Amateur radio transmission causing Multiplus to stop working for Low Battery Alarm

Q&A and troubleshooting
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1

Hi,

I have a 4K5 48V Multiplus II and it is working very well from about two months now.During one of my last ham activity I had a black out after a 100w transmission 21.021 MHz. You can see the (Battery Low) alarms in the log report from VRM console in the picture below. It doesn’t happens on other bands or other 21Mhz frequencies.Of course I can survive this odd behavior, I just would like to know if Victron designers can suggest any solution to this or can find a relation between MP-II internal components and 21Mhz frequencies (or third order frequencies).Thank you in advance

73’ Enzo, iw7dmh

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2

mmmh how ist you battery conected to comunicate.

its can be, that the bms shut down.

have you grounded the mp case ? is the battery grounded ?

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3

Hi, thank a lot for your answer.

Battery is a Seplos Mason 15Kw and communicate with CerboGx-MK2 via a common Ethernet cable.
Maybe I can twist it in some kind of ferrites cores.

4

have you ground the housing of the seplos ? on the front you have a ground point !

when you can test your grounding it must be on a very low resitance best is >1,5 ohm

the second is Solar pannels are grounded ? they can be a big antenna !

5

Yes, all components are grounded, from panel set to Seplos battery.
I have to check resistance value. I never did it.