Multiplus II 48/8000 - Random "OVERLOAD WARNING" messages

Q&A and troubleshooting
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Also, to be clear on my issue. This 8KV MP II has never turned off due to an overload There are no devices with inrush currents connected to AC-1 or AC-2 except for a washer and a Fridge. Findings that i can confirm with at least 95% surety

  • No shutdown has every occurred

  • There are no high DC Ripple or low battery alarms (except 1 which happened due to a very low SOC and the BMS turning off)

  • The Warnings are just that “Overload Warnings”

  • Alarms only occur with Grid connected and ESS enabled (not once with grid disconnected)

  • The alarms are persistent, in most cases can easily exceed 10 in a single day

  • All alarms occur only during the day and usually with around 2KW or more PV power being generated (have had 1 alarm 22:00 at night)

  • My alarm events will last around 20 to 40 seconds (the same as an actual overload)

  • Hardly ever does the Overload LED light up (I have a camera focused and recording on the MP II and the VRM screen to monitor status and behaviour)

  • I Have managed to usefully recreate numerous alarms with a weed-eater / bushwhacker (800W). When power from “AC LOADS” and “Grid” power. In other words, the bushwhacker is not powered by the MP II from AC-1-Out or AC-2-Out. (Yes, the grid power is not very clean)

  • I am very confident that it something to do with the grid power, but the question remains why an overload warning?

The unit was replaced 3 days ago with a test 5KVA MP II (it is obviously premature, but not a single alarm yet). The same 5KVA was installed for around 2 weeks while the 8KVA MP II was in for testing in mid-2024, it also did not generate any alarms then. I have been in contact with the Operations Manager at my supplier who has turned out to be much more helpful. He has arranged a test unit 10KVA Quatro for testing as well.

This is what a typical alarm looks like. 75% of these alarms can be traced back to when the bushwhacker or other heavy equipment was powered from “AC LOADS” or “GRID” side.

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I will report back with more info once both units have been tested at the same site. Thanks Guy for assisting
Just as a side note why is the word “L0an” not allowed on the forums?

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That’s what I thought,

So I think the solution is to suppress those warnings as described here by adding a 60 second time delay before they are activated - Overload L1 warnings for Furnace Blower start remedies - #10 by pwfarnell

That word associated with borrow is commonly used by spammers, so it’s on a list to automatically block.

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