We do not sell renewable energy systems. We compare them.
YourWatts is an independent comparison platform. We do not install renewable energy systems, sell equipment, or receive commissions from manufacturers for rankings. Some product and installer links are affiliate links — we receive a referral fee if you proceed, but this does not affect where a product appears in our rankings.
Data Sources
- Product specifications — solar panels, wind turbines, batteries, inverters, and heat pumps sourced from current manufacturer datasheets. We note the last-verified date on every product page.
- Prices — indicative market estimates based on publicly available installer quotes and wholesale pricing where disclosed. Actual prices vary significantly by country and installer.
- Tier ratings — Bloomberg NEF bankability tier for solar panel manufacturers. Tier 1 = financially bankable, not a direct quality guarantee.
- Incentive data — sourced from IRENA APAC reports, IEA Southeast Asia Energy Outlook, Australia's Clean Energy Regulator and Clean Energy Council, Singapore EMA, Thailand ERC, Indonesia ESDM, Malaysia SEDA, and Philippines DOE. Reviewed quarterly.
- Standards — Australia/New Zealand AS/NZS 5033 for PV array installation, AS/NZS 4777 for inverter grid connection; IEC 61215/61730 globally.
Scoring Criteria
Our "Best for X" badges are assigned based on objective data:
- Highest Efficiency: Highest published efficiency percentage under STC conditions
- Best Value: Lowest price per watt among Tier 1 panels with ≥20% efficiency
- Best Warranty: Longest linear power warranty with ≥90% at year 25
- Best Off-Grid: Largest usable capacity with LFP chemistry and ≥95% round-trip efficiency
Calculator Methodology
- Annual production = system kW × peak sun hours (country-specific from IRENA and national meteorology data) × 365 × 0.78 performance ratio
- Performance ratio of 0.78 accounts for inverter losses, wiring losses, higher temperature derating in tropical climates, and humidity soiling
- Degradation: 0.5%/year (industry standard; some premium panels perform better)
- COâ‚‚ offset: country-specific grid emission factors from IEA and national energy agencies
- Tree equivalence: 21 kg COâ‚‚ absorption per tree per year (IPCC estimate)
Update Cadence
- Product specifications: reviewed when manufacturers release updated datasheets
- Pricing: reviewed monthly
- Incentive data: reviewed quarterly — Australia STC price, Singapore ECIS tariffs, and Thai ERC rates change frequently
Limitations & Disclaimers
All content on YourWatts is informational and should not be used as the sole basis for purchasing decisions. Renewable energy system performance depends on local weather, site conditions, installation quality, and equipment selection. In Australia use a Clean Energy Council (CEC) accredited installer to claim STCs; in Singapore engage an EMA Licensed Electrical Worker. Obtain quotes from qualified installers before purchasing.