Selecting the right solar panel optimiser is crucial for system performance, safety, and long-term reliability.
Tigo’s TS4-A-O optimiser has earned its reputation as a trusted choice for installers worldwide, delivering module-level monitoring, optimisation, and rapid shutdown in residential and commercial projects.
Yet, with solar modules now exceeding 700W, compatibility and future-proofing have become essential. The TS4-X-O is Tigo’s next-generation optimiser, purpose-built to meet the demands of today’s high-power panels.
In this article, we’ll outline the key differences between the TS4-A-O and TS4-X-O, so you can determine which optimiser is the right fit for your next solar installation.
Quick Electrical Specs Comparison
| Spec | TS4-A-O | TS4-X-O |
|---|---|---|
| Max Output Power (Pmax) | 700 W | 800 W |
| Max Input Current (Imp/ISC) | 15 A / 20 A | 20 A / 25 A |
| Max Output Current | 15 A | 20 A |
| Maximum Input Voltage | 80 V | 80 V |
| Input Voltage Range (VMP) | 16 V – 80 V | 12 V – 80 V |
| Max System Voltage (UL/IEC) | 1000 V / 1500 V | 1000 V / 1500 V |
| Maximum Efficiency | 99.6% | 99.6% |
| Connections | MC4 / EVO2 | MC4 / EVO2 |
| Communications | Wireless (CCA + TAP) | Wireless (CCA + TAP) and PLC (RSS Transmitter) for Multi-Factor Rapid Shutdown |
| Rapid Shutdown | Yes (UL 1741 PVRSE/PVRSS) | Yes (UL 1741 PVRSE/PVRSS) |
| Operating Temperature Range | -40 to 70 °C | -40 to 85 °C |
| Max Elevation | 2000 m | 3000 m |
| Dimensions & Weight | 139.7 × 138.4 × 22.9 mm / 520 g | 139.7 × 138.4 × 22.9 mm / 520 g |
| Warranty | 25 years | 25 years |
| Outdoor IP Rating | IP68 | IP68 |
Data correct as of 25/03/2025
When to Use Tigo TS4-X-O Optimiser
The TS4-X-O delivers the best results when module specifications push beyond the limits of standard optimisers. Choose it when your installations involve:
- High-power modules (700–800W) – for example, the 710W (PLM-710DH2N-132) ensuring full power output without restriction.
- High-current modules (even for certain lower Wp modules) – as modules get bigger, depending on their configuration, they may still exceed current ratings of the TS4-A-O – even some lower-Wp modules, such as the 620W (PLM-620DH8NH-132) can exceed the TS4-A-O’s current rating (15.19A Imp vs 15A limit). The TS4-X-O supports up to 20A Imp and 25A Isc.
- Challenging site conditions – including higher ambient temperatures or high-altitude sites (up to 3000m)
- Support for power-line communication (PLC) – The TS4-X-O uses Multi-Factor Rapid Shutdown (MFRS) with both wireless and PLC communication for added safety.
By choosing the TS4-X-O for residential or commercial projects, you prevent power bottlenecks and ensure your optimiser keeps pace with today’s high-performance solar panels.
When the TS4-A-O is Still a Great Fit
The TS4-A-O continues to serve as a reliable, cost=effective optimiser for standard PV projects. Use it when:
- Modules fall under 15A Imp / 20A Isc – ensuring full compatibility without exceeding limits.
- You don’t require PLC communication (only wireless using TAP/CCA)
Installers still rely on TS4-A-O for mainstream systems thanks to its proven performance long-standing track record in the field.
Final Take
The TS4-X-O doesn’t replace the TS4-A-O – it expands your toolbox. As demand for larger, higher-power modules grows, the TS4-X-O ensures your MLPE keeps pace.
Both optimisers deliver:
- Module-level optimisation for maximum energy yield
- Full monitoring through Tigo’s Energy Intelligence platform, with exclusive Reclaimed Energy insights that quantify real optimisation gains
- Certified rapid shutdown compliant with US standards
- Seamless inverter compatibility across more than 50 brands
- 25-year warranty for long-term peace of mind
We’ve partnered with Tigo since 2016.
