Inverter Compatibility

There are two places to look for Tigo/inverter compatibility information:

Inverter Compliance Letters

These are letters of understanding between Tigo and inverter vendors.  They must be interpreted individually.  If you have questions, please let us know.

UL - PVRSS Certified Inverters

This is a list of inverters that are UL PVRSS listed for use with the various Tigo TS4 products.  Tigo tests TS4 products with UL and inverter vendors, the results are on this page.

There is ongoing testing between Tigo, UL and inverter vendors and the latest results are posted here. As of 2020, new results are being added to this list every 6-8 weeks.

Solar Module Compatibility

For solar modules, you should check:

• Cable Length: particularly for landscape orientation and always for split j-box modules with short leads.  For the TS4-A-2F in particular, the cabling is a bit more complicated.  If you need help, reach out to us at se@tigoenergy.com.
• Connector Match: The NEC (section 699.33) requires that all mating connectors match in both type and manufacturer.  There are some good safety reasons for this.  Our standard Tigo TS4 product uses MC4 connectors manufactured by Stäubli.  Mating these connectors with anything else can result in your system failing inspection.
• Electrical Characteristics: Verify that the max power, voltage and current are within limits for the TS4 unit you want to use.  You can find these values on the TS4 data sheets:

Tigo Data Sheets - UL (USA)

Tigo Data Sheets - Global (TÜV)

Voltage should be de-rated. The temperature corrected max voltage of the module should be less than or equal to the max voltage on the TS4 data sheet.  As long as the Isc at STC is less than or equal to the max current rating of the TS4, the module is compatible in current.

With bifacial modules, you should use the MAX bifacial boost figures.  These should also be de-rated in voltage as described above.  If the data sheet does not clearly show max current with bifacial boost, a worst case 20% boost should be used.

• Frame fit: there are modules on the market that are too thin to accommodate the TS4 unit on the frame.  See below.  The dimensions below are for the TS4-A-X ONLY, not the TS4-R-X.

NOTE: Metal Clip Engagement Length depends on the Frame Thickness, Contact Tigo if Metal Clip Engagement Length is less than specified above.

The minimum dimensions in the illustration above must be observed for the TS4-A-X products to be mounted to the frame.  If the frame is too shallow to accommodate the TS4-A-X units, they can be mounted to racking or elsewhere with screws.  See:  "How do I remove the module clips from the TS4-A?"

Questions?

If you are in doubt, send a data sheet for the inverter or module to se@tigoenergy.com and we can check it for you.