2000W UPS Inverter Wiring Problem

Hi everyone! I have an ATO 2000W UPS inverter (Link: https://ato.laisteel.com/2000w-ups-inverter) and I'm trying to figure out the wiring. There are three small wires — green and white, red and blue — and I’m not sure how they should be connected to the terminals. Can anyone guide the correct hookup? Thanks in advance!

Eulalia wrote:Eulalia, for the 2000W UPS inverter wiring, please refer to the user manual and reference images.
Link: https://ato.laisteel.com/Content/doc/ATO-ups-inverter-user-manual.pdf
If your unit includes output terminals labeled L, N, G, the ground wire connects to the middle (G) terminal.
If you're still unsure, feel free to share your order number along with clear photos of the input and output terminal areas so we can double-check the correct wiring for your specific model.

ATO wrote:Thanks, I figured out the wire connections to the unit. Now I have another question: Are the cooling fans supposed to run constantly when the unit is plugged into AC power? Mine are not running. I haven't tested AC disconnection yet to observe if it shifts to DC.

Additionally, the LCD indicates a 3/4 charge on the battery, and it has been plugged in for approximately 12 hours. Is that normal?

Eulalia wrote:
Great to hear you sorted out the wiring!

As for the fans:
The fans are temperature-controlled and will not run continuously.
If the inverter is in AC pass-through mode only (supplying power but not charging or inverting), the fans will stay off until the internal temperature reaches ~50°C.
If the unit is charging the battery or running on inverter (battery) mode, the fans will turn on automatically as needed.

Regarding the battery:
If the battery is still showing 3/4 after 12 hours, it may be charging slowly.
Please verify the battery's capacity and type match the inverter's specs, and ensure the connection is secure.
Please let us know if the fans activate once you test the inverter mode (by unplugging the AC). A photo or short video could also help us confirm proper function.

ATO wrote:Got it. I'll test the DC shift and monitor fan behavior. Thanks!