The following are commonly used terms. More information about each can be found in Tigo's Resource Center.


Some inverters are equipped with an Arc-Fault Circuit Interrupter and will shut down for safety if an arc is detected. Required by the 2014 NEC.


Tigo customers can receive email or SMS notifications about performance-related issues and monitoring interruptions. See monitoring package features for more information.

Bypass Diode

Bypass diodes are located inside the junction box of a PV module. They allow current to flow around shaded groups of cells to reduce voltage loss and minimize hot spots in the module. If a bypass diode fails, the module voltage will be reduced while under load, usually by 33%. This can be identified on the Summary page.

Cloud Connect and Cloud Connect Advanced

The CC (legacy product) and CCA (new & improved product) provide communications and data logging for the Tigo system. The optimization and monitoring functions are the same, but the CCA includes some new features like WiFi capability.

Monitoring Dashboard

A display of total energy generated, number of installations, and other environmental info shown to installers and system owners when first logging in to the Tigo monitoring portal. Located above the System Map on the My Installations page. 


When commissioning a Tigo system, the Discovery process is a scan that allows the Cloud Connect to locate and communicate with the optimizers.


A legacy product that is an antenna that connects to the Cloud Connect or Cloud Connect Advanced for wireless communication with the optimizers. See the TAP for new & improved functionality.


Also referred to as a serial number or barcode, the MAC ID is the unique ID number of a piece of Tigo hardware.


Module-Level Power Electronics - a class of devices that includes power optimizers.


A communication protocol for connecting electrical devices. MODBUS-equipped inverters and meters can report data to the CC or CCA.


A "photovoltaic module" is an assembly of solar cells, sometimes also called a solar panel.


Maximum Power Point Tracking. Tigo optimizers work in conjunction with a central inverter to determine the best possible operating conditions at the module level. See the Optimization article for more information.


A general industry term for DC to DC converters designed to maximize the energy yield from a PV system.

Peak Power

Peak power is the nameplate capacity of the modules multiplied by the number of modules in the system.

Power Factory

On the Charts tab of the monitoring portal, this represents the total DC power produced by your system.

Predictive IV

A feature available in the TS4-O and TS4-L covers incorporating MPPTImpedance Matching, and module behavior statistics for the greatest energy yield as well as selective deployment of optimization. 


Tigo systems are equipped with a safety shutdown feature that can be activated locally, remotely, or in some cases, automatically. Formerly known as PV-Safe.


A communication protocol for connecting multiple devices in series. Tigo uses a 4-conductor, twisted pair cable for the connection between the TAP, Gateway, Cloud Connect, or Cloud Connect Advanced.


Received Signal Strength Indication (RSSI) is a measure of wireless signal strength. Higher numbers are better. RSSI values below 70 mean you may need to re-position or add Gateways. See our article on Gateway Placement for best practices.

Selective Deployment

The ability to choose from different features (including optimization) and place them where needed on your PV system. A feature unique to the TS4.

Smart Module

A PV module that comes pre-assembled with Tigo's electronics already installed in the junction box.

Summary Page

The module-level view of power production through the Tigo monitoring portal.

System ID

A record number used to identify a particular Tigo installation.

TAPTigo Access Point (TAP) allows the CCA to communicate wirelessly with any TS4 unit(s) - integrated or retrofitted. TAP replaces the legacy Gateway; is smaller in size; packed with additional features; has a wider range between TS4's; and has increased module capacity. 


Tigo's universal junction box platform with electronics embedded in the J-box cover. The TS4 can be used for residential retrofit.  The full line of TS4 Optimizers includes five different covers.


Voltage at max power. Vmp * Imp = module wattage rating


Open circuit voltage. The voltage of a module when no load is applied. Used when calculating maximum string length. Smart modules with the longer strings feature limit the output voltage so that more modules can be placed in a string.