Solar Warranty Questions to Ask Before Signing: 2026 Indonesia

When you're committing Rp 100 to 300 million to a solar system for your Bali villa or home in Indonesia, the installation itself takes four to seven days. The warranty is supposed to run for 25 years. Most buyers spend their energy on the four days and barely skim the warranty paperwork. That's the wrong ratio.

The pattern we see repeatedly: a buyer comes to us after install, something's wrong at year three, and we ask to see the warranty terms. Either they're verbal-only, or the contract has a single line that says "1-year warranty" with no scope. That line doesn't hold up. Here are the 12 specific questions to ask before you sign, so you don't end up in that situation.

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These questions aren't meant to make you suspicious of your installer. Most installers in Indonesia are doing honest work. The goal is to make sure the commitments that exist verbally during the sales conversation also exist on paper in a form you can enforce if you need to.

TL;DR

• Solar systems have four separate warranty layers: panel product (12 to 15 years), panel linear power (25 years), inverter (5 to 10 years), and installer workmanship (1 to 5 years). All four must be in your written contract.
• The most commonly missing clause: workmanship coverage for roof penetrations and waterproofing. Many installers exclude this by default. If it's not explicitly named, it's not covered.
• Inverter extended warranty (5 to 10 year extension, typically Rp 2 to 5 million) should go into the original quote. Adding it after commissioning costs more and is sometimes unavailable.
• Parts lead time is the real measure of warranty quality. Indonesian distributor stock means days. Factory-China shipping means weeks. Ask which one your installer uses.
• CV- and perorangan-registered installers close at 30 to 50% rates within five years in Indonesia. Manufacturer warranties survive their closure. Workmanship warranty doesn't.
• Things that void coverage: marketplace-sourced parts, DIY modifications, unauthorized firmware updates, third-party servicing. Know this list before anyone touches your system.

The four warranty layers you're actually dealing with

Most buyers think "warranty" is one thing. It isn't. A properly documented residential solar install in Indonesia has four distinct warranty layers, each with different durations, claim processes, and responsible parties.

Panel product warranty (12 to 15 years). Covers manufacturing defects: physical failure, cracking under normal conditions, delamination, frame corrosion, or junction box failure. The responsible party is the panel manufacturer, through their authorized Indonesian distributor. Jinko, LONGi, Trina, and Canadian Solar all maintain distributor channels in Indonesia. If your panels came through an unofficial marketplace seller rather than an authorized distributor, the local warranty team has no record of the sale and the claim goes nowhere, even if the panels are identical hardware.

Panel linear power warranty (25 years). Covers degradation. Tier-1 panels guarantee production of at least 80 to 87.5% of rated output by year 25. The real degradation curve looks like this: roughly 2 to 3% drop in year one as cells stabilize (light-induced degradation), then about 0.5% per year after that. In Indonesia's tropical climate, real-world degradation runs slightly higher at 0.55 to 0.6% per year. A 580 Wp panel at year 25 should still produce approximately 460 to 505 Wp. Claiming this requires long-term production logs from your monitoring app, so keep them.

Inverter warranty (5 to 10 years). Standard for residential Tier-1 hybrids (Deye, Sungrow, Growatt, Luxpower) is five years. Extension to 10 years is available at install time for Rp 2 to 5 million. For a Rp 20 to 35 million inverter, paying Rp 3 million to double the warranty period is straightforward math. The extension is nearly impossible to add after commissioning at most brands, so it has to go into the original quote.

Workmanship warranty (1 to 5 years from installer). Covers what the installer controls: cable routing, mounting frame integrity, roof penetration sealing, terminal connections, system commissioning. Industry standard in Indonesia is one year. Quality installers offer two to five years. The duration matters less than whether the specific scope is written clearly in the contract, particularly around waterproofing.

Questions 1 to 6: product warranties

Question 1: Can I see the official warranty document, not just the data sheet?

The product data sheet tells you efficiency specs. The warranty document tells you what you can actually claim, year-by-year degradation floors, and void conditions. Jinko, LONGi, Trina, and Canadian Solar all publish official warranty PDFs. Ask for the specific panel model, then find or request the document. If the installer gives you a generic brochure instead, that's not the warranty terms.

Question 2: Who is the official Indonesian distributor for these panels and this inverter?

Get a name and contact for each major component. When you have a claim at year seven, you'll contact the distributor directly, not the installer. A credible installer can name their distributors immediately and give you contact details at handover. If they can't, that's a flag about how they're sourcing the equipment.

Question 3: What is the inverter warranty duration, and what does the 10-year extension cost?

Standard five years, extension typically Rp 2 to 5 million. Add it to the quote at signing. Post-commissioning requests cost more and are sometimes unavailable. The years six to 10 period is when most inverter failures occur. Protecting that window is worth the small upfront cost.

