First off, the charged voltage on the shunt must be 0.1 to 0.2V lower than absorption on the mppt so set this to 14.0 or 14.1V.
Lithium batteries are supplied only about 50% full so with 400Ah with a 50A MPPT this is going to take many hours to get them charged. You do not state what solar power you have or what charge current you are seeing. 13.2V is not a full lithium battery, that would be 13.5 to 13.6V. Float at 13.5V holds the battery just below full. I believe you just need to keep charging until the charging voltage gets to 14.2V. If you are using power at the same time this could take several days. Lithium will stay in bulk until the last 10 to 15 minutes unlike lead acid.
i think i was getting over anxious , my first delve into the world of lithium!!! , these were not new batteries and had been stood for sometime unused. Late on today , measured off load, the batteries had reached 13.44v which i believe is not far off full charge, so hopefully in the next few days all will be well . i am seeing full charge current of 50A when in full sun however power is also been used other than for battery charging.
having spent considerable time changings settings etc i concluded likely cell inbalance , following a guide on youtube i opened the battery ready to sort this …
insidethe “BATTERY” i found nothing like on youtube
FAKE
cheap nasty unbranded BMS
floating in mid air temperature sensor (only 1 should be 2)
and the worse was a pack of lithium polymer batteries !!!
I am sorry to hear this. I always suggest that you buy lithium batteries with Bluetooth as a minimum so at least you know the cell voltages. I know that this would not have prevented a fake battery being supplied, but is useful for future replacement.
Similar but different. To someone who didn’t have any reference you wouldn’t know.
But this is a topic that’s really beyond the scope of the community.
