Tigo’s TS4-A-O has become a trusted go-to optimiser for installers worldwide, enabling module-level monitoring, optimisation, and rapid shutdown. But as PV module power continues its relentless climb, with large-format commercial panels now exceeding 700W, installers need an optimiser that can keep up. Enter the TS4-X-O: a more powerful solution purpose-built for the latest high-performance solar modules.
Let’s break down the key differences and explore when it makes sense to choose each model.
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 / 15 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 | 16 V – 80 V |
| Max System Voltage (IEC/UL) | 1000 V / 1500 V | 1500 V |
| Maximum Efficiency | 99.6% | 99.6% |
| Connections | MC4 / EVO2 | MC4 / EVO2 |
| Communications | Wireless (CCA + TAP) | Wireless (CCA + TAP) and/or PLC (RSS Transmitter) |
| Rapid Shutdown | Yes (UL 1741 PVRSE/PVRSS) | Yes (UL 1741 PVRSE/PVRSS) |
| Operating Temperature Range | -40 to 70 °C | -40 to 70 °C |
| Max Elevation | 2000 m | 2000 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 the TS4-X-O
Choose the TS4-X-O when your project includes:
- High-power modules (700–800W), such as 710W (PLM-710DH2N-132) to ensure the module power output is not limited.
- 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 if they are under the max power output of the optimisers, such as the 620W (PLM-620DH8NH-132) which is within the maximum power output of the A-O, yet has an Imp of 15.19A, exceeding the A-O’s limit, whereas the TS4-X-O allows up to 20A Imp and 25A Isc.
- Higher ambient temperatures or high-altitude sites (up to 3000m)
- Support for power-line communication (PLC) via Tigo RSS transmitter
The TS4-X-O is ideal for both residential and commercial systems pushing the edge of module specs – helping avoid power bottlenecks and ensuring optimisers aren’t the weak point in the system design.
When the TS4-A-O is Still a Great Fit
For most standard installations, the TS4-A-O remains an excellent and cost-effective option. Use it when:
- Your modules are under 15A Imp / 20A Isc
- You don’t require PLC communication (only wireless using TAP/CCA)
It’s still perfect for mainstream residential installs and has a long track record of field-proven reliability.
Final Take
The TS4-X-O doesn’t replace the TS4-A-O – it expands your toolbox. With growing demand for larger, higher-power modules, the TS4-X-O ensures that your MLPE can keep up.
Both models deliver:
- Module-level optimisation
- Full monitoring through Tigo’s Energy Intelligence platform
- Certified rapid shutdown (to US standards)
- Seamless compatibility with the most common inverter brands (over 50)
- 25-year warranty
We’ve partnered with Tigo since 2016.