Question 4: What are the battery warranty terms in both years and cycle count?

You need both numbers. "5-year warranty" with no cycle clause can leave you exposed if the system cycles the battery twice daily, which is common in Bali villas with heavy overnight AC load and morning peak usage. At two cycles per day, 6,000 cycles is reached in about eight years, not 16. Ask the installer to estimate your expected daily cycle count based on the system design.

Question 5: What specifically voids each warranty layer?

Common panel voids: marketplace purchase from a non-authorized seller, DIY modifications, non-OEM repair parts. Battery voids often add a thermal condition: operating above 45 to 50C ambient repeatedly. An unventilated outdoor cabinet in direct Bali sun easily hits 55 to 60C. If your battery is going outdoors, confirm the thermal void condition in writing before you agree to that placement.

Question 6: Where do replacement parts come from, and what's the lead time?

Indonesian distributor stock: two to 14 days for most established brands. Factory-China shipping: three to eight weeks. When your inverter fails during a rental booking, that difference is real income. Ask specifically about inverter boards and battery modules. A credible installer who has processed warranty claims can tell you exactly where their parts come from.

Questions 7 to 12: workmanship, escalation, and installer risk

Question 7: What does the workmanship warranty cover, and what is the exact scope in writing?

The clause must name: cable runs, mounting structure, roof penetration points, waterproofing materials and method, terminal connections, grounding. "Standard installation warranty" without a scope list is not enforceable. Get the scope in the contract, not in a WhatsApp message.

Question 8: Does the workmanship warranty explicitly cover roof penetrations and waterproofing?

This is the most important question on the list. Roof leaks from solar installs are the most common post-install dispute in Indonesia. Many contracts cover "installation defects" but let installers argue that a leak was caused by the roof itself rather than the penetration sealing. Your contract should specifically state that the installer is responsible for waterproofing at all panel mount penetration points for the full workmanship term. If they resist adding that language, that tells you exactly how they'll respond to a leak claim at year two.

Question 9: Is there a free site visit within the first year?

Reputable installers include a check-up at six to 12 months: re-torque mounting bolts, verify MPPT string outputs match commissioning baseline, inspect roof sealing after the first wet season, tighten any loose cable management. If it's not in the quote, ask for it as a written line item. An installer who won't commit to a post-install visit is telling you something about how they handle service.

Question 10: Walk me through what happens if the inverter fails at year four.

Make them describe it concretely: who you call, what documentation you prepare, how long the inspection takes, who covers shipping and swap labor, and what the realistic timeline to resolution is. A credible installer who has handled real warranty claims answers this in three sentences. Vague answers or "just call us and we'll figure it out" is a flag.

Question 11: What happens to my warranties if your company closes before the warranty period ends?

For manufacturer warranties (panels, inverter, battery): the answer is clean. Those run between you and the brand, not through the installer. You go directly to the distributor. For workmanship: if the installer closes, you have two practical options, YLKI complaint and BPSK arbitration. Having the installer's full legal entity name, PT registration number, and physical office address in your contract makes that process significantly faster. If the contract only has a phone number and a WhatsApp, that's a problem.

Question 12: Are you a PT, CV, or perorangan, and how long have you operated under this entity?

PT companies carry stronger legal accountability than CV or sole-trader operators under Indonesian commercial law. Small CV and perorangan solar installers close at high rates in Indonesia, particularly two to four years after founding. A five-year workmanship warranty from a sole trader who closes at year three is practically unenforceable. Ask for the PT registration number and verify it yourself at ahu.go.id. A PT with five-plus years of continuous operation and a physical address you can find on Google Maps is your real protection against that scenario.

When this doesn't fully protect you

These 12 questions give you strong footing. They don't make warranty enforcement automatic in Indonesia.

Warranty enforcement quality is uneven here. Brands with eight-plus years of Indonesia market presence tend to process claims in one to two weeks. Newer entrants with thinner local teams can take months, not because they're acting in bad faith, but because their Indonesia service infrastructure isn't built yet. We'd rather tell you this upfront than have you find out at year six.

For Bali villa owners in remote areas (Amed, Munduk, far Uluwatu), factor in whether your installer will actually send a crew for a warranty visit. Travel time and logistics for remote locations sometimes lead installers to delay or avoid warranty service they technically owe you. Ask specifically about their service coverage for your area before you sign, not after.

And finally, for systems at Rp 200 million and above, having an Indonesian lawyer review the full contract before signing is worth the Rp 2 to 5 million it costs. A two-page contract that leaves scope ambiguous on a 25-year commitment is the wrong place to save money.

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