TYPHOON-READY SOLAR · CEBU

Solar panels and typhoons: only as strong as their fixings.

Can solar panels withstand Cebu’s tropical storms? The panels themselves rarely give way first. In studies of hurricane-hit rooftops, loose clamps and bolts let whole rows go. Here is how a typhoon-ready installation is designed, fixed and checked, what it can’t protect against, and what to do before and after a storm.

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When the wind picks up
Illustration: a Cebu house with six solar panels in a storm, rain and wind lashing the roof and a palm bending, with the panel mounting highlighted.
Wind pulls up on the panels. The mounting carries that pull into the roof frame, which is where typhoon-ready design starts.
  • Mounting, highlighted
Illustration
The short answer

Well-installed panels can come through strong typhoons, but no system is typhoon-proof. What decides it is the mounting: brackets fixed through to the purlins, slab or rafters; clamps only where the panel’s manual allows, with nuts that can’t work loose; panels kept about a metre back from roof edges; stainless hardware near the sea; and a design to the NSCP 2015 wind speed for your address, checked every year.

Even then, Signal No. 4–5 winds, flying debris, a failing roof or floodwater can damage any system. After a storm, stay off the roof and treat every panel and cable as live: panels make electricity whenever there is daylight.

THE HONEST ANSWER

Are solar panels typhoon-proof? No. Here’s what decides it.

“Typhoon-proof” is the phrase people search for, and the one promise no installer can keep. What you can ask for is a system designed, fixed and maintained for the winds your roof will see.

Nobody can test a rooftop system against every typhoon, so “typhoon-proof” is a slogan, not a specification. PAGASA’s impact wording for Signal No. 5 says well-constructed houses may suffer substantial roof and wall failure. A panel is never more secure than the roof it is fixed to.

The best evidence on what actually fails comes from the 2017 Caribbean hurricanes. In the US Virgin Islands, FEMA’s investigators found rows of panels torn away while the mounts beneath them held: the clamps had let go, and many of their nuts “could be freely spun”. RMI, studying rooftop systems after the 2017–2019 Atlantic hurricanes, saw top-down clamps fail in “96 percent of the systems” it observed. And one house in FEMA’s report, with clips anchored through its corrugated metal roof into the structure, had no damage at all.

So the useful question is not “are the panels strong enough?” but “is every link from the panel to the roof frame designed, fixed and checked?” The figure follows that chain.

How wind load travels from a solar panel into the roof frameSide view of two panels on a rail over a corrugated metal roof. Wind suction pulls the panels upward. The load passes from the panels into the clamps, the rail, the brackets, the screws into the purlins, and the truss. Five numbered points mark where systems fail.12345
Illustration, not to scale: a side view along one rail. The dashed gold line is the load path, from the clamp through the rail and bracket into the purlin and truss.
  1. Panel

    Rarely the first part to fail when it is clamped where its manual allows.

  2. Clamps and their bolts

    The usual failure. Nuts work loose, and a clamp shared by two panels can let both go.

  3. Rail and splice bolts

    Undersized or under-torqued bolts with nothing to stop them backing off.

  4. Bracket fixing

    Must pass through the roof sheet into the purlin or rafter, never into the sheet alone.

  5. Roof sheet and frame

    Screws pull out of the purlin, or the sheet tears over the screw heads. The array adds uplift here.

Already have panels up? The storm-readiness checklist shows which links to have looked at first. It takes about two minutes, from the ground.

Check my system’s weak links

HOW IT’S BUILT

How a typhoon-ready installation is built, stage by stage.

Six stages, from the wind assessment to the yearly check. Read them as a specification for a new system, or as the questions to ask about the one already on your roof.

How a typhoon-ready installation is built

01 / 06
Your roof, in a stormA visual guide
Storm clouds over a bare roof: exposure and structure come before any panel.
  • The part in focus
Illustration

Chapter 01

Stage 1 · Before any design

First, the wind, and the roof it will act on.

The design starts from the NSCP 2015 wind speed for your address, read by the engineer from the code’s wind maps, with the site’s exposure (sheltered suburb, open ground or shoreline) and the roof’s height and shape. This page prints no single “Cebu = X km/h” figure, because the value belongs to the site.

