L1 Overload out of sync with VRM readings

DIY
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1

I’m experiencing multiple overload L1 warnings from my two MP2 5000 in parallel and, when I compare the recorded time of the events on my VRM, they never seem to match the point of maximum current being drawn by the system although there seems to be a high demand some 30minutes earlier.

This seems to be a regular pattern so every time the peak is reached around thirty minutes later a warning gets logged.

In any case, the max used amperage never exceeds the 80A which equates to 4240W and the two Multiplus 5000 should easily provide that and plenty more.

How can I check the source/nature of the problem if the reported time is never even close to the max absorption time?

2

An overload on a parrallel system can happen when the load is not being shared between the to units. Or one is running hotter than the other so derating sooner.

3

Thanks, I am aware of that however this used to happen even before when I only had one MP2.

I tried to measure the amperage of the two inverters’ incoming DC but it was difficult to catch the correct timing.
I wonder if there is such a tool that can be used to monitor the currents over a set period independently from the Victron software so that I can then compare the two

4

Reading from other forums I see that an Eyedro adapter can be used in conjunction with a mobile phone but it only reads voltages from 100 to 240v

5

You could use victron shunts to do so.
There is a way with node red.

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6

Thanks, I would need to disconnect or cut the cable to do that, I need to be able to put an open clamp around the 70mm cable, unfortunately.

The AC side is not a problem, it’s the DC run that I want to monitor.

7

Perhaps this is worthy of a fresh post since I have discovered a major discrepancy between the DC voltage & Amperge readings from the Lynx and those from the Multi.

That would explain the sporadic and irregular warnings.

8

There is no shunt in the inverters themselves. The AC side has the measurements for amps. So check your AC wiring, if they can supply loads evenly then also the DC wont be able to since the demands are not equal.
Longer and smaller gauge runs are better for balance.

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9

I have checked the AC lines and they fluctuate continuously by very small margins however it isn’t easy to catch the right timing as it only happens once a day, sometimes two and then nothing for two days. It does not necessarily happen at the highest demand so it’s difficult to recreate the scenario