How to Choose the Best Solar Company in Singapore 2026
With over 50 solar companies operating in Singapore, choosing the right installer is as important as choosing the right panels. A poor installation can waste your investment, lead to roof leaks, underperforming systems, and a warranty that is worthless if the company folds. A great installation delivers decades of reliable savings with zero hassle.
This guide gives you the exact framework to evaluate solar companies, the specific questions to ask, and the red flags that separate trustworthy installers from those cutting corners.
The 7 Criteria That Actually Matter
1. Track Record and Installation Volume
Experience matters enormously. Every roof is different, and there is no substitute for having solved hundreds of unique installation challenges. Look for companies with 5+ years in Singapore's market and 200+ completed residential installations.
2. Warranty and After-Sales Coverage
This is the single most important differentiator. Solar panels last 25 to 30 years. The workmanship warranty determines who pays when something goes wrong.
| Coverage Type | Budget Installers | Mid-Range Installers | Premium (e.g., Sunollo) |
|---|---|---|---|
| Panel warranty | 25 years (manufacturer) | 25 years (manufacturer) | 25 years (manufacturer + installer-backed) |
| Inverter warranty | 5 years | 10 years | 10 to 15 years |
| Workmanship warranty | 1 to 2 years | 5 years | 10 to 25 years (SunolloCare) |
| Roof leak guarantee | None or 1 year | 5 years | 25 years |
| Maintenance included | No | First year only | Full 25 years (SunolloCare) |
| System insurance | No | Rarely | Full coverage included |
| Performance monitoring | Basic or none | App-based | 24/7 proactive with alerts |
| Optimisers included | No (extra cost) | Sometimes | Standard on every install |
3. Equipment Quality and Transparency
Insist on knowing exactly what equipment will be installed:
| Component | What to Look For | Red Flag |
|---|---|---|
| Solar panels | Tier-1 brand (LONGi, REC, Jinko, Trina, Canadian Solar, AIKO) | "Our own brand" or unrecognisable name |
| Inverter | Established brand (Huawei, Enphase, SolarEdge, GoodWe, Sungrow) | No-name inverter |
| Optimisers | Included as standard for shading resilience | "Not needed" or extra charge |
| Mounting system | Aluminium rails with stainless steel hardware | Galvanised steel (rusts in SG humidity) |
| Monitoring | WiFi-connected with app and alerts | "Check the inverter display" |
4. Transparent Pricing
Every quote should be fully itemised. Sunollo's pricing of S$1,000 to S$1,200 per kWp includes everything: panels, optimisers, inverter, mounting, electrical work, permits, monitoring, SunolloCare, and insurance. If a company gives you a lump sum without breakdown, they are hiding something.
5. EMA Licence and Certifications
Every solar installer must hold a valid EMA licence. Verify their licence number on the EMA website. Additional certifications from BCA and Clean Energy bodies demonstrate higher standards.
6. Financial Stability
Your solar system should last 25+ years. If your installer goes out of business in year 5, your workmanship warranty, maintenance, and monitoring all disappear. Look for companies with multiple years of profitability, growing volumes, and strong backing.
7. Customer Reviews and Reputation
Check Google Reviews (minimum 4.5 stars, 50+ reviews), Facebook, HardwareZone forums, and ask for 3 to 5 direct customer references.
10 Red Flags: Signs of a Bad Solar Company
- High-pressure sales tactics — "This price is only available today."
- Refuses to itemise the quote
- Uses unknown panel brands
- Workmanship warranty under 5 years
- No monitoring system included
- No physical office in Singapore
- Quote below S$800 per kWp — market rate is S$1,000 to S$1,200. Anything significantly below means corners are cut.
- Cannot provide local references
- Subcontracts all installation work
- No written contract before starting work
15 Questions to Ask Before Signing
- What specific panel brand and model will you install?
- What inverter brand and model? String, micro, or hybrid?
- Are panel-level optimisers included?
- What is your workmanship warranty period?
- Is ongoing maintenance included? For how long?
- Is the system insured? Against what risks?
- What happens if my system underperforms projections?
- How do you handle roof leaks from installation?
- Can I see your EMA licence number?
- How many residential systems have you installed in Singapore?
- Can I speak to 3 past customers?
- What production do you expect in kWh per year?
- Do you handle all permits (EMA, SP Services, BCA)?
- What monitoring system is included?
- What is your warranty claims process?
Why Sunollo Is Different
Sunollo stands apart from other Singapore solar companies in several key areas:
- Optimisers as standard — Every installation includes panel-level optimisers for maximum energy harvest, even on partially shaded roofs. Most competitors charge S$200 to S$350 per panel extra for this.
