April 11, 20224 yr Hi PowerForum Users, Looking for some assistance into a problem being experienced in a single phase parallel Axpert power system. 3 x Axpert 5kVA/4kW inverters setup in parallel. We have the communication cables and current sharing cables installed, and have tried to ensure that the AC input cables and AC output cables are equal length. While the Axpert inverters are in Grid mode, their respective load power can differ quite significantly – to the extent that the system has been tripping one of the inverters recently. However, while the inverters are in SBU mode, the load is shared very equally across all three inverters and an overload event has not been experienced. Here is a screenshot of the different load being observed by each inverter while in Grid mode: Looking for any insight into how to remedy the problem. Thanks in advance, Nicholas
April 11, 20224 yr What does the wiring look like on the load side. All the Phases to 1 common point and them feeding all the loads?
April 11, 20224 yr If you swop #1 and #3 around is it still the one in #3 position that carries most of the load?
April 11, 20224 yr Since they share well in battery mode, I'd say that the output cabling is fine. Since they don't share in grid mode, which for your models means bypass mode, it looks like the problem is with the input wiring, or the internals of at least two machines (e.g. high resistance relay contacts, loose wires or terminals, etc). I think it could possibly be some sort of neutral or earth weirdness, but I can't put my finger on it right now. When in grid mode with a significant load, it would be worth checking that the voltage at the three AC-in terminals is very similar. Edited April 11, 20224 yr by Coulomb
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