NSCP 2015 follows the US ASCE 7-10 standard, which has no rules written for rooftop solar, so careful designers also check the newer rooftop-PV provisions and use whichever gives higher loads, as FEMA recommends. Then the roof itself: purlins, truss connections, rust, sheet fastening, and whether it will outlast the panels.

The standard
A stated wind basis, exposure and roof-frame check before the layout is drawn.
Ask for
The design wind basis in writing, and who checked the roof structure.

A layout that keeps panels out of the roof’s highest-pressure edges and corners.

At your pace. Select any chapter.

Planning a system? Ask for all six stages in writing, in any quote, ours included. Scenes are illustrations, not photos of an installation. For the whole journey see how solar works, or how a home solar installation runs from site assessment to handover.

Request a proposal

CHECK YOURS

Storm-readiness checklist: which links to check first.

For a system already on your roof or one you’re planning. Answer from the ground and never climb up to look. You get a prioritised list and a straight answer on whether to ask for a safety assessment.

Storm-readiness checklist

Answer from the ground. Never climb onto the roof to check.
Book a check soon

Example system: Book a safety check before the next typhoon. 1 to act on, 3 to check, 4 with no flags.

See actions

Showing an example system. Change any answer to make it yours.

Your system

Is the system installed, or are you planning one?
How old is it?

Your roof and site

What is the roof made of?
How far is the roof from the sea?

A map app’s distance tool gives a good enough figure.

How exposed is the site to wind?
What condition is the roof in?

What you can see

When was it last checked by a technician?
Anything you can see from the ground or a window?

Tick all that apply, or none. Use binoculars or a phone zoom; don’t go up.

Equipment and records

Where is the inverter (and battery, if you have one)?
Do you have the design records?

Panel layout, wiring diagram, fixing details and the design wind basis.

Example system · storm readiness

Book a check soon

Book a safety check before the next typhoon.

1 act3 check4 no flags

The chain, from panel to paperwork

  1. PanelsNo flags

    Nothing reported.

  2. Clamps and railsCheck

    No clamp check for over two years; nuts can work loose.

  3. Roof fixingsCheck

    Not visible from the ground: confirm each bracket goes through the sheet into a purlin, not the sheet alone.

  4. Roof and frameNo flags

    Sound roof on a sheltered site.

  5. Metals and saltAct

    Rust on load-bearing parts weakens them; replace, don’t paint over.

  6. Cables and connectorsNo flags

    Nothing reported.

  7. Inverter and batteryNo flags

    Dry location; keep it above any future flood line.

  8. Design recordsCheck

    Without records, the next check starts from scratch.

What to do, in order

Before the next typhoon

  1. Have the rust assessed and corroded parts replacedRusted bolts and brackets lose strength. Replace them with stainless parts, isolated from aluminium rails.
  2. Book the overdue clamp and torque checkFEMA advises checking every panel clamp with a torque wrench each year, and spot-checking the rail bolts.
  3. Inspect connectors and fasteners for salt corrosionBetween 50 and 500 m of the sea, connectors need protecting; within about a kilometre, stainless (A4/316) hardware is common practice.

At the yearly check

  1. Confirm how the array is fixed to your roofEach bracket should go through the sheet into a purlin, never into the sheet alone.
  2. Ask for the design recordsLayout, wiring diagram, fixing details and the wind basis, so every future check starts from the facts.
  3. Before each typhoonBefore any signal, or at Signal No. 1 at the latest: clear loose things from the roof deck and yard and charge the battery if you have one. Leave roof-level work to professionals, and stay off the roof once the wind picks up.

Should you ask for a safety assessment?

Yes: request a safety assessment in the coming weeks, while the weather is calm.

Request a solar safety assessmentAdding a battery for typhoon outages

A checklist, not an inspection: it flags what to have looked at first, and it cannot tell you a system is safe. Distances follow the panel maker’s manual we checked (Jinko, Dec 2023); other brands set their own limits.

PANEL LOAD RATINGS

What “5,400 Pa” on a datasheet does and doesn’t mean.

Panel load ratings come from a static lab test. They’re useful for comparing panels, and easy to oversell as a wind rating.

Under IEC 61215, the international test standard for panels, a module is clamped as its manual specifies and a uniform load is pressed on its front, then on its back, held for an hour each way, for three cycles. It passes if no circuit opens during the test, there is no major visible damage and it still passes a wet insulation test.

