conext mppt 60 150 Off Grid- Drop Voltage

[Shelby95322]

the battery does have voltage 45.6, the warning is from the inverter "CSW4058 00 DC under voltage", when we test the PV voltage with the system on, is not given any voltage from the combiner box but when turn off the battery and system, the PV is giving us 110V, do you have an idea of what the problem is?