Lithium charging question

[gbillman]

Just got out of a 5 week boat yard period during which I kept my fridge and fans running using my 3 400 hour lithium house batteries (1200 ah).* My 1035watt solar panels/midnight sun solar controller were my sole charging source during that period.

I checked my solar controller, xantrex system and battery monitors (on each battery) daily.* *The solar controller generally showed 70 - 85% charge depending on conditions, xantrex generally showed 13.5-14v, and BMs were generally 80-90%.

I figured when I got back in the water and on to shore power, my charger would bring everything back up to near 100%. That has not occurred in the 2 weeks I've been back.

My current states are reflected in these pics of the solar controller (99-100%), xantrex controller (14.2 v) and BMs (89-86%).

Did I screw up the batteries' charge levels while in the yard?* Did they reset somehow to a lower charge state for some reason?*

Thanks for any inputs.

[wholybee]

Most likely your batteries are fully charged, but your battery meters are not setup correctly. The meter needs to be setup with the correct voltage, tail current, and sense time in order for them to reset to 100% when the batteries are indeed at 100%. And from there, each day they don't charge to 100% to reset, they will drift slightly. If setup incorrectly, they will drift all over, and never reset to 100%.

[senormechanico]

They're FULL ! Even a bit over full.
I take my home's 24 volt system to 26.8 and float it at 26.4 with a Midnite Solar 150.


The boat's absorb is 13.8V. Very few aH that can be added between that and 14.2v.


Your BMS is estimating.
Give the batteries a discharge and back up. The chinese thing may resynch itself.
Check your settings as well.