Tigo TS4-A-M is a legacy add-on MLPE device that provided module-level monitoring without optimization.

Tigo TS4-A-O is an add-on MLPE optimizer that provides module-level optimization, monitoring, and rapid shutdown for PV modules up to 725 W.

Tigo TS4-A-S is an add-on MLPE device that provides module-level monitoring and rapid shutdown for PV modules up to 725 W, without optimization.

TS4 is Tigo's Flex MLPE platform, with TS4-A and TS4-X families for module-level optimization, monitoring, and rapid shutdown use cases.

TS4-X is Tigo's high-wattage Flex MLPE series for module-level optimization, monitoring, and rapid shutdown functions on compatible PV modules.

Tigo TS4-X-F is a dedicated rapid shutdown MLPE device for high-wattage and high-current PV modules up to 800 W, 25 A Isc, and 20 A Imp.

Tigo TS4-X-O is an MLPE optimizer for high-power PV modules that provides optimization, module-level monitoring, and rapid shutdown for modules up to 800 W, 25 A Isc, and 20 A Imp.

Tigo TS4-X-S is an MLPE safety and monitoring device for high-wattage modules up to 800 W, 25 A Isc, and 20 A Imp; it provides module-level monitoring and rapid shutdown without optimization.

High-resolution module-level telemetry; it supports system visibility, commissioning, troubleshooting, or ongoing performance review.

Underwriter's Laboratory (UL) is a global third-party safety science organization certifying many electronic devices.

PV system without intentional grounding; in solar projects it provides useful context for design, installation, service, or ownership.

Avoid using “unit” when a more precise term such as module, MLPE, inverter, battery, or device would be clearer.

Utility rate escalation is the increase in electricity prices over time, often modeled as an annual percentage in solar savings calculations.

A virtual power plant is a network of distributed energy resources, such as batteries or solar systems, coordinated to provide grid services.

Voltage at maximum power point; in PV design it helps verify equipment ratings, wiring, and safe operating limits.

The voltage of a PV module when a load is applied to the string, i.e., the PV inverter is producing power.

Open circuit voltage of module; in PV design it helps verify equipment ratings, wiring, and safe operating limits.

The voltage of a PV module when no load is applied, i.e., the PV inverter is not producing.

Weight is the mass of a device or component, important for shipping, handling, mounting, and structural planning.

TS4 → TAP wireless communication network; it affects how stored energy is charged, discharged, backed up, or valued.