Solar Lattice

Product

CSI-125KTL-GS-E

ID
prod:canadian-solar-125ktl-gs-e
IRI
https://solarlattice.org/kb/prod/canadian-solar-125ktl-gs-e
Status
active
Category
Inverters
Make
canadian-solar
Product level
family

The CSI-125KTL-GS-E is a Canadian Solar three-phase grid-tied inverter. It converts DC power from a PV array into AC power for local loads and for export to the grid. It uses a transformerless design with fan cooling. The enclosure is rated NEMA 4X/IP65 and the display is an LCD. On the DC side it takes up to 1500 V and up to 150 A. It has one MPPT that accepts up to 20 strings through MC4 connectors. On the AC side it connects to a 600 V three-phase grid at 60 Hz and delivers a rated output current of 120 A. The datasheet gives a maximum efficiency of 99.1 percent, an EU efficiency of 98.6 percent and an operating ambient range of -25 to 60 degrees C. It communicates over RS485 or Ethernet and supports over-the-air firmware updates. It is listed to UL 1741, UL 1741 SA, Rule 21, UL 1998, UL 1699B, IEEE 1547, FCC Part 15 and CSA C22.2 107.1. If the OV-BUS alarm appears, the inverter has seen excessive voltage on its internal DC bus. Measure the DC and AC voltages and compare them with the LCD readings. Internal damage or a wire that came loose in shipping may mean the inverter must be replaced.

<!-- review notes

Claims

manufactured_by

c1 drafted · lead Canadian Solar

instance_of

c2 drafted · lead Inverter

Three-phase grid-tied PV inverter, transformerless topology

review note: support check: partial - Passage shows it's a three-phase inverter converting DC to AC feeding the grid, but transformerless topology isn't in this passage.

uses_protocol

c3 drafted · lead RS-485

c4 drafted · lead Ethernet

implements

c5 drafted · lead Remote firmware update

Datasheet lists OTA update as supported

c6 drafted · lead Maximum power point tracking

Single MPPT

certified_to

c7 drafted · lead UL 1741 proposed

c8 drafted · lead UL 1741 SA proposed

c9 drafted · lead CA Rule 21 proposed

Listed including Rule 21 Phase II and III

c10 drafted · lead UL 1998 proposed

c11 verified · fact UL 1699B proposed

verified by: review-workflowverified on: 2026-10-24

c12 verified · fact IEEE 1547 proposed

verified by: review-workflowverified on: 2026-10-24

c13 drafted · lead FCC Part 15 proposed

Class A and B

c14 drafted · lead CSA C22.2 No. 107.1 proposed

max_input_voltage

c15 drafted · lead ≤ 1500 V

Conditions: Maximum DC input voltage

max_input_current

c16 drafted · lead ≤ 150 A

Conditions: Maximum DC input current, inverter has a single MPPT

rated_output_current

c17 drafted · lead nominal 120 A

Conditions: Rated AC output current

nominal_voltage

c18 drafted · lead nominal 600 V

Conditions: Rated grid voltage, three-phase plus PE

frequency

c19 drafted · lead nominal 60 HZ

Conditions: Rated grid frequency

efficiency

c20 drafted · lead nominal 99.1 PERCENT

Conditions: Maximum (peak) efficiency

review note: possible conflict with c21 (same source; check the conditions)

c21 drafted · lead nominal 98.6 PERCENT

Conditions: EU (European weighted) efficiency

review note: possible conflict with c20 (same source; check the conditions)

operating_temperature

c22 verified · fact -25–60 DEG_C

Conditions: Operating ambient temperature range

verified by: review-workflowverified on: 2026-10-24

max_count

c23 drafted · lead ≤ 20 NUM

Conditions: Maximum number of input strings on the single MPPT

Referenced by

Data