I have 2 multiplus 24/1600 ,, i used just one of them firstly , then i connect the second one with first in parallel , i upgrade them to the last softeare 473 , , programmed the both and everything seems good , in ve bus thr check give me ok , no errors , all that the network grid was on , after grid off , i noticed thats one inverter make big noise for secondes then back normally , and the invertes feed back electricity to Ac-in , i disconnected the inverters and make stand alone again and seem problem , I downgraded firmware and same problem , my main electricity table separated very well , i hope anyone find solution for me
Please be helpful, i have no local dealer im my region for VE , and everything stop and airline stop from Covid19