Choosing the right solar installer in Selangor is critical — you're trusting them with a RM 20,000-30,000 investment that must perform for decades. This guide sets out seven criteria for comparing SEDA-registered solar companies in Selangor: registration, track record, warranties, equipment, reviews, pricing transparency and after-sales support.
How to Choose a Solar Company: 7 Criteria
1. SEDA Registration (RPVSP)
Installers that handle Solar ATAP applications must be registered with the Sustainable Energy Development Authority (SEDA) as a Registered PV Service Provider (RPVSP). Without a registered provider, your Solar ATAP application cannot go ahead.
How to verify:
- Check SEDA's official portal: myseda.seda.gov.my
- Look for the RPVSP registration number on quotations (Trexon's is SEDA-RPVSP-2026/373)
- Ask who designs the system and who signs off the electrical work
Red Flag: If a company cannot give you its SEDA RPVSP number, walk away.
2. Installation Portfolio & Track Record
Ask for proof of completed work and customer references. Look for:
- Residential projects: Terrace houses, semi-Ds, bungalows
- Commercial projects: Factories, warehouses, retail
- Completed Solar ATAP applications: Proof of TNB commissioning
- Years in operation: Check the company's incorporation date with SSM
3. Warranty Coverage (Panel + Inverter + Workmanship)
Ask for each warranty in writing:
- Solar Panels: the maker's performance and product warranties (Trexon packages: 30-year performance, 12-year product)
- Inverters: 10-year manufacturer warranty from established brands
- Workmanship: the installer's own warranty covering roof leaks and wiring issues caused by the installation (Trexon: 5 years)
Important: A long panel warranty is of little use if the installer closes down in 3 years. Check the company's records with Suruhanjaya Syarikat Malaysia (SSM).
4. Panel & Inverter Brands Used
Tier 1 brands (market reference; Trexon itself installs Jinko panels with Solis, Huawei or Sungrow inverters, the others on request only):
- Panels: Longi, Trina, Jinko, Canadian Solar, JA Solar
- Inverters: Huawei, Sungrow, Solis, SMA, Fronius, SolarEdge
Avoid no-name brands from Alibaba/Lazada. If the installer can't tell you the exact panel model (e.g., "Jinko Tiger Neo 620W"), it's a red flag.
5. Customer Reviews & Testimonials
Check multiple sources:
- Google Business Profile: Detailed reviews, not just star ratings
- Facebook Page: Real customer photos (not stock images)
- Lowyat Forum: Search company name in Solar Energy subforum
Warning: Some companies pay for fake 5★ reviews. Look for detailed reviews mentioning specific staff names, installation dates, and technical details (e.g., "Encik Ahmad installed our 6kW Longi system on Dec 15, panels are generating 25-28 kWh/day").
6. Pricing Transparency & No Hidden Fees
A trustworthy installer provides itemized quotations showing:
- Panel brand, model, wattage, and quantity
- Inverter brand, model, and capacity
- Mounting structure type (aluminum rail, kliplok, ballasted)
- Solar ATAP application
- TNB meter commissioning cost
- Monitoring system (app access)
Possible extra costs to ask about:
- Scaffolding for buildings of 3 storeys or more
- Roof reinforcement for weak roofs
- Earthing upgrade for older homes
- Three-phase supply for systems above 7.44 kWp (the 5 kWac single-phase limit)
7. After-Sales Support & Maintenance
Solar systems need minimal maintenance, but when issues arise (inverter fault, panel cracking), support matters:
- Monitoring: App access to check real-time generation
- Remote diagnosis: Inverter error code interpretation via phone/WhatsApp
- On-site visits: Ask how fault visits are arranged and what they cost after the warranty
- Panel cleaning: Ask whether it is included or a paid plan (Trexon: Essential Care, RM 500/year)
About Trexon Energy
We do not rank other installers in this guide. Apply the seven criteria above to every company on your shortlist, Trexon included.
Trexon Energy at a Glance
- Incorporated: 2013 (SEDA-registered PV service provider, registration SEDA-RPVSP-2026/373)
- Specialization: Residential (terrace, semi-D, bungalow)
- Panels Used: Jinko Tiger Neo 620W
- Inverters Used: Solis (base), Huawei (+RM3,000), Sungrow (+RM5,000)
- Warranty: 30-year panel performance, 12-year panel product, 10-year inverter, 5-year workmanship
- Solar ATAP: application handled by us end to end
- Customer Review Highlights:
- "Installed 6kW in Kota Kemuning. 3 months in, generating 26-29 kWh daily. Bill dropped from RM 580 to RM 95." — Siti Rahimah, Dec 2025
- "Trexon handled the entire Solar ATAP registration and process. Bill dropped from RM 580 to under RM 100." — David Lim, Jan 2026
- Areas Served in Selangor: Shah Alam, Petaling Jaya, Subang Jaya, Klang, Puchong, Ampang, Cheras, Kajang
For every company, verify the SEDA registration, ask for the exact panel and inverter models, get the warranty terms in writing and speak to past customers.
