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Hi Hugo, We have the same Yamaha 9.9HT engines on our 37' Easy Catamaran. Had a lot of issues with high voltages 15v+ when both motors are running. Not so bad when the batteries were low and could soak it all up but if they were floating and we had to motor a lot it would send the voltage sky...

Thanks Hugo glad to hear it is all working well for you! So being in parallel you treat it as one bank on a Lifepo4 charge profile? The Lifepo4 just holds the AGM voltage at 13v+? So if the BMS shuts the Lifepo4 off does that mean the AGM will be there to take over? Cheers!