question

alexch avatar image
alexch asked

Strange behaviour: Battery status

Got my new system running, main components:

MP5000, JK BMS, 10KW Battery Li ION (NOT lifepo4). Excess energy fed to the grid.

From time to time the following happens:

Battery status: nearly full (60v)

PV production low, ca. 500 watts

AC Loads go up to about 2500 W for some seconds only (no big consumer active in the household...). Grid consumption goes up too, of course.

Battery goes down to 51V.

Battery alarm goes on.

Then during about 10 seconds the battery goes up volt by volt back to 60v.

What could be the reason for this?

And: why is there an alarm at 51 volt? I didnt set it anywhere to this point.


Thanks !




battery charging
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1 Answer
Alexandra avatar image
Alexandra answered ·

@AlexCH

Battery is probably disconnecting and the ve bus is reading dc voltage because pv is passing over the dc bus for feedback.

Tray cap your charged voltage in dvcc a bit lower. Or set them permanently lower in settings.

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