenbuildingcanada.ca/average-cost-solar-panels-british-columbia/ ↩ ↩² ↩³ ↩⁴

8. BC Hydro, the provincial electric utility — residential tiered rates (Tier 1: 11.87 ¢/kWh; Tier 2: 14.08 ¢/kWh; flat rate option: 12.63 ¢/kWh, effective April 1, 2025; 3.75% annual increase approved) — https://app.bchydro.com/accounts-billing/rates-energy-use/electricity-rates/residential-rates.html ↩ ↩²

9. Skyfire Energy / Polaron Solar — BC Hydro net metering to self-generation transition: Rate Schedule 2289 effective July 1, 2026; exports credited at 10 ¢/kWh per billing cycle (not annually banked); non-rebate customers grandfathered 10 years; rebate recipients can repay rebate to retain net metering; estimated $75/year reduction in export credit for typical 8 kW system — https://skyfireenergy.com/bc-hydros-shift-from-net-metering-to-self-generation-what-solar-homeowners-need-to-know/ ↩ ↩²

10. SolarReviews — solar panel lifespan 25–35 years; degradation 0.3–0.5%/year (premium panels 0.25%); 90% output retained at year 25 at 0.4%/year; string inverter lifespan 10–15 years; microinverter lifespan 15–25 years; budget $1,500–$3,000 for one string inverter replacement over 25 years — https://www.solarreviews.com/blog/how-long-do-solar-panels-last ↩ ↩²

11. Xolar, a BC solar installer — 10 kW Vancouver system $28,000–$32,000 pre-rebates; net $21,000–$25,000 after $5Ksolarrebate+PSTexemption;payback10–14years;annualsavings$1,750/year — https://xolar.ca/service-areas/british-columbia/vancouver/ ↩ ↩² ↩³

12. SolarGuide Canada — Canada Greener Homes Grant ended March 2024; Canada Greener Homes Loan ended October 2025; federal solar programs closed; provincial and utility programs are the only available incentives in 2026 — https://solarguide.ca/solar-rebates/ ↩