Configuration:

Inverter

1 x RCT-AXMX2-8K48V

• Main CPU firmware version: 54.01
• Second CPU Firmware Version: 22.11

Batteries

2  x Pylontech US3000C 3.5KWH

MPPT

6 x  CANADIAN SOLAR 595W PANEL (Series)

 

Background:

Brand new Inverter, new panels and batteries.

Inverter was only commissioned after installation was done and verified for correct wiring and voltages.

Problem:

The Inverter does not recognise that the PV array is connected to PV1 or PV2.

Testing done:

• Check for input voltage on inverter PCB, connection between external connectors and board and voltage was given of +/- 230V DC
• Tested with 3 panels in series to see if input voltage is too high, no luck.
• I double checked that the array input voltage(Vmp)  is in the range of specifications.
• Max Array Ampere at STC @ 17.15 AMP => inverter rated at 18 amp (Max)

Any suggestions on what else can be done?

CSI-Datasheet-HiKu7_CS7L-MS_v1-3_EN_580-600-4.pdf

8 hours ago, RoelofZA said:

Check for input voltage on inverter PCB, connection between external connectors and board and voltage was given of +/- 230V DC

I assume that you checked for correct polarity. I also assume that it detects the battery and/or AC input.

It looks like its Solar Charge Controller is Dead On Arrival.

Though you might first check for leakage to earth on the PV inputs (NOT while the inverter is running and connected to panels). But that usually doesn't stop the inverter from recognising or using the PV input; it usually results in tripped breakers and/or an excessive bus voltage fault code (F08 from memory).

@Coulomb thank you for the reply

I spoke to Rectron support this morning after I posted. They advised that I needed to return the unit because of a failure.

They also said that it is very odd behaviour.

Inserting that, I do not get an F08 error or tripped breakers.

I’ll post an update when I get a fault report after the repair.