Good evening I would like to ask a question if it is easy for a problem I have with two inverters voltronic mks ii 5kw 48v parallel 

I get the error 72 and my power goes out I have 8 batteries 12v 245ah tab motion paste and 36 photovoltaic panels of 160 watts 48v bp solar  With a total power of 5,760 panels Please if you know because I saw a similar video of yours with inverter mpp give me a solution to my problem The error from what I read says difference in output voltage I do a restart and the next day again the same If you can help I have this problem for a year and I can't find a solution thank you ? 

On 2020/09/21 at 11:37 PM, vasilhs said:

The error from what I read says difference in output voltage

? My parallel manual says fault code 72 means "The output current of each inverter is different." So this is a current sharing issue.

As the parallel manual says, check the current sharing cables (the wires can become loose, or the connectors in their sockets), and the AC output wiring and associated breakers. It's possible that you have a loose connection on one of the inverters (the one with the lower output current).

Finally, it's possible that the current measurement is wrong, and the inverters are sharing current properly. This would indicate a hardware fault. But wiring problems are far more likely.

Good evening and again I have checked all their contacts very carefully we have tightened them quite well and the problem usually remains the mistake it makes when charging the batteries what else can it be now ???

Edited October 9, 20205 yr by vasilhs

The only difference I notice for a few seconds is from the photovoltaics to the inverters in terms of voltage difference based on their screens but at their output the voltages are the same with some very small differences for seconds when I have a load on it does not work out usually small load or no load and at the same time to only then error 72 appears 

Edited October 9, 20205 yr by vasilhs

Perhaps you could check the logs (e.g. from Watchpower) leading up to the fault code 72. Make sure that fault recording is on. Then find out whether the two inverters' output power are nearly the same (they should agree within about 50 W).

I have also checked this Code f error leads there their voltage is also below 50w the difference that is you told me to ask you this but when I take out the solar energy in one of the machines the error does not appear again or when they have no solar energy again what I noticed does not appear is that when I put the solar energy in both machines then the error 72 appears again now maybe you can help me what could be wrong ???

On 2020/09/22 at 5:12 PM, Coulomb said:

? My parallel manual says fault code 72 means "The output current of each inverter is different." So this is a current sharing issue.

As the parallel manual says, check the current sharing cables (the wires can become loose, or the connectors in their sockets), and the AC output wiring and associated breakers. It's possible that you have a loose connection on one of the inverters (the one with the lower output current).

Finally, it's possible that the current measurement is wrong, and the inverters are sharing current properly. This would indicate a hardware fault. But wiring problems are far more likely.

one inverter the second i.e. the slave who had the error problem 72 suddenly stopped showing the error and now has no output ac can you tell me now what is happening?

Actually, on re-reading your second last post (assuming that was you), I'm wondering if perhaps you have panels wired to more than one inverter's PV inputs. The PV inputs on some models are not isolated from the mains, and current might be diverting via the panels. This would not be doing any good for the panels, the wiring, or the inverter electronics. Each inverter must have its own panels, and there must be no connection between the PV inputs.

Regardless of the cause, it sounds that one inverter has had something burn out now.