Be Cool BC-B2500B Mode D'emploi page 260

If you find that the micro-inverter is not functioning properly after the connection
described above, please connect as follows: Connect one of the micro-inverse to
the Output1 of the product, and the other micro-inverse should either be
disconnected or connected to the solar energy.
*This issue arises from the fact that some of the micro-inverters available on the
market have a common internal reference point. When both micro-inverters are
connected to a battery bank simultaneously, the micro-inverter will function
abnormally.
Tool for removing cables:
Rotate the tool 90°
S. 260