The test load is the design load times a safety factor of at least 1.5. So a panel listed at +5,400 / −2,400 Pa has design loads of 3,600 Pa pushing on the front and 1,600 Pa on the back. In a typhoon it is the back load that matters: wind suction pulls panels away from the roof.

What the test is not is a wind test. Typhoon loads are gusty, uneven and last for hours, and they peak at the edges of an array. There is no honest way to turn pascals into a “rated for 250 km/h” claim, and the rating is void if the panel is clamped outside its zones.

Front (push)+5,400 Patest · 3,600 Pa design

Rear (uplift)−2,400 Patest · 1,600 Pa design

In plain numbers. A 1,600 Pa design uplift on one 2.70 m² panel is a pull of about 4.3 kN, roughly the weight of 440 kg. Spread over 4 clamps, about 1.1 kN each. That is why the clamps, and the fixings behind them, matter more than the glass.

Our arithmetic from the datasheet values, for illustration. Real wind loads are uneven and highest at edges and corners.

What panel ratings mean, and what they don’t
On the datasheetWhat it meansWhat it does not mean
+5,400 Pa frontWithstood a 5,400 Pa uniform push (design load 3,600 Pa), clamped as the manual specifies.Anything about wind speed, or strength when clamped elsewhere.
−2,400 Pa rearWithstood a 2,400 Pa uniform uplift (design load 1,600 Pa).“Typhoon rated”, “withstands 250 km/h”, or resistance to hours of gusting, debris or loosening clamps.
IEC 61701Passed a salt-mist corrosion test; severity 1 is meant for marine and near-sea use.That the rails, bolts and connectors around it are corrosion-proof.
FM 4478 “VSH” (where listed)Passed a very-severe-hail impact test.Resistance to heavy flying debris, as FEMA points out.

BEFORE YOU SIGN

Typhoon claims, and what to ask for instead.

Storm marketing tends to promise what nobody can test. These are the lines to question, in our quotes as much as anyone’s.

Typhoon claims compared with what you can check
If you hear…Why it falls shortAsk for this instead
“Typhoon-proof”Untestable. PAGASA says even well-built houses can suffer substantial damage at Signal No. 5.Mounting designed to the NSCP 2015 wind speed for your address, with the basis stated in the proposal.
“Rated for 250 km/h”Panel ratings are pascals from a static test. What a system can take depends on the site, the roof zone and the fixings.The design wind speed and exposure category the engineer used for your site.
“5,400 Pa means typhoon-tested”The test is static and uniform, an hour per side. The uplift rating is usually 2,400 Pa.Both test loads, and where the manual allows the clamps to go.
“NSCP-certified” or “PAGASA-approved” panelsNeither body certifies rooftop solar products in this way.Electrical plans sealed by a Professional Electrical Engineer, and structural sign-off where your city requires it.
“Our systems survived Odette”We found no documented record of how rooftop solar fared in Cebu.Dated photos or records from the installer’s own systems.
“Maintenance-free”Coastal air is highly corrosive, and nuts can loosen. FEMA advises a yearly clamp and corrosion check.A yearly check of every clamp’s torque, the fasteners, cables and corrosion.
“It switches off by itself after a storm”Panels produce power whenever there is daylight.A written post-storm procedure: stay off the roof, isolate at the inverter if safe, test before restart.
“Rapid-shutdown compliant” or “arc-fault protected”Only true if the devices, or the inverter’s arc-fault option, are actually installed.The exact devices, listed in the quote.

Want the mounting spelled out line by line? Our estimates itemise mounting, cabling and protection separately: ₱4,000 per panel, about 14% of the 5.58 kWp system with 1 battery our calculator suggests for a ₱10,000 monthly VECO bill (₱14.89/kWh, Sep 2026). What the line covers for your roof is listed in the proposal. For the rest of the quote, use our guide to comparing solar quotes.

Get an itemised quote

CEBU’S TYPHOONS

Signal No. 4, twice in four years: what Cebu’s storms tell us.

About 20 tropical cyclones enter the Philippine Area of Responsibility each year, and 8 or 9 of them cross the country (PAGASA). Two recent ones put Metro Cebu under Signal No. 4.