- SunolloCare programme — 25-year comprehensive coverage including maintenance, monitoring, insurance, and performance guarantee. No other installer offers this level of protection.
- Full insurance included — Your system is insured against weather damage, theft, fire, and electrical faults. Competitors either do not offer insurance or charge separately.
- Savings guarantee — If your system underperforms Sunollo's projections, you receive a rebate. No other company in Singapore backs their systems with this level of financial commitment.
- Competitive pricing — S$1,000 to S$1,200 per kWp including everything listed above. A 10 kWp system costs S$10,000 to S$12,000 — competitive with budget installers, but with dramatically better coverage and equipment.
- Battery options — Full range of batteries (Tesla, BYD, Huawei, Enphase, Sigenergy) from S$5,000 to S$12,000, all covered under SunolloCare insurance.
How the Top Singapore Solar Companies Compare
| Criteria | Budget Installers | Mid-Range Installers | Sunollo |
|---|---|---|---|
| Price per kWp | S$700 to S$900 | S$900 to S$1,100 | S$1,000 to S$1,200 |
| Panel brands | Budget tier | Tier-1 | Tier-1 premium + optimisers |
| Workmanship warranty | 1 to 2 years | 5 to 10 years | 25 years (SunolloCare) |
| Maintenance included | No | 1 year | 25 years |
| System insurance | No | Rarely | Included |
| Optimisers | No | Extra cost | Included as standard |
| S$0 upfront option | Rarely | Sometimes | Yes (Worry-Free Plan) |
| Savings guarantee | No | No | Yes (rebate if not met) |
| Battery range | Limited | 1 to 2 brands | 5 brands (S$5K–S$12K) |
Subscription vs Purchase
| Factor | Subscription (S$0 Upfront) | Purchase (Cash or Loan) |
|---|---|---|
| Upfront cost | S$0 | S$10,000 to S$24,000 |
| Monthly cost | S$99 to S$199 | S$0 |
| When savings start | Month 1 (guaranteed) | After payback (3 to 4 years) |
| Maintenance | 25 years included | 25 years included (SunolloCare) |
| Insurance | Included | Included |
| Total 25-year savings | Lower but guaranteed | Higher but variable |
| Best for | Risk-averse, no upfront capital | Cash-rich, max long-term ROI |
The Service Gap: What Happens After Installation
Most solar companies are sales-focused. After-sales service is an afterthought. Without proactive monitoring and regular maintenance, common issues go undetected for months or years: panel soiling reducing output by 5 to 15%, intermittent inverter faults, cable degradation from UV and humidity, and mounting corrosion if galvanised steel was used.
Sunollo's SunolloCare closes this gap with quarterly remote performance analysis, bi-annual physical inspection and cleaning, proactive fault detection, 24/7 emergency response, full system insurance, and guaranteed performance with rebate if underperforming.
Frequently Asked Questions
What is the best solar company in Singapore?
For comprehensive 25-year coverage with optimisers, SunolloCare, insurance, and savings guarantee, Sunollo is the premium choice at S$1,000 to S$1,200 per kWp. For price comparison, get 3 to 5 quotes and compare total cost of ownership over 25 years, not just upfront price.
How do I verify a solar company is legitimate?
Verify their EMA licence on the Energy Market Authority website, check ACRA registration at bizfile.gov.sg, read Google Reviews (50+ reviews, 4.5+ stars), and ask for direct references.
Should I go with the cheapest solar installer?
Almost never. The cheapest quote typically means no optimisers, shorter warranties, missing maintenance and insurance, or lower-quality components. Sunollo's S$1,000 to S$1,200 per kWp includes optimisers, SunolloCare, and insurance — making it the best total value over 25 years.
What happens if my solar company goes out of business?
Your panel manufacturer warranty remains valid, but workmanship warranty, maintenance, and monitoring all cease. Sunollo's SunolloCare is backed by insurance to ensure coverage continues.
Is it worth paying more for a premium installer?
Yes. A S$1,000 to S$2,000 premium for optimisers, SunolloCare, and insurance pays for itself with the first service call. Over 25 years, the probability of needing at least one significant repair is virtually 100%.
Get Quotes from the Best Solar Companies
Start your solar journey with a free assessment from Sunollo. Our energy experts will design a custom system with optimisers, provide transparent pricing at S$1,000 to S$1,200 per kWp, and show you exactly what you will save — guaranteed, with full SunolloCare and insurance coverage.
Get Your Free Solar Assessment
Or explore our solar plans and pricing to compare subscription and purchase options.
