External Load switching Off and On

[Harold]

Hello Dacian and all.

When my battery is ending to charge, my external load (DC/AC inverter) is switching Off and On repeatedly.

EXTIO3 is set as type 4, (15%) and works as intended when battery is low SoC.

On the video provided, you can hear the fan of the inverter switching On and Off. Notice that when EXTIO3 is switching, the inverter needs a delay to react, so the command on EXTIO3 and the noise of the fan of the inverter are not synchronized.

Another video with cells' voltages

What is going on ? This is very ennoying.

Can you catch something with the video proveded.

[Dacian Todea (electrodacus)]

Harold,

Yes I can see what the problem is in the second video.   You have a bad connection at the cell monitoring wire connected between cell 4+ and 5- so the green sense wire.

You need to fix that connection and problem will go away. Is best if you solder those wires as crimping is not very reliable long term.

[Dacian Todea (electrodacus)]

Here is a screenshot from your video to better see the issue.

Cells 2, 4 and 6 are balanced and you can see cell 2 has very low voltage drop while cell 4 has a huge voltage drop due to bad connection while cell6 is not as good of a connection as at cell 2 but not bad enough to create problems.

That excessive voltage drop on the green wire will show up as subtracted from cell 4 and added to cell 5. This adding to cell 5 results in Over Voltage Lock limit being exceeded thus both charge and loads are disconnected since this is considered an error (not normal operation).