≈20tropical cyclones a yearin the PAR; 8 or 9 cross the country (PAGASA)

12 hnotice at Signal No. 436 h at Signal No. 1

8+ daysCarcar without powerafter Odette, Dec 2021 (SunStar)

≈7.4%of VECO customers still outfive days after Tino, Nov 2025 (SunStar)

PAGASA wind signals, and two Cebu typhoons

Sustained winds Gusts (km/h)

Odette: 175 km/h sustained, gusts to 240 km/h; Tino: 150 km/h sustained, gusts to 205 km/h.

Odette (Rai) · 16 Dec 2021

Tino (Kalmaegi) · 4 Nov 2025

  1. No. 139–61 km/h36 h notice
  2. No. 262–88 km/h24 h notice
  3. No. 389–117 km/h18 h notice
  4. No. 4118–184 km/h12 h notice
  5. No. 5185+ km/h12 h notice
Signal bands as used since 23 March 2022, drawn at equal width (not to scale). Winds are PAGASA’s bulletin figures near the centre: Odette at its Carcar landfall, Tino over the waters off Camotes before its Borbon landfall. Odette’s own warnings used the older scale. Signal bands describe sustained winds; gusts are shown for reference only and do not set the signal.

16 Dec 2021 · Typhoon Odette (Rai)

Odette: a direct hit on southern Cebu

At landfall
Near Carcar at 10:00 p.m., with 175 km/h sustained winds and gusts to 240 km/h (PAGASA).
Warnings
Signal No. 4 over central and southern Cebu, including Cebu City, Mandaue, Lapu-Lapu, Cordova, Talisay and Carcar, on the pre-2022 scale (171–220 km/h).
Afterwards
Carcar’s LGU reported 80% of homes badly damaged. Carcar was still without power on 24 December, at least eight days later; CEBECO I had restored only parts of Ginatilan and Samboan by 22 December.

For solar: outages can outlast a week after a direct hit. That is the case for battery backup, and for an array still on the roof when the power returns. Solar for CEBECO customers covers southern and northern Cebu.

4 Nov 2025 · Typhoon Tino (Kalmaegi)

Tino: typhoon winds, then floodwater

At landfall
Borbon, northern Cebu. Over the waters off Camotes, PAGASA gave 150 km/h sustained winds with gusts to 205 km/h.
Warnings
Signal No. 4 (118–184 km/h) over northern and central Cebu, including Cebu City, Mandaue, Lapu-Lapu, Talisay, Danao, Liloan and Bogo.
Afterwards
The Office of Civil Defense counted 150 deaths in Cebu (interim, 11 Nov 2025). Widespread flooding trapped people on their roofs, and Liloan alone recorded 35 deaths (Inquirer, 6 Nov 2025). About 1.4 million households, mostly in the Visayas, had power interruptions (DOE). Five days on, about 7.4% of Visayan Electric customers were still without power (92.57% restored by 9 November 2025).

For solar: mount the inverter and battery above any credible flood level, never in a ground-floor garage in a barangay that floods. Solar for VECO customers covers Metro Cebu.

PAGASA winds and building-code wind speeds are different measures

Bulletins give sustained winds near a storm’s centre and a separate gust figure. The NSCP design speed is a 3-second gust at a standard height over open ground, read from the code’s maps for each site. The two can’t be compared directly, which is one more reason this page prints no “rated for X km/h” figure.

What we don’t know

We found no documented record of how rooftop solar fared in Cebu during Odette or Tino. So we make no claims about it, for our installations or anyone else’s.

COASTAL CEBU

Salt air: the slow storm.

A typhoon tests a system for a day; salt tests it every day. On Mactan, the islands and Cebu’s coastal barangays, distance from the shore changes the hardware list.

  1. Under 50 mMarine-rated modules onlyStandard modules are not meant for this zone. The representative manual sends you to the maker for offshore or marine modules.Panel maker’s manual
  2. 50–500 mProtect the connectorsCap connectors and connect them at once, and add anti-rust measures to the metalwork.Panel maker’s manual
  3. 500 m–1 kmStainless all throughA4/316 stainless fasteners and isolation between dissimilar metals are common practice this close to salt air.Engineering practice
  4. Beyond 1 kmStandard hardware, yearly lookStainless fasteners and aluminium rails, with corrosion checked at the yearly inspection.Engineering practice

Coastal tropical air is among the harshest settings for metal. A June 2026 pv magazine analysis of coastal solar notes that many such sites fall in ISO 9223’s C5 (“very high”) corrosion class, that 316 stainless steel, with 2–3% molybdenum, outperforms 304, and that “the least compatible component sets the service life of the assembly.” One plain-steel washer can undo a stainless design.

