multiplus 24v 1600va switch off /on with no warning or alarm

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tom-botha asked May 21, '23

multiplus 24v 1600va switch off /on with no warning or alarm

Hi all,

After replacing my GEL hybrid E-Guard batteries that only lasted 5 months with a Hubble AM4, my inverter inexplicably switches off and then on again. The lights flicker rapidly, as observed on the graph with a one-minute sampling rate. This issue occurs randomly, with intervals ranging from 9 to 36 hours. It never occurred during the 5 months when I was using the gel batteries.

The battery is not connected to a CAN bus system, as I utilise a Raspberry Pi for monitoring and a smart shunt for the state of charge (SOC).

Does anyone have any ideas why this is happening now?

MultiPlus Quattro Inverter Charger

off-on.png (26.0 KiB)

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Matthias Lange - DE ♦ commented · May 21, 2023 at 11:54 AM

Look at the battery voltage/current diagram at that moment.

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tom-botha Matthias Lange - DE ♦ commented · May 21, 2023 at 04:21 PM

Hi Matthias,

Thanks for the reply. It looks like the problem lies with the battery. If you zoom in on the VRM recording with a 1-minute sampling rate, I believe that with a fast recorder, you will see the battery voltage dropping to zero. However, I'm wondering why the inverter restarts and what the solution could be. What if I modify the repeated absorption time and absorption time settings in such a way that the charger remains in the absorption mode? The battery label states that the equalized and float voltage should both be 29V.

I am already well over my budget and I do not want to spend another cent on the system.

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off-on-inv.png (50.3 KiB)

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Answer 1 · 2023-05-21T11:54:39Z

nickdb answered · May 21, 2023 at 11:54 AM

It is most likely a battery/BMS issue.

You can get CAN connectivity on a PI, which would allow the battery to manage the system properly, something that is helpful for the PACE BMS they use which has been known to be temperamental.

VRM will not capture transients, grafana is better for this, so it is not always possible to visualise what is actually going on.

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tom-botha commented · May 21, 2023 at 03:06 PM

Hi Nickdb,

Thank you for the reply. I am not familiar with Grafana. Do you install it on the Pi, and how do you connect the signals you want to monitor?

Hubble claims that connecting their CAN-bus to a third-party device will void the warranty. That is why I do not want to connect it via a CAN HAT.

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Answer 2 · 2023-05-25T11:08:49Z

tom-botha answered · May 25, 2023 at 11:08 AM

I send the battery back still waiting for my refund after 15% admin charge. Fed-up for the blame shifting between to different makes, try to sell everything then it will be Sunsynk Inverter with a Sunsynk battery,

Thanks all for try helping me.

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