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2 x Axpert MKSII in Prallel Issue


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Ok, now wtf can be causing this. I have 2 x MksII connected parallel. One inverterfails with 05 error. When I remove the input to the inverter it shows the same input vac as the output. Wires removed directly on the inverter input. If I use it as a single inverter it works perfectly. They were both bought together and serial numbers follow. Both running same firmware version.

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3 hours ago, Cozy35 said:

2 x MksII connected parallel. One inverter fails with 05 error.

Do they both have setting 28 set to PAL? Don't forget to have the inverter switch off when changing this setting. If not, it has 230 V applied to its output when it tries to generate power, so it sees this as a short circuit (which it is in a way, just short circuit to another voltage source, rather than short between its own outputs.

3 hours ago, Cozy35 said:

When I remove the input to the inverter it shows the same input vac as the output.

That's pretty weird. I have no good ideas. Perhaps leakage between AC-in and AC-out? It's hard to imagine you'd read the exact same voltage, though.

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20 minutes ago, Coulomb said:

Do they both have setting 28 set to PAL? Don't forget to have the inverter switch off when changing this setting. If not, it has 230 V applied to its output when it tries to generate power, so it sees this as a short circuit (which it is in a way, just short circuit to another voltage source, rather than short between its own outputs.

That's pretty weird. I have no good ideas. Perhaps leakage between AC-in and AC-out? It's hard to imagine you'd read the exact same voltage, though.

I have just swapped the faulty inverter with a replacement and all is well. The inverter is definitely faulty, strange issue at that. It will go back for warranty exchange.

I have installed quite allot of these in parallel and 3 Phase configurations in both solar and backup power scenarios but this is a first for me. I suspect that the safety relay switching the IP AC got stuck and feeding the OP AC via the IP. Not too sure of this is possible?

What I also noticed is that when setting it back to SIG as  a single unit, there is no 220VAC on the IP as when in Master Mode, but.... in the SIG mode, there is 220VAC between the earth and the Natural as well as earth and live on the IP, but zero between the Live & Neutral.

Very strange indeed.

 

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