If you are in Lapu-Lapu or Cordova, our guide for MECO customers covers the utility side of going solar on Mactan.

  • Stainless, the right grade. A4/316 fasteners close to the sea; stainless earthing bolts, nuts and washers everywhere.
  • Isolate different metals. Isolating washers or bimetallic lugs between aluminium, galvanised steel and copper.
  • Protect connectors. Capped until connected, connected at once, kept off the roof surface.
  • Look every year. White powder on aluminium, rust streaks on bolts and green copper are early signs.

HONEST LIMITS

What no installation can promise.

Good design lowers the risk; it doesn’t remove it. These are the limits we would want explained to us.

Flying debris

Roof sheets, branches and signboards become projectiles. FEMA recorded panels damaged by a collapsed antenna, and notes that even the strictest hail rating is not resistance to heavy debris.

The roof under the panels

An array can’t hold a roof down. At Signal No. 4, PAGASA warns that some well-constructed houses may suffer major roof failure; at No. 5, substantial roof and wall failure. If the roof goes, the panels go with it.

Floodwater

The inverter is IP65, protected against water jets, not built to sit in a flood. Tino showed how fast floodwater can rise in Cebu, so the inverter and battery belong above flood level.

Days without the grid

A grid-tied inverter must shut down when the grid fails. Only circuits on a hybrid inverter’s backup output keep running: one 5.12 kWh battery covers about 7 hours of essentials at about 0.5 kW (our estimate: about 3.7 kWh delivered per battery), and an aircon on backup calls for two. See battery backup for brownouts, or adding a battery to existing solar.

Lightning

Surge protection limits the damage from nearby strikes and grid surges. It does not make equipment immune to a direct strike.

Live in daylight

No switch turns a panel off while the sun is up. Isolating at the inverter breaks the circuit, but panels and their cables can still carry voltage, and the battery stays energised.

BEFORE AND AFTER

Before the signal, and after the storm.

PAGASA gives 36 hours’ notice at Signal No. 1 and only 12 at Signal No. 4. Act early, and keep off the roof once the wind picks up.

Before: keyed to the signals

  1. Calm months

    Yearly check of clamps, fixings, cables and corrosion. Trim branches over the roof. Find the shutdown steps on the label at your inverter and photograph them.

  2. Signal No. 1 · 36 h notice

    Clear loose objects from the roof deck, balconies and yard, and clear gutters and drains. If you have a battery, charge it fully; your inverter’s manual shows how to raise the backup reserve.

  3. Signal No. 2 · 24 h notice

    The last window for any professional work at roof level. If the inverter or battery sits on a ground floor that floods, have a licensed electrician isolate it before water arrives.

  4. Signal No. 3 and above

    Stay indoors and off the roof. Keep backup power for the essentials: lights, fans, the fridge, phones and Wi-Fi.

After: the safety script

  1. Don’t climb onto the roof.Not even to check a panel that looks loose.
  2. Treat panels and cables as live.As Energy Safe Victoria puts it, panels “can produce energy during daylight hours… even if the power is turned off”.
  3. Keep away from damage.Don’t touch damaged panels, hanging cables or wet equipment, and keep children and pets clear.
  4. Isolate only if it’s safe and dry.Follow the shutdown steps on the label at the inverter. If anything is wet or damaged, leave it.
  5. Call a licensed electrician or your installer.Don’t restart a system whose roof, panels or wiring were damaged until it has been tested.
  6. Photograph from the ground.Photos help the technician, and any insurance claim.

What a post-storm inspection should cover

Drawn from FEMA’s guidance, the panel maker’s manual and the inverter datasheet.

  • Missing, shifted or cracked panels, and broken glass
  • Every clamp: engagement and torque, and any bolt that wobbles by hand
  • Rail-to-bracket and bracket-to-purlin fixings, the sheet around each one, flashings and leaks
  • DC cables and connectors: chafing, pulled connectors, water in junction boxes
  • Insulation and earth-continuity tests before the system is switched back on
  • Inverter and battery: water inside, the flood line, enclosure damage, surge-protector status
  • A torque re-check a few months later
Book a post-storm safety check

STRAIGHT ANSWERS

Typhoon questions, answered straight.

