February 27, 20197 yr Hi guys, I have two Axpert 5KVA units connected in parallel. Each unit has 3 x 3strings of 300W panels. I have 10 x LGchem lithium batteries as storage. Recently I noticed that the one unit was not generating as much power from the PV. I checked all the wiring and fuses of the PV and all is fine. I even swopped the PV inputs to isolate the fault and the low production stays on the one unit. On the display of the suspect unit, I see the PV voltage of around 116V but little or no watts are produced. I assume the MPPT controller is faulty? My neighbor with the single 5KVA Axpert setup is also starting to experience a similar drop in PV power production. Can these units be repaired? I would not like to replace my unit because there are only Gen2 versions available, so I would have to replace both mine because the Gen1 and Gen2 are not compatible.
February 27, 20197 yr 1 hour ago, DarynD said: I assume the MPPT controller is faulty? Once the battery is almost full and the load is low the Master will carry most of it and the slave drops to very little watts. One way to see if the Mppt is still okay is to add a nice big load to the setup when you see this again and there is ample sunshine available, if the MPPT wakes up, you can assume the MPPT is still okay. I have run 2 different voltronic parallel setups at my home over the last 3 plus years and in both cases the slave produced much less than the master.
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