rajkumar.b

forgot to ask, can a VFD be used for the motors to check the high inrush current?

Hello There, I am in search for a solar inverter suitable for running two 3HP induction motors (one after another). Currently I have Axpert VM III 5KW, which sometimes restart while starting one motor. The reason I believe due to high inrush current. Upon consulting with some technician, they said these high frequency inverters are not suitable for induction motors. They said to go for any transformer based inverters. I would like to ask you experts here, which type of inverters are best for running induction motors? transformer based low frequency or high frequency? Among these two which one can be used for long duration. Moreover can you suggest few brands and model? Regards, Rajkumar

Thanks for your replies guys. I checked with two multimeters and the readings were same. Fault is in the inverter.

Thanks for your reply and suggestion Coulomb. I'll contact the engineer to fix it. If I don't do anything, then will the inverter cause any trouble in future?

Hello, Greetings from India. I have an offgrid setup at home. 4KW of solar panel installed on roof top. Total 10 solar panels, each panel is of 400w. Voc and Isc of each panel is 45V and 8.4A respectively. Axpert VM 3, 5KW solar inverter with four 200Ah lead-acid batteries. The Axpert VM 3 5KW Solar inverter which is 2 yrs old. Recently due to F09 fault, it was repaired by the service engineer. Where they have completely replaced a faulty board. Now after repair for few days it was working fine then all of sudden since one week the inverter is behaving strangely. Case 1: The inverter was automatically going into "Charge Mode" with out any output for load. This was happening randomly without any fault code or warnings. Even when batteries were fully charged. To solve this, I disconnected and reconnected all the connection such as utility, solar and batteries , restarted the whole system. Case 2: Now after solving the above problem a new problem arisen. The inverter is stopped giving output with fault code F59. As per manual F59 error is due to high PV voltage. The PV voltage in inverter was 480V. I reduced one panel then restarted the inverter. Then the fault was removed. The inverter was working fine for few days. Then same F59 came again. I reduced another panel. Then restarted the inverter. Now it works fine. However before repair I was using the same 10 panels with the inverter it was working fine and great. The question is how and what happened with the inverter due to which, it is behaving strangely. When I checked using a multimeter today, the PV voltage was showing 350V with 8 panel in series but the inverter was showing 402V. From where this extra 50V is coming. With 10 panel in series multimeter shows 435V while the inverter shows 490V. The max PV input voltage for the inverter is 500V. How can I solve this problem? Do I need another repair or what? Please guide me. Any kind of help is highly appreciated. I have attached the inverter settings and pictures for your reference. Regards, Rajkumar