The objections we hear most about solar and storms, with the evidence behind each answer.

More guides on roofs, batteries and quotes are in the solar guides hub.

01Are solar panels typhoon-proof?

No. No solar panel or mounting system is typhoon-proof, and an installer who says so is making a promise nobody can test. PAGASA’s impact wording for Signal No. 5 says even well-constructed houses may suffer substantial roof and wall failure.

What you can ask for is a typhoon-ready installation: mounting designed to the NSCP 2015 wind speed for your address, fixed through to the roof structure, clamped only where the panel maker allows, kept back from roof edges and checked every year. In studies of hurricane-hit rooftops, the panels themselves rarely failed first; loose clamps and bolts did.

02Can solar panels survive a Signal No. 4 typhoon in Cebu?

A well-designed, well-maintained system has a good chance, but nobody can promise it. Today’s Signal No. 4 means typhoon-force winds of 118–184 km/h, and PAGASA says most well-constructed houses may suffer minor to moderate roof damage, with some major roof failures. Metro Cebu was under Signal No. 4 for Tino in November 2025, and for Odette in December 2021, when the Signal No. 4 range was 171–220 km/h.

We found no documented record of how rooftop solar fared in Cebu in either storm, so we make no “survived Odette” claims. What decides the outcome is the fixings, the roof underneath and flying debris.

03Should I take my solar panels down before a typhoon?

No. Taking panels down means working on a roof in rising wind, handling equipment that is live in daylight, and leaving open fixings that can leak. A properly installed array is designed to stay where it is.

Instead, have the clamps and fixings checked in calm weather. Clear loose objects from the roof deck and yard before any signal is raised, or at Signal No. 1 at the latest, and charge the battery if you have one. Leave any roof-level work to professionals, who should finish it by Signal No. 2.

04Will solar panels make my roof more likely to be damaged in a storm?

They add load, so the roof has to be checked first. Wind pulls up on the panels, and that pull travels through the brackets into the purlins and trusses. If brackets are fixed only to the roof sheet, or the purlins are rusted or undersized, the array can add to the damage instead of resisting it.

That is why a typhoon-ready installation starts with the roof frame and its remaining life, keeps panels about a metre back from edges and corners where uplift is strongest, and fixes every bracket into the structure. If the roof is due for replacement, replace it before the panels go up.

05Is it safe to use my solar system after a typhoon?

Only once it has been checked, if anything looks damaged. Stay off the roof, keep away from damaged panels and cables, and remember that panels make electricity whenever there is daylight, even with the grid down. If the equipment is dry and you can reach it safely, shut the system down using the steps on the label at the inverter, then call a licensed electrician or your installer.

If nothing is damaged, a hybrid system with a battery can keep its backup circuits running while the grid is down. A grid-tied system without a battery shuts itself down until the grid returns; that is a safety requirement, not a fault.

06We live near the sea on Mactan. Can we still have solar?

Usually, yes, with the right parts. Salt air attacks fasteners, rails and connectors, so near the coast you want stainless steel fasteners (A4/316 is the usual grade close to the sea), aluminium rails isolated from other metals, and connectors protected from salt. Panel makers also set distance limits: the manual we checked sets 50 m from the shore as the minimum for standard modules and asks for extra connector protection from 50 to 500 m.

Tell us roughly how far the roof is from the shore when you ask for a quote. It changes the hardware list.

07How often should a solar system be checked for typhoons?

Once a year, and again after any strong storm. FEMA’s guidance after the 2017 Caribbean hurricanes is to check every panel clamp with a torque wrench each year, spot-check the rail bolts, look for corrosion and loosening, and re-check torque a few months after a storm.

A good time is before the last months of the year: Odette and Tino, the two recent typhoons that put Metro Cebu under Signal No. 4, struck in December and November.

08Does a typhoon-ready installation cost more?

Somewhat, mostly in hardware and time: more fixings into the structure, locking nuts, torque checks and, near the sea, better stainless steel. RMI estimated that hurricane-resilient design adds about 5% to the cost of commercial projects in its Caribbean work; that figure does not transfer directly to Cebu homes.

In our itemised estimates, mounting, cabling and protection is its own line at ₱4,000 per panel: about 14% of the 5.58 kWp system with 1 battery our calculator suggests for a ₱10,000 monthly VECO bill. What that line includes for your roof (fastener grade, locking hardware, any external surge protectors) is listed in your proposal, and site-specific extras, such as marine-grade hardware or roof repairs, are confirmed there after the site assessment.

