Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2232
| Posted: 06:21am 12 Jan 2024 |
Small update, I just went over the graphs for the past 24 hours and with the settings I'm using it's doing everything correctly. The individual battery banks are switching on/off correctly, when they do switch on, their charge currents are almost identical.
The External battery capacity meters are tracking within 1% for each bank over that charge - discharge and recharge cycle. They matched the BMS SOC right up until each BMS OV trip set its SOC to 100%. The external SOC indicators were at 97%, they reached 99% after a few cycles at 28A each when the MOS charge switches turned on due some small discharges with falling Solar voltage, been raining most of the day here, Active balancers ran for a few cycles to trim a 38mv difference.
This difference is actually getting less with each cycle as these pack of two and three year old mismatched cells seem to be settling in nicely.
Our nightly power usage is very consistent, with two battery banks - 340Ah - the SOC is always around 75% in the morning in each battery before the Solar kicks in. Obviously by being in parallel they are virtually forced to track on discharge.
.
Edited 2024-01-12 16:22 by KeepIS