Red Flags: Solar Companies to Avoid
1. No SEDA Registration
If they claim "registration pending" or "processing," ask for the RPVSP number and check it on the SEDA portal before you pay anything.
2. Unverifiable Installation Portfolio
Ask for customer references you can contact. If they refuse or give only Facebook testimonials (no contact info), walk away.
3. Pressure Sales Tactics
"Offer expires today," "Last ATAP slot," "Limited stock" — these are artificial urgency tactics. Take the time you need to compare written quotations.
4. Cash-Only, No Contract
All solar contracts must be in writing with:
- Itemized component list (panel models, inverter specs)
- Installation timeline (start date, completion date)
- Payment schedule (the booking fee, then milestone payments)
- Warranty terms (who honors it, claim process)
5. Large Upfront Payment Demanded
Be wary of any installer who asks for most or all of the price before work starts. Ask for a written payment schedule tied to milestones (approval, material delivery, installation and commissioning), and find out exactly what any booking fee covers and whether it is refundable.
6. Generic "High-Efficiency" Panels Without Brand
If the quotation says "550W High-Efficiency Solar Panel" without specifying Longi/Trina/Jinko, they may be using unknown brands without a reliable warranty.
How to Verify a Solar Installer's Credentials
Step 1: Check SEDA Registration
- Visit myseda.seda.gov.my
- Search by company name or RPVSP registration number
- Check that the registration is current
Step 2: Verify SSM Company Registration
- Go to SSM Company Search
- Enter the company's registered name
- Check "Status: Existing" and the incorporation date
Step 3: Google Business Profile Review Analysis
- Search "Company Name + Solar Selangor" on Google
- Check if reviews mention specific projects (e.g., "6kW Longi in Shah Alam")
- Look for response from owner to negative reviews (shows accountability)
Price Comparison: What You Should Pay (Selangor 2026)
Trexon's catalogue prices for residential systems (Solis; Huawei adds RM3,000, Sungrow adds RM5,000): 5.58 kWp RM 19,499, 6.20 kWp RM 19,999, 8.06 kWp RM 21,999, 9.92 kWp RM 24,999, 12.40 kWp RM 28,999. Compare any quotation by RM per watt and by what it includes.
What to compare between quotations:
- Panels: exact brand, model and wattage
- Inverter: exact brand and model, and whether it is string or hybrid
- Warranty: panel performance, inverter and workmanship terms in writing
- Monitoring and maintenance: what is included and what costs extra
FAQ: Choosing a Solar Company in Selangor
How do I choose a solar company in Selangor?
Shortlist SEDA-registered installers (RPVSP), then compare itemised quotations, written warranty terms and customer references. Trexon Energy is a SEDA-registered installer (SEDA-RPVSP-2026/373) for homes in Selangor, with a 30-year panel performance, 10-year inverter and 5-year workmanship warranty.
How do I verify if a solar company is registered?
Check SEDA's official portal (myseda.seda.gov.my) for the company's RPVSP registration. Also verify their SSM company registration.
What is a good solar panel warranty in Malaysia?
Look for a written panel performance warranty from a Tier-1 maker, a 10-year inverter warranty and at least 5 years of workmanship cover. Trexon warranty: 30-year panel performance, 12-year panel product, 10-year inverter and 5-year workmanship.
Can I negotiate solar panel prices in Selangor?
You can ask for: (1) optional maintenance add-on pricing, (2) the price of an upgraded hybrid inverter instead of a string inverter, (3) a clear list of what is included and excluded.
What questions should I ask a solar installer before signing?
Ask: (1) Exact panel brand and model (not just "550W panel"), (2) SEDA RPVSP registration number, (3) Payment schedule breakdown, (4) Who handles the Solar ATAP application, (5) Warranty claim process, (6) How inverter faults are handled, (7) What's included/excluded in quote (scaffolding, earthing, permits).
Conclusion: Why Choose Trexon Energy in Selangor
Trexon Energy is a SEDA-registered installer for homeowners in Selangor. Our 30-year panel performance, 10-year inverter and 5-year workmanship warranties and transparent package pricing are set out in writing before you book. If you are also looking for coverage in the capital, see why Trexon is a SEDA-registered installer in KL — the evaluation criteria and red flags are similar but the installer landscape differs.
We handle the site survey, the Solar ATAP application, TNB commissioning and optional maintenance add-ons. You get a turnkey system backed by manufacturer warranties and our workmanship warranty. See our full pricing page for transparent package details.
Ready to go solar with Trexon in Selangor? Book the RM100 site visit (credited in full when you proceed) or calculate your savings. We provide itemised written quotations before you book.
Get your free quote. For location-specific pricing, installer availability, and Selangor ATAP capacity status, visit our Selangor solar installation page.