THREE WAYS TO MOVE FORWARD

Calm weather is
the time to check.

Ask for a safety assessment of the system you have, a proposal for one you’re planning, or put a question to a person. A short summary of your checklist result travels with your request.

Route B

Request a solar safety assessment

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ROUTES B & C · TALK TO US

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Every quotation follows a site assessment of your roof, wiring and priorities, so the price you approve is the price of the system you get.

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For an existing system or a planned one. Tell us where the house is and what’s on the roof, and we’ll call to arrange a visit.

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Sources & assumptions

Reviewed 16 October 2026 · Mounting share recalculated from our calculator’s prices; VECO rate ₱14.89/kWh (Sep 2026)

  1. PAGASA, Tropical Cyclone Wind Signal (undated page; thresholds in use since 23 Mar 2022) (opens in a new tab)

    Signal ranges, lead times (36/24/18/12/12 h) and impact wording for roofs.

  2. PAGASA, Tropical cyclone information (undated page) (opens in a new tab)

    “With the average of 20 TCs in this region per year, with about 8 or 9 of them crossing the Philippines.”

  3. PAGASA Tropical Cyclone Bulletin #14, Typhoon Odette (16 Dec 2021, 11 p.m.; Internet Archive mirror) (opens in a new tab)

    Carcar landfall at 10 p.m., 175 km/h sustained, gusts to 240 km/h; Signal No. 4 areas in Cebu.

  4. PAGASA Tropical Cyclone Bulletin #12, Typhoon Tino (4 Nov 2025, 5 a.m.; Internet Archive mirror) (opens in a new tab)

    150 km/h sustained, gusts to 205 km/h over the waters off Camotes; Signal No. 4 areas. Bulletin #13 gives the Borbon landfall.

  5. Wikipedia, Tropical Cyclone Wind Signals (accessed 16 Oct 2026) (opens in a new tab)

    Secondary source for the pre-23-March-2022 ranges (Signal No. 4 = 171–220 km/h) that applied to Odette.

  6. SunStar, “80% of Carcar homes ‘badly damaged’ by Odette” (25 Dec 2021) (opens in a new tab)

    Carcar LGU and CEBECO I statements: no power in Carcar on 24 Dec; partial restoration in Ginatilan and Samboan by 22 Dec.

  7. SunStar, “Visayan Electric: 93% of Metro Cebu now back on power” (9 Nov 2025) (opens in a new tab)

    92.57% of customers restored per a VECO advisory of 9 Nov 2025, so about 7.4% still without power.

  8. SunStar, “Typhoon Tino fatalities now at 232” (11 Nov 2025) (opens in a new tab)

    OCD interim figures: 150 deaths in Cebu.

  9. Philippine Daily Inquirer via Asia News Network (6 Nov 2025) (opens in a new tab)

    Widespread flooding that trapped people on their roofs; 35 deaths in Liloan alone; about 1.4 million households “experienced power interruptions” (DOE Usec. Felix William Fuentebella).

  10. FEMA, USVI Recovery Advisory 5: Rooftop Solar Panel Attachment (Apr 2018, rev. Aug 2018) (opens in a new tab)

    Observed clamp failures and freely spinning nuts; double-nutting and self-locking nuts; mechanical anchoring, not ballast or adhesive; FM 4478 VSH; yearly check of 100% of clamps; the through-fixed corrugated-roof example; ASCE 7-10 has no PV-specific criteria.

  11. RMI, “Solar Under Storm Part II: Designing Hurricane-Resilient PV Systems” (18 Feb 2020) (opens in a new tab)

    Top-down clips observed failing “in 96 percent of the systems” (no denominator given); single-module clips or through-bolting; about 5% added cost for commercial projects.

  12. RMI, “Solar Under Storm” (20 Jun 2018) (opens in a new tab)

    Traits of failed systems: clamp failures, undersized and under-torqued bolts, no bolt locking.

  13. Song, Galasso & Garciano, “WARP²: Wind Assessment of Roofs to Pullout & Pullover”, ICASP13 (26–30 May 2019) (opens in a new tab)

    Peer-reviewed conference paper: Philippine roof sheets fail by fastener pull-out from the purlin or pull-over of the sheet. The repository could not be re-opened on 16 Oct 2026; we use none of its wind speeds.

  14. Sinovoltaics, “IEC 61215 MQT 16: Static Mechanical Load Test” (20 Jul 2026) (opens in a new tab)

    Test load ≥ 1.5 × design load; 1,600 Pa minimum design load; one hour per side, three cycles. The IEC text itself is paywalled.

  15. JinkoSolar, Installation manual for PV modules v23.12.10 (Dec 2023) (opens in a new tab)

    Used as a representative 620 W-class manual: long-side clamping at A/4 ± 50 mm, at least four clamps, +5,400/−2,400 Pa test loads; 50 m minimum from the seashore and connector protection from 50 to 500 m; stainless grounding hardware. The brand of our panel is confirmed in your proposal.

  16. IEC 61701, salt mist corrosion testing of PV modules (standard abstract) (opens in a new tab)

    Severity 1 is for modules used in a marine environment or close to the sea.

  17. pv magazine USA, “Salt does not negotiate: a corrosion design framework for coastal PV and BESS” (4 Jun 2026) (opens in a new tab)

    Opinion piece: ISO 9223 C5 for many tropical coastal sites; 316 outperforms 304 stainless; dissimilar-metal interfaces.

  18. Deye, SUN-3.6/5/6/7/7.6/8/10K-SG05LP1 datasheet (Sep 2026) (opens in a new tab)

    IP65; derating above 45 °C; DC switch; Type II SPD on DC and AC; AFCI optional. EU variant; the exact model in your proposal may differ.

  19. Republic Act 7920, New Electrical Engineering Law (24 Feb 1995) (opens in a new tab)

    A Professional Electrical Engineer has sole authority to seal electrical plans (Sec. 31(a)); no installation without sealed plans and a permit (Sec. 34).

  20. SkyCiv, NSCP 2015 wind load calculations (updated 4 Sep 2026) (opens in a new tab)

    “NSCP 2015 is based on ASCE 7-10 wind load calculations.”

  21. AEDO Construction, NSCP 2015 wind load lookup (28 May 2026, updated 17 Sep 2026) (opens in a new tab)

    Secondary: map speeds are 3-second gusts at 10 m in open terrain, read per occupancy category. We print no Cebu figure; the engineer reads it for the site.

  22. Filipino Engineer, PEC 2017 and rooftop solar rapid shutdown (18–19 Dec 2022) (opens in a new tab)

    Secondary transcription of PEC 2017 Art. 6.90 rapid-shutdown text; to be confirmed against the IIEE edition.

  23. Energy Safe Victoria, Storms and energy safety (reviewed 9 May 2024) (opens in a new tab)

    “Solar panels can produce energy during daylight hours… even if the power is turned off”; isolate only if safe; call a licensed electrician.

  24. ERC Resolution 15 s.2025, Amended Net-Metering Rules (copy hosted by Visayan Electric) (opens in a new tab)

    Grid-connected systems must not keep feeding a de-energised grid (anti-islanding).

BEFORE THE NEXT SIGNAL

A storm is the wrong time
to find a loose clamp.

Have the clamps, fixings, cables and equipment location checked while the weather is calm or, if you’re planning a system, ask for a proposal that states its wind basis. No obligation.

Request a solar safety assessmentCheck my storm readiness

YOUR NEXT QUESTION

Each guide answers one question properly, with the numbers and sources behind it.

Guide

Is my roof suitable for solar?

Space, roof type, direction, shade and structure, with a quick checklist before your site assessment.

Read the guideGuide

How to compare solar quotes

A line-by-line checklist for equipment, warranties, protection, permits and hidden costs.

Read the guideGuide

Home solar installation

From site assessment and design to installation, permits, handover and after-sales support.

Read the guideGuide

Battery backup for brownouts

What keeps running when the grid fails, how long a battery lasts, and how backup circuits are set up.

Read the guideGuide

Add a battery to existing solar

Whether your current inverter can take a battery, what an upgrade involves and what it might cost.

Read the guide
A Cebu house with rooftop solar panels keeps its lights on during a brownout

A brighter beginning
for your home.

THE INTRO OFFER

A little sunshine.
A little extra saving.

Get up to
₱50,000 off

10% off your estimated installed system price, up to ₱50,000. Final pricing follows a site assessment.